JB/T 3355-1998 Centrifugal chiller
time:
2024-08-04 03:51:47
- JB/T 3355-1998
- Abolished
Standard ID:
JB/T 3355-1998
Standard Name:
Centrifugal chiller
Chinese Name:
离心式冷水机组
Standard category:
Machinery Industry Standard (JB)
-
Date of Release:
1998-03-19 -
Date of Implementation:
1998-07-01 -
Date of Expiration:
2002-04-01
Standard ICS number:
Energy and Heat Transfer Engineering >> 27.200 Refrigeration TechnologyChina Standard Classification Number:
Machinery>>General Machinery and Equipment>>J73 Refrigeration Equipment
alternative situation:
JB/T 3355-91; replaced by GB/T 18430.1-2001
Description (Translated English) / downloadSkip to download
Summary:
JB/T 3355-1998 Centrifugal Chiller JB/T3355-1998 Standard Download Decompression Password: www.bzxz.net
Standard contentSome standard content:
ICS27.200
Machinery Industry Standard of the People's Republic of China
JB/T3355—1998
Centrifugal water-chilling packages
Centrifugal water-chilling packages1998-03-19 Issued
Ministry of Machinery Industry of the People's Republic of China
1998-07-01 Implementation
JB/T3355—1998
1 Scope
2 Reference standards
3 Definition
4 Types and basic parameters
5 Technical requirements
6 Test methods
7 Inspection rules
8 Marking, packaging and storage
Appendix A (suggestive appendix) Unit model indication method Appendix B (suggestive appendix) Example of calculation of allowable deviation Appendix C (suggestive appendix) Part load temperature conditions and deviation times
Appendix D (suggestive appendix) Calculation of comprehensive and applied part load performance factors (IPLV and APLV) Appendix E (suggestive appendix) Noise measurement record format and Nomograph 2 for calculation of average sound pressure level
JB/T3355-1998
This standard is a revision of JB/T3355-91 "Centrifugal chillers". This revision adopts two nominal operating conditions, among which the application of specified operating conditions is applicable to units for import and export trade and technology introduction. Appendices A, B, C, D and E of this standard are all suggestive appendices. This standard will replace JB/T3355-91 from the date of entry into force. This standard is proposed and managed by the Refrigeration Equipment Standardization Technical Committee of the Ministry of Machinery Industry. The drafting units of this standard are Chongqing General Industry (Group) Co., Ltd. and Hefei General Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Wu Honglan, Han Shuheng and Ren Jinlu. 1 Scope
Machinery Industry Standard of the People's Republic of China
Centrifugal water-chilling units
Centrifugal water-chilling packages JB/T3355—1998
Replaces JB/T3355—91
This standard specifies the basic requirements for the type, basic parameters, technical requirements, test methods, inspection rules, marking, packaging and storage of centrifugal water-chilling units driven by electric motors (hereinafter referred to as units). This standard applies to units with a cooling capacity of more than 348.8kW for central air conditioning or process chillers. It also applies to units that dissolve chemical additives in water to prevent freezing due to low outdoor temperatures. Units driven by engines (diesel engines or gas engines) or turbine engines (steam turbines or gas turbines) may refer to this standard for implementation. This standard does not apply to units dedicated to drinking water, beverages and industries that do not use water as a coolant. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB755-87
GB1032—85
GB1226—86
GB 1497-85
GB/T 1804—92www.bzxz.net
GB 2537-—81
GB 390691
GB 725187
GB 7373-87
GB 777887
GB 10870—89
GB/T 1330691
GB/T13348—92
GB1350092
GBJ50—83
JB/T4329—1997||t t||JB4330—86
JB/T6411—92
JB/T671993
JB/T6918—93
JB/T7247— 94
Basic technical requirements for rotating electrical machines
Test methods for three-phase asynchronous motors
General pressure gauges
Basic standards for low-voltage electrical appliances
General tolerances Unspecified tolerances for linear dimensions
Turbine oil
3-35 kV AC metal-enclosed switchgear
Low-voltage complete switchgear
Industrial use of difluorochloromethane (F22)
Refrigerant numbering method
Performance test methods for positive displacement chillers
General technical conditions for packaging of electromechanical products
General technical conditions for three-phase asynchronous motors for closed refrigeration compressors Design specifications for industrial circulating cooling water treatment
Positive displacement chillers (heat pumps)
Determination of sound power levels of noise for refrigeration and air-conditioning equipment Axial fans for HVAC
Pressure vessels for refrigeration equipment||tt| |Metal and glass sintered level gauge and sight glass for refrigeration Lithium bromide absorption chiller
Approved by the Ministry of Machinery Industry on March 19, 1998
Engineering Law
Implemented on July 1, 1998
JB/T7659.295
JB/T7659.595
JB/T766695
JB/T7771—95
ZB J73 02—89
ZBJ73025—89
SH 034992
3 Definitions
JB/T3355-1998
Water-cooled condenser for Freon refrigeration device
Freon refrigeration device Finned heat exchanger
Nominal operating conditions for refrigeration and air-conditioning equipment General provisions Pressure and differential pressure controllers for refrigeration
Test methods for unit air conditioners
Model compilation method for refrigeration machines
Refrigeration machine oil
This standard adopts the following definitions.
3.1 Nominal operating condition coefficient of performance (COP)
The ratio obtained by dividing the unit's cooling capacity by the total input electrical power under the nominal operating conditions specified in the standard (see Table 1). 3.2 Application Nominal Condition Performance Coefficient (COP') Under the application nominal conditions specified in the standard (see Table 1, the ratio of the unit's cooling capacity divided by the total input power. 3.3 Integrated Part Load Performance Coefficient (IPLV) Under the nominal conditions specified in the standard (see Table 4), the unit's partial load performance coefficient calculated by the method specified in 5.6.2. 3.4 Application Part Load Performance Coefficient (APLV) Under the nominal conditions specified in the application (see Table 4), the unit's partial load performance coefficient calculated by the method specified in 5.6.2. 4 Type and Basic Parameters
4.1.1 Classification by refrigeration compressor type:
Open type;
Closed type (B).
4.1.2 Classification by condensation side heat exchange method:- Water cooling type:
Air cooling type (F):
Evaporative cooling type
Note: The letters in brackets are the unit type codes. Those without codes are not indicated in the model. 4.2 Model
For the compilation method of the unit model, see Appendix A (suggestive appendix). 4.3 Basic parameters
4 .3.1 Nominal operating conditions
The temperature conditions of the unit's standard nominal operating conditions and application nominal operating conditions shall comply with the provisions of Table 1 in addition to the provisions of JB/T7666. Table 1 Nominal operating conditions specified conditions
Evaporator side
Standard nominal operating conditions
Application nominal operating conditions
Outlet temperature
m/(h·kw)
Water-cooled
Inlet temperature
m/hkw)
Air-cooled
Inlet dry bulb
Evaporative cooling| |tt||Imported wet bulb
Imported dry bulb
Imported wet bulb
4.3.2 Other provisions for nominal working conditions
JB/T3355-1998
a) The fouling coefficient on the water side is 0.086m2:℃/kW, on the air side is 0.043m,℃/kW, and on the refrigerant side is 0m.℃kW; b) The power supply for the compressor motor is three-phase AC, with rated voltages of 380V, 6000V and 10000V respectively, and a rated frequency of 50Hzc) The atmospheric pressure is 101kPa.
4.3.3 Performance coefficient at nominal conditions
The performance coefficient at nominal conditions and the performance coefficient at application part load of the unit shall not be lower than the values in Table 2. Table 2 Performance coefficient
Water-cooled
Air-cooled or
Evaporative cooling
5 Technical requirements
General provisions
≤527
Nominal performance coefficient (COP and COP')
Application part load performance coefficient (APLV)
Nominal performance coefficient (COP and COP)
Application part load performance coefficient (APLV)
>527~1163
The unit shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved through the prescribed procedures or according to the agreement between the user and the manufacturer). 5.2 Composition of complete set of equipment
5.2.1 Compressor motor unit consisting of one or more centrifugal single-stage or multi-stage compressors, equipped with necessary lubrication systema) Motor for closed compressor: Motor and necessary gear transmission mechanism enclosed in refrigerant atmosphere. b) Motor for open compressor: Motor and gear and coupling as necessary. 5.2.2 Condenser: Water-cooled condenser or air-cooled condenser or evaporative cooling condenser. 5.2.3 Evaporator: Refrigerant-water heat exchanger. 5.2.4 Other supporting equipment
5.2.4.1 Regulator and control equipment for adjusting the cooling capacity of the unit and the required cold water temperature. Relevant safety protection or control equipment that meets the requirements of safety regulations: 5.2.4.2
Refrigerant high pressure protection;
Oil pressure too low protection (or bearing temperature high temperature protection);-Main motor abnormal protection:
-Cold water anti-freezing (cold water low temperature, refrigerant low temperature and refrigerant low pressure, etc.) protection: cold water pump interlock or cold water water cut-off or insufficient flow) protection; cooling water pump (or condensing fan or spray water pump) interlock or cooling water water cut-off (or insufficient flow) protection. 5.2.4.3 The electrical operating equipment and related instruments of the unit: motor current limiting equipment;
-Main motor starting equipment;
-Operation panel (indicator light, relay, switch button, time relay, pressure gauge, terminal and necessary wiring, etc.) 5.3 Main accessories of the unit
5.3.1 The main accessories of the unit shall comply with the provisions of the corresponding standards. 5.3.2 The refrigeration compressor shall comply with the provisions of the relevant standards for centrifugal refrigeration compressors. 5.3.3 The matching motors shall comply with the provisions of GB755. Enclosed motors shall comply with the relevant provisions of GB135003
JB/T3355-1998
5.3.4 The pressure vessels, condensers and evaporators of the units shall comply with the provisions of JB/T6917, JB/T7659.2 and JB/T7659.5.
