GB/T 14909-1994 Technical guidelines for exergy analysis in energy utilization

This standard specifies the principles for analyzing energy systems. This standard applies to any process, equipment, process flow or system involving energy utilization or energy conversion. GB/T 14909-1994 Technical Guidelines for Exergy Analysis Methods in Energy Utilization GB/T14909-1994 Standard download decompression password: www.bzxz.net

urh:620.93:536
National Standard of the People's Republic of China
GB/T14999-94
Technical guides for exergy analysisTechnical guides for exergy analysis1994-01-05Published
Implementation on 1994-10-01
Published by the State Bureau of Technical Supervision
National Standard of the People's Republic of China
Technical guides for exergy analysis1Subject content and applicable scope
CH/T14909-94
This standard specifies the principles of exergy analysis. This standard applies to any process, equipment, technological process or system involving energy utilization or energy conversion. Www.bzxZ.net
2 Basic concepts and terms
2.1 System
A system is an object of analysis with clear boundaries determined by the research process. Based on the same concept, the system can also be divided into two or more "subsystems". 2.1.1 Closed system
A system without material passing through its boundaries is called an open system or a closed system. 2.1.2 Open system
A system with material passing through its boundaries is called an open system or a slew system. 2.1.3 Steady-flow system syster is an open system with substances passing through each point on the boundary whose properties do not change at any time. 2.2 Cyclopentanecnvironmcnt
The system boundary is collectively called the other boundary. The environment is part of the outside world. The environment is a specific ideal outside world, composed of selected reference compounds (also called reference compounds) in the atmosphere, surface and sea bombs in a completely balanced state. 2.3 Reversible process and irreversible process reversibleproceseandireversiblepracess system After the system changes, the process of the system and the external environment returning to their original state is called a reversible process; otherwise, it is called an irreversible process.
In a reversible process where the system and the external environment interact with each other to achieve a state of equilibrium with the environment, the maximum useful work done on the outside world is called the system's work in this state.
The reduction in the system's work due to the irreversibility of the process is called the system's loss. It can be divided into internal loss and external loss.
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