5.3.5 The axial flow general purpose machines of the units shall comply with the provisions of JB/T6411. 5.3.6 The pipeline accessories and safety protection components and devices of the units shall comply with the provisions of the following standards: a) The pressure and differential pressure controllers for refrigeration shall comply with the provisions of JB/T7771: b) The pressure gauges of the units shall comply with the provisions of GB1226: The liquid level gauges and oil sight glasses of the units shall comply with the provisions of JB/T6918. 5.3.7 The refrigeration oil used in the unit shall comply with the provisions of SH0349, and the gearbox oil shall comply with the provisions of GB2537. 5.3.8 The control instrument cabinet and the selected electric control switchgear of the unit shall comply with the relevant provisions of GB1497, GB3906 and GB7251. 5.3.9 The refrigerant used in the unit shall comply with the provisions of GB7373 and other first-class products or above, and the protection of the ozone layer and new refrigerants shall comply with the provisions of relevant standards.
5.4 Air tightness, hydraulic pressure and vacuum test
5.4.1 Air tightness test
When the unit is tested according to method 63.2.1, the pressure on the refrigerant side shall not drop significantly. When using an electronic halogen leak detector, the leakage rate shall be less than 14ga.
5.4.2 Hydraulic test
When the water side of the unit is tested according to method 6.3.2.2, there shall be no abnormal deformation and water leakage in each water system. 5.4.3 Vacuum test
When the refrigerant side of the unit is tested according to method 6.3.23, there shall be no abnormal deformation in all parts of the refrigerant side, and the pressure recovery shall be less than 0.4kPa within 24 hours
5.5 Unit nominal operating performance
When the unit is tested according to method 6.3.3, it shall comply with the following provisions. The calculation and evaluation examples are shown in Appendix B (suggestive appendix): a) The cooling capacity shall not be less than 95% of the nominal value b) The total power consumption shall not be greater than 105% of the nominal value of the unit; c) The unit nominal operating coefficient of performance and the application part load coefficient of performance shall not be less than the values in Table 2; d) The input power of the condenser fan and spray pump of the air-cooled and evaporative cooling units shall not be greater than 110% of the nominal specified value e) The pressure loss of cold water and cooling water shall not be greater than 110% of the nominal specified value. 5.6 Scope of use and partial load conditions of the unit 5.6.1 Scope of use
The user can negotiate with the manufacturer, and its scope of use can be within the conditions specified in Table 3. Table 3 Range of use
Evaporator side
Standard nominal operating conditions
Applied nominal operating conditions
Outlet temperature
m/(h·kw)
1) Make-up water temperature 30℃±1℃.
2) Make-up water temperature 294℃+0.5C
5.6.2 Partial load condition
Water-cooled
Inlet temperature
15.5~~35.0
m/(h·kw)
Condenser
Air-cooled
Imported dry bulb
Imported wet bulb
Evaporative cooling
Imported dry bulb
Imported wet bulb
15.5~27.0m
10.0~26.72
JB/T3355-1998
The action of the unit's partial load unloading mechanism should be flexible and reliable. 5.6.2.1
5.6.2.2 Part load conditions are specified in accordance with Table 4 and the following conditions: Table 4 Part load conditions Conditions
Evaporator side
Integrated part load specified conditions
(IPLV)
Application part load specified conditions
(APLV)
100% load
0% load
100% load
0% load
Outlet temperature
a) Full load flow when the cold water flow is the nominal condition: Water-cooled
Inlet temperature
Condenser side
Air-cooled
Inlet dry bulb temperature
Evaporative cooling
Inlet wet bulb temperature
b) Dirt on the cold water and cooling water sides The coefficient is 0.086m·℃/kW, 0.043m2.℃/kW on the air side, and 0m2·℃/kW on the refrigerant side
c) Regulations on the condenser side:
Water-cooled: The cooling water flow rate is the full load flow rate under nominal conditions: Air-cooled: The cooling air volume can be reduced as the unit unloading conditions change (as designed); Evaporative cooling: The cooling air volume can be reduced as the unit unloading conditions change, but the spray water volume is still the flow rate under nominal conditions, and the make-up water temperature is as specified in Table 3; d) The atmospheric pressure during operation of air-cooled and evaporative cooling is 101kPa. If there is a difference, it should be converted according to the local and current atmospheric pressure:
e) Partial load performance data (cooling capacity-total power consumption) should be represented by a curve graph as a ratio (%) of the full load performance data under nominal conditions.
5.6.2.3 The inlet temperature of the condenser at part load decreases linearly from the temperature at 100% load to the temperature at 0% load. The value is shown in Appendix C (Suggested Appendix) 5.6.2.4 The part load performance coefficient is calculated by formula (1): Comprehensive part load performance coefficient PLV = 0.174 + 0.39B + 0.33C + 0.11D W/kW Application part load performance coefficient APLV
Where: A
100% load performance coefficient COP (or COP'), W/kW: 75% load performance coefficient COP (or COP'), W/kW; -50% load performance coefficient COP (or COP'), W/kW; 25% load performance coefficient COP (or COP), W/kW. 5.7 Noise and vibration
5.7.1 The unit shall measure the noise sound pressure level in accordance with the provisions of 6.3.5.1. 5.7.2 The unit shall measure double amplitude or single amplitude in accordance with the provisions of 6.3.5.2. 5.7.3 The noise sound pressure level and amplitude value of the unit shall be provided in the product catalog. 5.8 Electrical safety regulations
5.8.1 Voltage change performance
The unit is tested according to the method of 6.3.6.1, and its safety protection mechanism does not operate, and there is no abnormal phenomenon and it can operate continuously. 5.8.2 Insulation resistance
The unit is tested for insulation resistance according to the method of 6.3.6.2, and it should meet the following requirements: 380V line insulation resistance should not be less than 1MQ; ..
JB/T3355-1998
6000V line insulation resistance should not be less than 5MQ; 10000V line insulation resistance should not be less than 10M2. 5.8.3 Withstand voltage
The unit is tested for withstand voltage according to the method of 6.3.6.3, and it should be able to withstand the applied voltage. 5.8.4 Starting current
The unit is tested for starting current according to the method of 6.3.6.4, and the starting current value should not be greater than 115% of the nominal starting current value. 5.8.5 Water-sprayed insulation performance
After the water-sprayed insulation performance test is carried out according to the method in 6.3.6.5, the insulation resistance value shall comply with the provisions of 5.8.2, and the withstand voltage shall comply with the provisions of 5.8.3.
5.9The surfaces in contact with the refrigerant and lubricating oil in the unit shall be kept clean and dry. The outer surfaces of the unit shall be clean and the painted surface shall be smooth. The installation of pipeline accessories shall be horizontal and vertical, and beautiful. The unit's overall dimensions shall comply with the design requirements, and the deviations of its length, width and height shall not exceed the requirements of c (rough) level in GB/T1804.
5.10The manufacturer shall replace or repair the unit free of charge within 18 months from the date of shipment from the manufacturer if the unit is damaged or cannot work normally due to poor manufacturing quality, provided that the user complies with the provisions for transportation, storage, installation, use and maintenance of the unit. 6 Test methods
6.1 Accuracy of measuring instruments and measurement regulations
6.1.1 The accuracy of measuring instruments shall comply with the provisions of Appendix A of GB10870-89 and ZBJ73022 (the missing part in GB10870). 6.1.2 The measurement regulations are as follows:
a) The installation and use of measuring instruments shall comply with the provisions of Appendix A and Appendix B of GB10870-89: b) The measurement of air wet-bulb temperature shall comply with the provisions of ZBJ73022 and be measured by sampling method:) The inlet dry-bulb temperature of air-cooled and evaporative cooling types shall be measured at the midpoint of each air inlet side of the outdoor unit (when the unit is too long, add a measuring point every 1.5m on the left and right), 0.6m away from the surface, and take the average value; d) The compressor exhaust pressure shall be measured as close to the exhaust port as possible. 6.2 Installation and test regulations of the unit
6.2.1 Installation of the unit
The unit shall be installed in accordance with the type specified by the manufacturer, and no structural modification that affects the cooling capacity shall be made. The environment of air-cooled and evaporative cooling units shall be sufficiently wide, and the wind speed near the unit shall be reduced to a sufficiently low value so as not to affect the performance of the unit. 6.2.2 Test regulations
6.2.2.1 The deviation of the flow rate of cold water and cooling water from the specified value shall not exceed ±5%. 6.2.2.2 The deviation of the water temperature and the dry and wet bulb temperatures of the unit from the specified value shall not exceed the provisions of Table 5. It shall also be confirmed that the temperature of cold water and cooling water is the average temperature of the entire water flow. Table 5 Specified deviation values
Evaporator side
Standard nominal operating conditions
Applied nominal operating conditions
Outlet temperature
m(hkw)
0.172±5%
30.155±5%
1) Make-up water temperature 30℃±1℃
2) Make-up water temperature 29.4℃±0.5℃
Water-cooled
Inlet temperature
30.0±0.3
29.4±0.3
m/(h·kw)
0.224±5%
0.195±5%
Air-cooled
Evaporative cooling
Inlet Inlet dry bulb
Inlet wet bulb
35.0±1.0
35.0±0.3
Inlet dry bulb
Inlet wet bulb
24.0±0.5l)
23.9±0.32)
6.2.2.3 For large air-cooled and evaporative cooling units, since it is difficult to ensure the air inlet temperatures in Table 3 or 5, the refrigerant saturated condensing temperature of the compressor exhaust pressure corresponding to the cold water outlet temperature determined by the test data of small units of the same type in 6
JB/T3355-1998
and simulation calculation can be used for testing (adjust the air volume if necessary). The deviation of the corresponding temperature value should not be greater than ±0.3℃. 6.2.2.4 During the partial load test, the cooling capacity deviation shall not be greater than ±2% of the full load cooling capacity. 6.2.2.5 The deviation between the voltage at the terminal of the unit and the rated voltage shall not be greater than ±3%, and the deviation between the frequency and the rated frequency shall not be greater than ±1%
6.2.2.6 The deviation of atmospheric pressure shall not be greater than ±5%. If it is greater than ±5%, correction (conversion) shall be made. 6.2.3 Water quality
The quality of cold water, cooling water and make-up water used in the unit shall comply with the provisions of GBJ50. 6.3 Test requirements
6.3.1 Main components and main accessories 6.3.1.1 Check the composition of the complete set of equipment according to the technical requirements. It shall comply with the provisions of 5.2. 6.3.1.2 The acceptance and inspection of the main accessories shall comply with the provisions of 5.3. 6.3.1.3 During the action test of safety control elements and devices, each element and device shall operate normally, and the controlled and adjusted parameters shall be stable within the given range.
6.3.2 Unit airtightness, hydraulic pressure and vacuum test 6.3.2.1 Airtightness test: The refrigerant side of the unit shall be tested at the design pressure in accordance with the JB/T6917 airtightness test method and shall comply with the provisions of 5.4.1.
6.3.2.2 Hydraulic pressure test: The water side of the unit shall be tested at 1.25 times the design pressure in accordance with the JB/T6917 hydraulic pressure test method and shall comply with the provisions of 5.4.2;
6.3.2.3 Vacuum test: After the refrigerant side of the unit passes the airtightness test, it shall be evacuated to an absolute pressure of 1 kPa in accordance with the JB/T6917 vacuum test method (during the vacuum test, the water side hydraulic pressure test may also be carried out at the same time), and the test shall comply with the provisions of 5.4.3. 6.3.3 Unit nominal operating performance test
6.3.3.1 Refrigeration capacity and total power consumption test: Set the unit unloading mechanism and other energy adjustment to the full load refrigeration capacity position and conduct the test in accordance with the provisions of Table 1 and 4.3.2. Conduct the test to determine and calculate the refrigeration capacity and total power consumption in accordance with the following provisions, and shall comply with the provisions of 5.5a) and 5.5b). At the same time, measure the operating working current and power factor, etc. a) Water-cooled unit: The refrigeration capacity shall be in accordance with the provisions of GB10870. The main test shall be conducted by the liquid refrigerant method for test determination and calculation. The verification test shall be conducted by the unit heat balance method for test determination and calculation. The thermal balance deviation of the two shall be calculated according to formula (3) in 6.3.3.4 and shall not be greater than ±5%g
The total power consumption shall be measured near the compressor motor terminal. If the inverter or motor starter is part of the compressor circuit, it shall be measured at the inverter or motor starter terminal. The power consumed by the auxiliary equipment shall be measured at the same time as the above test and shall be included in the total power consumption, but the power consumed by the water pump shall not be included. b) Air-cooled and evaporative cooling units: The cooling capacity shall be tested, measured and calculated by the liquid refrigerant method in accordance with the provisions of GB10870. The indoor air conditioning device in the air difference method of ZBJ73022 shall be used on the condensing side to reach the ambient temperature conditions of the outdoor unit. Large units may also be tested, measured and calculated by the method specified in 6.2.2.3. In addition to the items included in 6.3.3.1a), the total power consumption shall also include the power consumed by the condenser fan and condenser spray pump. Their power consumption shall comply with the provisions of 5.5d). 6.3.3.2 Coefficient of performance: The cooling capacity 9. (W) measured in 6.3.3.1 and the total power consumption N. (kW) shall be calculated according to formula (2): COP = g./N. W/kW......
The calculation result shall comply with the provisions of 5.5c and the nominal operating performance coefficient value in Table 2. (2
6.3.3.3 Pressure loss on the water side: When conducting the above test, the pressure loss of cold water and cooling water shall be measured in accordance with the resistance determination regulations and methods of JB/T7247, which shall comply with the provisions of 5.5e). 6.3.3.4 When testing the water-cooled unit, the main test and verification test heat balance deviation shall be calculated according to formula (3): 7
JB/T3355-1998
4= (g + N) /Q,×100%.
Where: O—condenser heat rejection (if the motor is cooled, it should also be included), kW. (3)
6.3.3.5 When the user's required water side fouling coefficient exceeds 4.3.2, the manufacturer shall conduct the unit performance test by increasing the cooling water inlet temperature and/or reducing the cold water outlet temperature in accordance with the method agreed upon with the user. 6.3.4 Unit Partial Load Performance Test
6.3.4.1 The unit shall conduct a partial load performance test in accordance with the operating conditions specified in 5.6.2 and the test provisions of 6.2.2. 6.3.4.2 After the unit has stabilized under partial load conditions, the cooling capacity and total power consumption shall be measured in accordance with the method of 6.3.3.1, and the refrigeration performance coefficient shall be calculated in accordance with 6.3.3.2.
6.3.4.3 When the unit is subjected to partial load test, the thermal balance deviation between the measurement and calculation results of the main test and the check test of the water-cooled unit shall be calculated according to formula β) and shall comply with the provisions of Table 6. Table 6 Thermal balance deviation at partial load
Load rate
Thermal balance deviation
6.3.4.4 Calculate IPLV or APLV according to formula (U), where the calculation result of APLV shall comply with the relevant provisions of 5.5c) and Table 2, and IPLV records shall be archived.
6.3.4.5 If the unit cannot operate at the 25% load point, the inlet water or air temperature of the unit condenser shall be maintained at the temperature corresponding to the 25% load and operate at the minimum cooling capacity. Then, 25% of the 100% cooling capacity obtained from the test shall be divided by the total power consumption measured at the above minimum cooling capacity point, and the result shall be used to represent the coefficient of performance COP (or COP') at 25% load. For calculation examples, see Appendix D (Suggested Appendix).
6.3.4.6 According to the provisions of 5.6.6.2e), draw a curve chart of partial load cooling capacity (%)-total power consumption (%). 6.3.5 Noise and vibration measurement
6.3.5.1 Noise measurement
Measurement hexahedron
Basic hexahedron
Main measuring points
-Additional measuring points
Figure 1 Measuring points of test unit
a) Measurement regulations: The noise measurement of the unit shall comply with the relevant provisions of JB4330, such as a reflecting plane, the quantity to be measured and the measurement error, the test instrument, the installation and operation of the unit, the reference body, the background noise (the maximum size of the reference body exceeds 1m), measurement, etc. 8
JB/T3355-1998
b) Measurement point configuration: The measurement hexahedron is shown in Figure 1. The main measuring points (symbol × in the figure) and additional measuring points (symbol ○ in the figure) on the hexahedron are shown in Figure 1. The measuring points are located on the measuring hexahedron, 1m apart from the main measuring points, 1.5m from the ground and 1m away from the reference parallelepiped.
C) Provisions for measuring points:
Octave band measurement (125～8000Hz octave band) should be carried out at the four main measuring points shown in Figure 1, and A-level sound pressure level measurement should be carried out at the four main measuring points and additional measuring points. A complete set of data should be measured when the unit is running, and a second set of complete data should be measured when the unit is stopped, but all other equipment in the area is still running as before. The format for recording the measurement results is shown in Appendix E (Suggestive Appendix).
-A measuring point within 1m away from the second reflecting surface of the wall or away from other reflecting surfaces greater than 1m is invalid, and any measuring point that does not meet the above provisions will not be recorded. d) Calculation of average sound pressure level: The average sound pressure level is calculated using formula (5) in JB4330-86, or the Nomogram method shown in Appendix E is used. When the calculation results of the three are inconsistent, the calculation result of the formula shall prevail. 6.3.5.2 Vibration measurement
a) Measurement regulations: The vibration measurement of the unit shall be carried out in accordance with the relevant regulations of JB/T4329, such as instruments, unit installation, operating status, measurement requirements, test reports, etc.
b) Measurement point configuration: The measurement position of the closed integral unit is shown in Figure 2, at points ①, ②, ③, ①, etc. on the front, back, left and right sides of the heat exchanger foot. The measurement point position of the split unit can be determined according to the agreement between the manufacturer and the user. c) Measurement method: According to the above measurement point positions, measure the vibration amplitude in the vertical, horizontal and axial directions respectively. Before
6.3.6 Electrical safety test
Figure 2 Measurement point location
Before
6.3.6.1 Voltage change test: Under the nominal operating temperature conditions in Table 1, the unit is operated for 1 hour with the power supply voltage changing within the range of ±10% of the rated voltage value. This shall comply with the provisions of 5.8.1. 6.3.6.2 Insulation resistance test: Before the cooling capacity and total power consumption test in 6.3.3.1, a 500V insulation resistance meter is used for a 380V circuit, a 1000V insulation resistance meter is used for a 6000V circuit, and a 2500V insulation resistance meter is used for a 10000V circuit. The insulation resistance between the live parts of the unit and the non-live parts that may be grounded shall comply with the provisions of 5.8.2. 6.3.6.3 Withstand voltage test: After the test in 6.36.2, a basic sinusoidal voltage with a frequency of 50IZ is applied between the live parts and the non-live metal parts of the unit for 1 minute. The test voltage value is 1500V when the single-phase rated voltage is 220V, 1800V when the three-phase rated voltage is 380V, 1.5 times the rated voltage when the three-phase rated voltage is 6000V and 10000V, 1000V for motors with a rated power less than 400W, and 500V for parts with a voltage to ground less than 30V. The test results shall comply with the provisions of 5.8.3. If the motor and other electrical equipment have been provided with a certificate of conformity by the manufacturer, this part of the equipment may be exempted from inspection during re-inspection. However, when the enclosed motor is cooled by refrigerant, a withstand voltage test shall be carried out using a 0.8 times test voltage value. In addition, within the voltage range of the control circuit, in the control circuit with a DC voltage to ground of less than 30V, the electronic components used may be exempted from this withstand voltage test.
6.3.6.4 Starting current test: After the unit has been operated under the test conditions in 6.3.3.1, the unit shall be operated at rated current of 95m and 1m from the reference parallelepiped.
C) Provisions for measurement points:
Octave band measurement (125～8000Hz octave band) should be carried out at the four main measurement points shown in Figure 1, and A-level sound pressure level measurement should be carried out at the four main measurement points and additional measurement points. A complete set of data should be measured when the unit is running, and a second set of complete data should be measured when the unit is stopped but all other equipment in the area is still running as before. The format for recording the measurement results is shown in Appendix E (Suggestive Appendix).
-The measurement points within 1m away from the second reflective surface of the wall or away from other reflective surfaces greater than 1m are invalid, and any measurement point that does not meet the above provisions will not be recorded. d) Calculation of average sound pressure level: The average sound pressure level is calculated using formula (5) in JB4330-86, or the Nomograph method shown in Appendix E. If the calculation results of the three are inconsistent, the calculation result of the formula shall prevail. 6.3.5.2 Vibration measurement
a) Measurement regulations: The vibration measurement of the unit shall be carried out in accordance with the relevant regulations of JB/T4329, such as instruments, unit installation, operating status, measurement requirements, test reports, etc.
b) Measurement point configuration: The measurement position of the closed integral unit is shown in Figure 2, at points ①, ②, ③, ①, etc. on the front, back, left and right sides of the heat exchanger foot. The measurement point position of the split unit can be determined according to the agreement between the manufacturer and the user. c) Measurement method: According to the above measurement point positions, measure the vibration amplitude in the vertical, horizontal and axial directions respectively.
6.3.6 Electrical safety test
Figure 2 Measurement point position
Before
6.3.6.1 Voltage change test: Under the nominal operating temperature conditions in Table 1, the unit is operated for 1 hour with the power supply voltage changing within the range of ±10% of the rated voltage value, which shall comply with the provisions of 5.8.1. 6.3.6.2 Insulation resistance test: Before the cooling capacity and total power consumption test in 6.3.3.1, a 500V insulation resistance meter shall be used for a 380V circuit, a 1000V insulation resistance meter shall be used for a 6000V circuit, and a 2500V insulation resistance meter shall be used for a 10000V circuit. The insulation resistance between the live parts of the unit and the non-live parts that may be grounded shall comply with the provisions of 5.8.2. 6.3.6.3 Withstand voltage test: After the test in 6.36.2, a basic sinusoidal voltage with a frequency of 50IZ is applied between the live parts and the non-live metal parts of the unit for 1 minute. The test voltage value is 1500V when the single-phase rated voltage is 220V, 1800V when the three-phase rated voltage is 380V, 1.5 times the rated voltage when the three-phase rated voltage is 6000V and 10000V, 1000V for motors with a rated power less than 400W, and 500V for parts with a voltage to ground less than 30V. The test results shall comply with the provisions of 5.8.3. If the motor and other electrical equipment have been provided with a certificate of conformity by the manufacturer, this part of the equipment may be exempted from inspection during re-inspection. However, when the enclosed motor is cooled by refrigerant, a withstand voltage test shall be carried out using a 0.8 times test voltage value. In addition, within the voltage range of the control circuit, in the control circuit with a DC voltage to ground of less than 30V, the electronic components used may be exempted from this withstand voltage test.
6.3.6.4 Starting current test: After the unit has been operated under the test conditions in 6.3.3.1, the unit shall be operated at rated current of 95m and 1m from the reference parallelepiped.
C) Provisions for measurement points:
Octave band measurement (125～8000Hz octave band) should be carried out at the four main measurement points shown in Figure 1, and A-level sound pressure level measurement should be carried out at the four main measurement points and additional measurement points. A complete set of data should be measured when the unit is running, and a second set of complete data should be measured when the unit is stopped but all other equipment in the area is still running as before. The format for recording the measurement results is shown in Appendix E (Suggestive Appendix).
-The measurement points within 1m away from the second reflective surface of the wall or away from other reflective surfaces greater than 1m are invalid, and any measurement point that does not meet the above provisions will not be recorded. d) Calculation of average sound pressure level: The average sound pressure level is calculated using formula (5) in JB4330-86, or the Nomograph method shown in Appendix E. If the calculation results of the three are inconsistent, the calculation result of the formula shall prevail. 6.3.5.2 Vibration measurement
a) Measurement regulations: The vibration measurement of the unit shall be carried out in accordance with the relevant regulations of JB/T4329, such as instruments, unit installation, operating status, measurement requirements, test reports, etc.
b) Measurement point configuration: The measurement position of the closed integral unit is shown in Figure 2, at points ①, ②, ③, ①, etc. on the front, back, left and right sides of the heat exchanger foot. The measurement point position of the split unit can be determined according to the agreement between the manufacturer and the user. c) Measurement method: According to the above measurement point positions, measure the vibration amplitude in the vertical, horizontal and axial directions respectively.
6.3.6 Electrical safety test
Figure 2 Measurement point position
Before
6.3.6.1 Voltage change test: Under the nominal operating temperature conditions in Table 1, the unit is operated for 1 hour with the power supply voltage changing within the range of ±10% of the rated voltage value, which shall comply with the provisions of 5.8.1. 6.3.6.2 Insulation resistance test: Before the cooling capacity and total power consumption test in 6.3.3.1, a 500V insulation resistance meter shall be used for a 380V circuit, a 1000V insulation resistance meter shall be used for a 6000V circuit, and a 2500V insulation resistance meter shall be used for a 10000V circuit. The insulation resistance between the live parts of the unit and the non-live parts that may be grounded shall comply with the provisions of 5.8.2. 6.3.6.3 Withstand voltage test: After the test in 6.36.2, a basic sinusoidal voltage with a frequency of 50IZ is applied between the live parts and the non-live metal parts of the unit for 1 minute. The test voltage value is 1500V when the single-phase rated voltage is 220V, 1800V when the three-phase rated voltage is 380V, 1.5 times the rated voltage when the three-phase rated voltage is 6000V and 10000V, 1000V for motors with a rated power less than 400W, and 500V for parts with a voltage to ground less than 30V. The test results shall comply with the provisions of 5.8.3. If the motor and other electrical equipment have been provided with a certificate of conformity by the manufacturer, this part of the equipment may be exempted from inspection during re-inspection. However, when the enclosed motor is cooled by refrigerant, a withstand voltage test shall be carried out using a 0.8 times test voltage value. In addition, within the voltage range of the control circuit, in the control circuit with a DC voltage to ground of less than 30V, the electronic components used may be exempted from this withstand voltage test.
6.3.6.4 Starting current test: After the unit has been operated under the test conditions in 6.3.3.1, the unit shall be operated at rated current of 9
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Machinery Industry Standard of the People's Republic of China
JB/T3355—1998
Centrifugal water-chilling packages
Centrifugal water-chilling packages1998-03-19 Issued
Ministry of Machinery Industry of the People's Republic of China
1998-07-01 Implementation
JB/T3355—1998
1 Scope
2 Reference standards
3 Definition
4 Types and basic parameters
5 Technical requirements
6 Test methods
7 Inspection rules
8 Marking, packaging and storage
Appendix A (suggestive appendix) Unit model indication method Appendix B (suggestive appendix) Example of calculation of allowable deviation Appendix C (suggestive appendix) Part load temperature conditions and deviation times
Appendix D (suggestive appendix) Calculation of comprehensive and applied part load performance factors (IPLV and APLV) Appendix E (suggestive appendix) Noise measurement record format and Nomograph 2 for calculation of average sound pressure level
JB/T3355-1998
This standard is a revision of JB/T3355-91 "Centrifugal chillers". This revision adopts two nominal operating conditions, among which the application of specified operating conditions is applicable to units for import and export trade and technology introduction. Appendices A, B, C, D and E of this standard are all suggestive appendices. This standard will replace JB/T3355-91 from the date of entry into force. This standard is proposed and managed by the Refrigeration Equipment Standardization Technical Committee of the Ministry of Machinery Industry. The drafting units of this standard are Chongqing General Industry (Group) Co., Ltd. and Hefei General Machinery Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Wu Honglan, Han Shuheng and Ren Jinlu. 1 Scope
Machinery Industry Standard of the People's Republic of China
Centrifugal water-chilling units
Centrifugal water-chilling packages JB/T3355—1998
Replaces JB/T3355—91
This standard specifies the basic requirements for the type, basic parameters, technical requirements, test methods, inspection rules, marking, packaging and storage of centrifugal water-chilling units driven by electric motors (hereinafter referred to as units). This standard applies to units with a cooling capacity of more than 348.8kW for central air conditioning or process chillers. It also applies to units that dissolve chemical additives in water to prevent freezing due to low outdoor temperatures. Units driven by engines (diesel engines or gas engines) or turbine engines (steam turbines or gas turbines) may refer to this standard for implementation. This standard does not apply to units dedicated to drinking water, beverages and industries that do not use water as a coolant. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB755-87
GB1032—85
GB1226—86
GB 1497-85
GB/T 1804—92www.bzxz.net
GB 2537-—81
GB 390691
GB 725187
GB 7373-87
GB 777887
GB 10870—89
GB/T 1330691
GB/T13348—92
GB1350092
GBJ50—83
JB/T4329—1997||t t||JB4330—86
JB/T6411—92
JB/T671993
JB/T6918—93
JB/T7247— 94
Basic technical requirements for rotating electrical machines
Test methods for three-phase asynchronous motors
General pressure gauges
Basic standards for low-voltage electrical appliances
General tolerances Unspecified tolerances for linear dimensions
Turbine oil
3-35 kV AC metal-enclosed switchgear
Low-voltage complete switchgear
Industrial use of difluorochloromethane (F22)
Refrigerant numbering method
Performance test methods for positive displacement chillers
General technical conditions for packaging of electromechanical products
General technical conditions for three-phase asynchronous motors for closed refrigeration compressors Design specifications for industrial circulating cooling water treatment
Positive displacement chillers (heat pumps)
Determination of sound power levels of noise for refrigeration and air-conditioning equipment Axial fans for HVAC
Pressure vessels for refrigeration equipment||tt| |Metal and glass sintered level gauge and sight glass for refrigeration Lithium bromide absorption chiller
Approved by the Ministry of Machinery Industry on March 19, 1998
Engineering Law
Implemented on July 1, 1998
JB/T7659.295
JB/T7659.595
JB/T766695
JB/T7771—95
ZB J73 02—89
ZBJ73025—89
SH 034992
3 Definitions
JB/T3355-1998
Water-cooled condenser for Freon refrigeration device
Freon refrigeration device Finned heat exchanger
Nominal operating conditions for refrigeration and air-conditioning equipment General provisions Pressure and differential pressure controllers for refrigeration
Test methods for unit air conditioners
Model compilation method for refrigeration machines
Refrigeration machine oil
This standard adopts the following definitions.
3.1 Nominal operating condition coefficient of performance (COP)
The ratio obtained by dividing the unit's cooling capacity by the total input electrical power under the nominal operating conditions specified in the standard (see Table 1). 3.2 Application Nominal Condition Performance Coefficient (COP') Under the application nominal conditions specified in the standard (see Table 1, the ratio of the unit's cooling capacity divided by the total input power. 3.3 Integrated Part Load Performance Coefficient (IPLV) Under the nominal conditions specified in the standard (see Table 4), the unit's partial load performance coefficient calculated by the method specified in 5.6.2. 3.4 Application Part Load Performance Coefficient (APLV) Under the nominal conditions specified in the application (see Table 4), the unit's partial load performance coefficient calculated by the method specified in 5.6.2. 4 Type and Basic Parameters
4.1.1 Classification by refrigeration compressor type:
Open type;
Closed type (B).
4.1.2 Classification by condensation side heat exchange method:- Water cooling type:
Air cooling type (F):
Evaporative cooling type
Note: The letters in brackets are the unit type codes. Those without codes are not indicated in the model. 4.2 Model
For the compilation method of the unit model, see Appendix A (suggestive appendix). 4.3 Basic parameters
4 .3.1 Nominal operating conditions
The temperature conditions of the unit's standard nominal operating conditions and application nominal operating conditions shall comply with the provisions of Table 1 in addition to the provisions of JB/T7666. Table 1 Nominal operating conditions specified conditions
Evaporator side
Standard nominal operating conditions
Application nominal operating conditions
Outlet temperature
m/(h·kw)
Water-cooled
Inlet temperature
m/hkw)
Air-cooled
Inlet dry bulb
Evaporative cooling| |tt||Imported wet bulb
Imported dry bulb
Imported wet bulb
4.3.2 Other provisions for nominal working conditions
JB/T3355-1998
a) The fouling coefficient on the water side is 0.086m2:℃/kW, on the air side is 0.043m,℃/kW, and on the refrigerant side is 0m.℃kW; b) The power supply for the compressor motor is three-phase AC, with rated voltages of 380V, 6000V and 10000V respectively, and a rated frequency of 50Hzc) The atmospheric pressure is 101kPa.
4.3.3 Performance coefficient at nominal conditions
The performance coefficient at nominal conditions and the performance coefficient at application part load of the unit shall not be lower than the values in Table 2. Table 2 Performance coefficient
Water-cooled
Air-cooled or
Evaporative cooling
5 Technical requirements
General provisions
≤527
Nominal performance coefficient (COP and COP')
Application part load performance coefficient (APLV)
Nominal performance coefficient (COP and COP)
Application part load performance coefficient (APLV)
>527~1163
The unit shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved through the prescribed procedures or according to the agreement between the user and the manufacturer). 5.2 Composition of complete set of equipment
5.2.1 Compressor motor unit consisting of one or more centrifugal single-stage or multi-stage compressors, equipped with necessary lubrication systema) Motor for closed compressor: Motor and necessary gear transmission mechanism enclosed in refrigerant atmosphere. b) Motor for open compressor: Motor and gear and coupling as necessary. 5.2.2 Condenser: Water-cooled condenser or air-cooled condenser or evaporative cooling condenser. 5.2.3 Evaporator: Refrigerant-water heat exchanger. 5.2.4 Other supporting equipment
5.2.4.1 Regulator and control equipment for adjusting the cooling capacity of the unit and the required cold water temperature. Relevant safety protection or control equipment that meets the requirements of safety regulations: 5.2.4.2
Refrigerant high pressure protection;
Oil pressure too low protection (or bearing temperature high temperature protection);-Main motor abnormal protection:
-Cold water anti-freezing (cold water low temperature, refrigerant low temperature and refrigerant low pressure, etc.) protection: cold water pump interlock or cold water water cut-off or insufficient flow) protection; cooling water pump (or condensing fan or spray water pump) interlock or cooling water water cut-off (or insufficient flow) protection. 5.2.4.3 The electrical operating equipment and related instruments of the unit: motor current limiting equipment;
-Main motor starting equipment;
-Operation panel (indicator light, relay, switch button, time relay, pressure gauge, terminal and necessary wiring, etc.) 5.3 Main accessories of the unit
5.3.1 The main accessories of the unit shall comply with the provisions of the corresponding standards. 5.3.2 The refrigeration compressor shall comply with the provisions of the relevant standards for centrifugal refrigeration compressors. 5.3.3 The matching motors shall comply with the provisions of GB755. Enclosed motors shall comply with the relevant provisions of GB135003
JB/T3355-1998
5.3.4 The pressure vessels, condensers and evaporators of the units shall comply with the provisions of JB/T6917, JB/T7659.2 and JB/T7659.5.
5.3.5 The axial flow general purpose machines of the units shall comply with the provisions of JB/T6411. 5.3.6 The pipeline accessories and safety protection components and devices of the units shall comply with the provisions of the following standards: a) The pressure and differential pressure controllers for refrigeration shall comply with the provisions of JB/T7771: b) The pressure gauges of the units shall comply with the provisions of GB1226: The liquid level gauges and oil sight glasses of the units shall comply with the provisions of JB/T6918. 5.3.7 The refrigeration oil used in the unit shall comply with the provisions of SH0349, and the gearbox oil shall comply with the provisions of GB2537. 5.3.8 The control instrument cabinet and the selected electric control switchgear of the unit shall comply with the relevant provisions of GB1497, GB3906 and GB7251. 5.3.9 The refrigerant used in the unit shall comply with the provisions of GB7373 and other first-class products or above, and the protection of the ozone layer and new refrigerants shall comply with the provisions of relevant standards.
5.4 Air tightness, hydraulic pressure and vacuum test
5.4.1 Air tightness test
When the unit is tested according to method 63.2.1, the pressure on the refrigerant side shall not drop significantly. When using an electronic halogen leak detector, the leakage rate shall be less than 14ga.
5.4.2 Hydraulic test
When the water side of the unit is tested according to method 6.3.2.2, there shall be no abnormal deformation and water leakage in each water system. 5.4.3 Vacuum test
When the refrigerant side of the unit is tested according to method 6.3.23, there shall be no abnormal deformation in all parts of the refrigerant side, and the pressure recovery shall be less than 0.4kPa within 24 hours
5.5 Unit nominal operating performance
When the unit is tested according to method 6.3.3, it shall comply with the following provisions. The calculation and evaluation examples are shown in Appendix B (suggestive appendix): a) The cooling capacity shall not be less than 95% of the nominal value b) The total power consumption shall not be greater than 105% of the nominal value of the unit; c) The unit nominal operating coefficient of performance and the application part load coefficient of performance shall not be less than the values in Table 2; d) The input power of the condenser fan and spray pump of the air-cooled and evaporative cooling units shall not be greater than 110% of the nominal specified value e) The pressure loss of cold water and cooling water shall not be greater than 110% of the nominal specified value. 5.6 Scope of use and partial load conditions of the unit 5.6.1 Scope of use
The user can negotiate with the manufacturer, and its scope of use can be within the conditions specified in Table 3. Table 3 Range of use
Evaporator side
Standard nominal operating conditions
Applied nominal operating conditions
Outlet temperature
m/(h·kw)
1) Make-up water temperature 30℃±1℃.
2) Make-up water temperature 294℃+0.5C
5.6.2 Partial load condition
Water-cooled
Inlet temperature
15.5~~35.0
m/(h·kw)
Condenser
Air-cooled
Imported dry bulb
Imported wet bulb
Evaporative cooling
Imported dry bulb
Imported wet bulb
15.5~27.0m
10.0~26.72
JB/T3355-1998
The action of the unit's partial load unloading mechanism should be flexible and reliable. 5.6.2.1
5.6.2.2 Part load conditions are specified in accordance with Table 4 and the following conditions: Table 4 Part load conditions Conditions
Evaporator side
Integrated part load specified conditions
(IPLV)
Application part load specified conditions
(APLV)
100% load
0% load
100% load
0% load
Outlet temperature
a) Full load flow when the cold water flow is the nominal condition: Water-cooled
Inlet temperature
Condenser side
Air-cooled
Inlet dry bulb temperature
Evaporative cooling
Inlet wet bulb temperature
b) Dirt on the cold water and cooling water sides The coefficient is 0.086m·℃/kW, 0.043m2.℃/kW on the air side, and 0m2·℃/kW on the refrigerant side
c) Regulations on the condenser side:
Water-cooled: The cooling water flow rate is the full load flow rate under nominal conditions: Air-cooled: The cooling air volume can be reduced as the unit unloading conditions change (as designed); Evaporative cooling: The cooling air volume can be reduced as the unit unloading conditions change, but the spray water volume is still the flow rate under nominal conditions, and the make-up water temperature is as specified in Table 3; d) The atmospheric pressure during operation of air-cooled and evaporative cooling is 101kPa. If there is a difference, it should be converted according to the local and current atmospheric pressure:
e) Partial load performance data (cooling capacity-total power consumption) should be represented by a curve graph as a ratio (%) of the full load performance data under nominal conditions.
5.6.2.3 The inlet temperature of the condenser at part load decreases linearly from the temperature at 100% load to the temperature at 0% load. The value is shown in Appendix C (Suggested Appendix) 5.6.2.4 The part load performance coefficient is calculated by formula (1): Comprehensive part load performance coefficient PLV = 0.174 + 0.39B + 0.33C + 0.11D W/kW Application part load performance coefficient APLV
Where: A
100% load performance coefficient COP (or COP'), W/kW: 75% load performance coefficient COP (or COP'), W/kW; -50% load performance coefficient COP (or COP'), W/kW; 25% load performance coefficient COP (or COP), W/kW. 5.7 Noise and vibration
5.7.1 The unit shall measure the noise sound pressure level in accordance with the provisions of 6.3.5.1. 5.7.2 The unit shall measure double amplitude or single amplitude in accordance with the provisions of 6.3.5.2. 5.7.3 The noise sound pressure level and amplitude value of the unit shall be provided in the product catalog. 5.8 Electrical safety regulations
5.8.1 Voltage change performance
The unit is tested according to the method of 6.3.6.1, and its safety protection mechanism does not operate, and there is no abnormal phenomenon and it can operate continuously. 5.8.2 Insulation resistance
The unit is tested for insulation resistance according to the method of 6.3.6.2, and it should meet the following requirements: 380V line insulation resistance should not be less than 1MQ; ..
JB/T3355-1998
6000V line insulation resistance should not be less than 5MQ; 10000V line insulation resistance should not be less than 10M2. 5.8.3 Withstand voltage
The unit is tested for withstand voltage according to the method of 6.3.6.3, and it should be able to withstand the applied voltage. 5.8.4 Starting current
The unit is tested for starting current according to the method of 6.3.6.4, and the starting current value should not be greater than 115% of the nominal starting current value. 5.8.5 Water-sprayed insulation performance
After the water-sprayed insulation performance test is carried out according to the method in 6.3.6.5, the insulation resistance value shall comply with the provisions of 5.8.2, and the withstand voltage shall comply with the provisions of 5.8.3.
5.9The surfaces in contact with the refrigerant and lubricating oil in the unit shall be kept clean and dry. The outer surfaces of the unit shall be clean and the painted surface shall be smooth. The installation of pipeline accessories shall be horizontal and vertical, and beautiful. The unit's overall dimensions shall comply with the design requirements, and the deviations of its length, width and height shall not exceed the requirements of c (rough) level in GB/T1804.
5.10The manufacturer shall replace or repair the unit free of charge within 18 months from the date of shipment from the manufacturer if the unit is damaged or cannot work normally due to poor manufacturing quality, provided that the user complies with the provisions for transportation, storage, installation, use and maintenance of the unit. 6 Test methods
6.1 Accuracy of measuring instruments and measurement regulations
6.1.1 The accuracy of measuring instruments shall comply with the provisions of Appendix A of GB10870-89 and ZBJ73022 (the missing part in GB10870). 6.1.2 The measurement regulations are as follows:
a) The installation and use of measuring instruments shall comply with the provisions of Appendix A and Appendix B of GB10870-89: b) The measurement of air wet-bulb temperature shall comply with the provisions of ZBJ73022 and be measured by sampling method:) The inlet dry-bulb temperature of air-cooled and evaporative cooling types shall be measured at the midpoint of each air inlet side of the outdoor unit (when the unit is too long, add a measuring point every 1.5m on the left and right), 0.6m away from the surface, and take the average value; d) The compressor exhaust pressure shall be measured as close to the exhaust port as possible. 6.2 Installation and test regulations of the unit
6.2.1 Installation of the unit
The unit shall be installed in accordance with the type specified by the manufacturer, and no structural modification that affects the cooling capacity shall be made. The environment of air-cooled and evaporative cooling units shall be sufficiently wide, and the wind speed near the unit shall be reduced to a sufficiently low value so as not to affect the performance of the unit. 6.2.2 Test regulations
6.2.2.1 The deviation of the flow rate of cold water and cooling water from the specified value shall not exceed ±5%. 6.2.2.2 The deviation of the water temperature and the dry and wet bulb temperatures of the unit from the specified value shall not exceed the provisions of Table 5. It shall also be confirmed that the temperature of cold water and cooling water is the average temperature of the entire water flow. Table 5 Specified deviation values
Evaporator side
Standard nominal operating conditions
Applied nominal operating conditions
Outlet temperature
m(hkw)
0.172±5%
30.155±5%
1) Make-up water temperature 30℃±1℃
2) Make-up water temperature 29.4℃±0.5℃
Water-cooled
Inlet temperature
30.0±0.3
29.4±0.3
m/(h·kw)
0.224±5%
0.195±5%
Air-cooled
Evaporative cooling
Inlet Inlet dry bulb
Inlet wet bulb
35.0±1.0
35.0±0.3
Inlet dry bulb
Inlet wet bulb
24.0±0.5l)
23.9±0.32)
6.2.2.3 For large air-cooled and evaporative cooling units, since it is difficult to ensure the air inlet temperatures in Table 3 or 5, the refrigerant saturated condensing temperature of the compressor exhaust pressure corresponding to the cold water outlet temperature determined by the test data of small units of the same type in 6
JB/T3355-1998
and simulation calculation can be used for testing (adjust the air volume if necessary). The deviation of the corresponding temperature value should not be greater than ±0.3℃. 6.2.2.4 During the partial load test, the cooling capacity deviation shall not be greater than ±2% of the full load cooling capacity. 6.2.2.5 The deviation between the voltage at the terminal of the unit and the rated voltage shall not be greater than ±3%, and the deviation between the frequency and the rated frequency shall not be greater than ±1%
6.2.2.6 The deviation of atmospheric pressure shall not be greater than ±5%. If it is greater than ±5%, correction (conversion) shall be made. 6.2.3 Water quality
The quality of cold water, cooling water and make-up water used in the unit shall comply with the provisions of GBJ50. 6.3 Test requirements
6.3.1 Main components and main accessories 6.3.1.1 Check the composition of the complete set of equipment according to the technical requirements. It shall comply with the provisions of 5.2. 6.3.1.2 The acceptance and inspection of the main accessories shall comply with the provisions of 5.3. 6.3.1.3 During the action test of safety control elements and devices, each element and device shall operate normally, and the controlled and adjusted parameters shall be stable within the given range.
6.3.2 Unit airtightness, hydraulic pressure and vacuum test 6.3.2.1 Airtightness test: The refrigerant side of the unit shall be tested at the design pressure in accordance with the JB/T6917 airtightness test method and shall comply with the provisions of 5.4.1.
6.3.2.2 Hydraulic pressure test: The water side of the unit shall be tested at 1.25 times the design pressure in accordance with the JB/T6917 hydraulic pressure test method and shall comply with the provisions of 5.4.2;
6.3.2.3 Vacuum test: After the refrigerant side of the unit passes the airtightness test, it shall be evacuated to an absolute pressure of 1 kPa in accordance with the JB/T6917 vacuum test method (during the vacuum test, the water side hydraulic pressure test may also be carried out at the same time), and the test shall comply with the provisions of 5.4.3. 6.3.3 Unit nominal operating performance test
6.3.3.1 Refrigeration capacity and total power consumption test: Set the unit unloading mechanism and other energy adjustment to the full load refrigeration capacity position and conduct the test in accordance with the provisions of Table 1 and 4.3.2. Conduct the test to determine and calculate the refrigeration capacity and total power consumption in accordance with the following provisions, and shall comply with the provisions of 5.5a) and 5.5b). At the same time, measure the operating working current and power factor, etc. a) Water-cooled unit: The refrigeration capacity shall be in accordance with the provisions of GB10870. The main test shall be conducted by the liquid refrigerant method for test determination and calculation. The verification test shall be conducted by the unit heat balance method for test determination and calculation. The thermal balance deviation of the two shall be calculated according to formula (3) in 6.3.3.4 and shall not be greater than ±5%g
The total power consumption shall be measured near the compressor motor terminal. If the inverter or motor starter is part of the compressor circuit, it shall be measured at the inverter or motor starter terminal. The power consumed by the auxiliary equipment shall be measured at the same time as the above test and shall be included in the total power consumption, but the power consumed by the water pump shall not be included. b) Air-cooled and evaporative cooling units: The cooling capacity shall be tested, measured and calculated by the liquid refrigerant method in accordance with the provisions of GB10870. The indoor air conditioning device in the air difference method of ZBJ73022 shall be used on the condensing side to reach the ambient temperature conditions of the outdoor unit. Large units may also be tested, measured and calculated by the method specified in 6.2.2.3. In addition to the items included in 6.3.3.1a), the total power consumption shall also include the power consumed by the condenser fan and condenser spray pump. Their power consumption shall comply with the provisions of 5.5d). 6.3.3.2 Coefficient of performance: The cooling capacity 9. (W) measured in 6.3.3.1 and the total power consumption N. (kW) shall be calculated according to formula (2): COP = g./N. W/kW......
The calculation result shall comply with the provisions of 5.5c and the nominal operating performance coefficient value in Table 2. (2
6.3.3.3 Pressure loss on the water side: When conducting the above test, the pressure loss of cold water and cooling water shall be measured in accordance with the resistance determination regulations and methods of JB/T7247, which shall comply with the provisions of 5.5e). 6.3.3.4 When testing the water-cooled unit, the main test and verification test heat balance deviation shall be calculated according to formula (3): 7
JB/T3355-1998
4= (g + N) /Q,×100%.
Where: O—condenser heat rejection (if the motor is cooled, it should also be included), kW. (3)
6.3.3.5 When the user's required water side fouling coefficient exceeds 4.3.2, the manufacturer shall conduct the unit performance test by increasing the cooling water inlet temperature and/or reducing the cold water outlet temperature in accordance with the method agreed upon with the user. 6.3.4 Unit Partial Load Performance Test
6.3.4.1 The unit shall conduct a partial load performance test in accordance with the operating conditions specified in 5.6.2 and the test provisions of 6.2.2. 6.3.4.2 After the unit has stabilized under partial load conditions, the cooling capacity and total power consumption shall be measured in accordance with the method of 6.3.3.1, and the refrigeration performance coefficient shall be calculated in accordance with 6.3.3.2.
6.3.4.3 When the unit is subjected to partial load test, the thermal balance deviation between the measurement and calculation results of the main test and the check test of the water-cooled unit shall be calculated according to formula β) and shall comply with the provisions of Table 6. Table 6 Thermal balance deviation at partial load
Load rate
Thermal balance deviation
6.3.4.4 Calculate IPLV or APLV according to formula (U), where the calculation result of APLV shall comply with the relevant provisions of 5.5c) and Table 2, and IPLV records shall be archived.
6.3.4.5 If the unit cannot operate at the 25% load point, the inlet water or air temperature of the unit condenser shall be maintained at the temperature corresponding to the 25% load and operate at the minimum cooling capacity. Then, 25% of the 100% cooling capacity obtained from the test shall be divided by the total power consumption measured at the above minimum cooling capacity point, and the result shall be used to represent the coefficient of performance COP (or COP') at 25% load. For calculation examples, see Appendix D (Suggested Appendix).
6.3.4.6 According to the provisions of 5.6.6.2e), draw a curve chart of partial load cooling capacity (%)-total power consumption (%). 6.3.5 Noise and vibration measurement
6.3.5.1 Noise measurement
Measurement hexahedron
Basic hexahedron
Main measuring points
-Additional measuring points
Figure 1 Measuring points of test unit
a) Measurement regulations: The noise measurement of the unit shall comply with the relevant provisions of JB4330, such as a reflecting plane, the quantity to be measured and the measurement error, the test instrument, the installation and operation of the unit, the reference body, the background noise (the maximum size of the reference body exceeds 1m), measurement, etc. 8
JB/T3355-1998
b) Measurement point configuration: The measurement hexahedron is shown in Figure 1. The main measuring points (symbol × in the figure) and additional measuring points (symbol ○ in the figure) on the hexahedron are shown in Figure 1. The measuring points are located on the measuring hexahedron, 1m apart from the main measuring points, 1.5m from the ground and 1m away from the reference parallelepiped.
C) Provisions for measuring points:
Octave band measurement (125～8000Hz octave band) should be carried out at the four main measuring points shown in Figure 1, and A-level sound pressure level measurement should be carried out at the four main measuring points and additional measuring points. A complete set of data should be measured when the unit is running, and a second set of complete data should be measured when the unit is stopped, but all other equipment in the area is still running as before. The format for recording the measurement results is shown in Appendix E (Suggestive Appendix).
-A measuring point within 1m away from the second reflecting surface of the wall or away from other reflecting surfaces greater than 1m is invalid, and any measuring point that does not meet the above provisions will not be recorded. d) Calculation of average sound pressure level: The average sound pressure level is calculated using formula (5) in JB4330-86, or the Nomogram method shown in Appendix E is used. When the calculation results of the three are inconsistent, the calculation result of the formula shall prevail. 6.3.5.2 Vibration measurement
a) Measurement regulations: The vibration measurement of the unit shall be carried out in accordance with the relevant regulations of JB/T4329, such as instruments, unit installation, operating status, measurement requirements, test reports, etc.
b) Measurement point configuration: The measurement position of the closed integral unit is shown in Figure 2, at points ①, ②, ③, ①, etc. on the front, back, left and right sides of the heat exchanger foot. The measurement point position of the split unit can be determined according to the agreement between the manufacturer and the user. c) Measurement method: According to the above measurement point positions, measure the vibration amplitude in the vertical, horizontal and axial directions respectively. Before
6.3.6 Electrical safety test
Figure 2 Measurement point location
Before
6.3.6.1 Voltage change test: Under the nominal operating temperature conditions in Table 1, the unit is operated for 1 hour with the power supply voltage changing within the range of ±10% of the rated voltage value. This shall comply with the provisions of 5.8.1. 6.3.6.2 Insulation resistance test: Before the cooling capacity and total power consumption test in 6.3.3.1, a 500V insulation resistance meter is used for a 380V circuit, a 1000V insulation resistance meter is used for a 6000V circuit, and a 2500V insulation resistance meter is used for a 10000V circuit. The insulation resistance between the live parts of the unit and the non-live parts that may be grounded shall comply with the provisions of 5.8.2. 6.3.6.3 Withstand voltage test: After the test in 6.36.2, a basic sinusoidal voltage with a frequency of 50IZ is applied between the live parts and the non-live metal parts of the unit for 1 minute. The test voltage value is 1500V when the single-phase rated voltage is 220V, 1800V when the three-phase rated voltage is 380V, 1.5 times the rated voltage when the three-phase rated voltage is 6000V and 10000V, 1000V for motors with a rated power less than 400W, and 500V for parts with a voltage to ground less than 30V. The test results shall comply with the provisions of 5.8.3. If the motor and other electrical equipment have been provided with a certificate of conformity by the manufacturer, this part of the equipment may be exempted from inspection during re-inspection. However, when the enclosed motor is cooled by refrigerant, a withstand voltage test shall be carried out using a 0.8 times test voltage value. In addition, within the voltage range of the control circuit, in the control circuit with a DC voltage to ground of less than 30V, the electronic components used may be exempted from this withstand voltage test.
6.3.6.4 Starting current test: After the unit has been operated under the test conditions in 6.3.3.1, the unit shall be operated at rated current of 95m and 1m from the reference parallelepiped.
C) Provisions for measurement points:
Octave band measurement (125～8000Hz octave band) should be carried out at the four main measurement points shown in Figure 1, and A-level sound pressure level measurement should be carried out at the four main measurement points and additional measurement points. A complete set of data should be measured when the unit is running, and a second set of complete data should be measured when the unit is stopped but all other equipment in the area is still running as before. The format for recording the measurement results is shown in Appendix E (Suggestive Appendix).
-The measurement points within 1m away from the second reflective surface of the wall or away from other reflective surfaces greater than 1m are invalid, and any measurement point that does not meet the above provisions will not be recorded. d) Calculation of average sound pressure level: The average sound pressure level is calculated using formula (5) in JB4330-86, or the Nomograph method shown in Appendix E. If the calculation results of the three are inconsistent, the calculation result of the formula shall prevail. 6.3.5.2 Vibration measurement
a) Measurement regulations: The vibration measurement of the unit shall be carried out in accordance with the relevant regulations of JB/T4329, such as instruments, unit installation, operating status, measurement requirements, test reports, etc.
b) Measurement point configuration: The measurement position of the closed integral unit is shown in Figure 2, at points ①, ②, ③, ①, etc. on the front, back, left and right sides of the heat exchanger foot. The measurement point position of the split unit can be determined according to the agreement between the manufacturer and the user. c) Measurement method: According to the above measurement point positions, measure the vibration amplitude in the vertical, horizontal and axial directions respectively.
6.3.6 Electrical safety test
Figure 2 Measurement point position
Before
6.3.6.1 Voltage change test: Under the nominal operating temperature conditions in Table 1, the unit is operated for 1 hour with the power supply voltage changing within the range of ±10% of the rated voltage value, which shall comply with the provisions of 5.8.1. 6.3.6.2 Insulation resistance test: Before the cooling capacity and total power consumption test in 6.3.3.1, a 500V insulation resistance meter shall be used for a 380V circuit, a 1000V insulation resistance meter shall be used for a 6000V circuit, and a 2500V insulation resistance meter shall be used for a 10000V circuit. The insulation resistance between the live parts of the unit and the non-live parts that may be grounded shall comply with the provisions of 5.8.2. 6.3.6.3 Withstand voltage test: After the test in 6.36.2, a basic sinusoidal voltage with a frequency of 50IZ is applied between the live parts and the non-live metal parts of the unit for 1 minute. The test voltage value is 1500V when the single-phase rated voltage is 220V, 1800V when the three-phase rated voltage is 380V, 1.5 times the rated voltage when the three-phase rated voltage is 6000V and 10000V, 1000V for motors with a rated power less than 400W, and 500V for parts with a voltage to ground less than 30V. The test results shall comply with the provisions of 5.8.3. If the motor and other electrical equipment have been provided with a certificate of conformity by the manufacturer, this part of the equipment may be exempted from inspection during re-inspection. However, when the enclosed motor is cooled by refrigerant, a withstand voltage test shall be carried out using a 0.8 times test voltage value. In addition, within the voltage range of the control circuit, in the control circuit with a DC voltage to ground of less than 30V, the electronic components used may be exempted from this withstand voltage test.
6.3.6.4 Starting current test: After the unit has been operated under the test conditions in 6.3.3.1, the unit shall be operated at rated current of 95m and 1m from the reference parallelepiped.
C) Provisions for measurement points:
Octave band measurement (125～8000Hz octave band) should be carried out at the four main measurement points shown in Figure 1, and A-level sound pressure level measurement should be carried out at the four main measurement points and additional measurement points. A complete set of data should be measured when the unit is running, and a second set of complete data should be measured when the unit is stopped but all other equipment in the area is still running as before. The format for recording the measurement results is shown in Appendix E (Suggestive Appendix).
-The measurement points within 1m away from the second reflective surface of the wall or away from other reflective surfaces greater than 1m are invalid, and any measurement point that does not meet the above provisions will not be recorded. d) Calculation of average sound pressure level: The average sound pressure level is calculated using formula (5) in JB4330-86, or the Nomograph method shown in Appendix E. If the calculation results of the three are inconsistent, the calculation result of the formula shall prevail. 6.3.5.2 Vibration measurement
a) Measurement regulations: The vibration measurement of the unit shall be carried out in accordance with the relevant regulations of JB/T4329, such as instruments, unit installation, operating status, measurement requirements, test reports, etc.
b) Measurement point configuration: The measurement position of the closed integral unit is shown in Figure 2, at points ①, ②, ③, ①, etc. on the front, back, left and right sides of the heat exchanger foot. The measurement point position of the split unit can be determined according to the agreement between the manufacturer and the user. c) Measurement method: According to the above measurement point positions, measure the vibration amplitude in the vertical, horizontal and axial directions respectively.
6.3.6 Electrical safety test
Figure 2 Measurement point position
Before
6.3.6.1 Voltage change test: Under the nominal operating temperature conditions in Table 1, the unit is operated for 1 hour with the power supply voltage changing within the range of ±10% of the rated voltage value, which shall comply with the provisions of 5.8.1. 6.3.6.2 Insulation resistance test: Before the cooling capacity and total power consumption test in 6.3.3.1, a 500V insulation resistance meter shall be used for a 380V circuit, a 1000V insulation resistance meter shall be used for a 6000V circuit, and a 2500V insulation resistance meter shall be used for a 10000V circuit. The insulation resistance between the live parts of the unit and the non-live parts that may be grounded shall comply with the provisions of 5.8.2. 6.3.6.3 Withstand voltage test: After the test in 6.36.2, a basic sinusoidal voltage with a frequency of 50IZ is applied between the live parts and the non-live metal parts of the unit for 1 minute. The test voltage value is 1500V when the single-phase rated voltage is 220V, 1800V when the three-phase rated voltage is 380V, 1.5 times the rated voltage when the three-phase rated voltage is 6000V and 10000V, 1000V for motors with a rated power less than 400W, and 500V for parts with a voltage to ground less than 30V. The test results shall comply with the provisions of 5.8.3. If the motor and other electrical equipment have been provided with a certificate of conformity by the manufacturer, this part of the equipment may be exempted from inspection during re-inspection. However, when the enclosed motor is cooled by refrigerant, a withstand voltage test shall be carried out using a 0.8 times test voltage value. In addition, within the voltage range of the control circuit, in the control circuit with a DC voltage to ground of less than 30V, the electronic components used may be exempted from this withstand voltage test.
6.3.6.4 Starting current test: After the unit has been operated under the test conditions in 6.3.3.1, the unit shall be operated at rated current of 9
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