热力系统的熵分析

根据热力学第二定律,应用熵平衡法对热力系统进行分析和设计。作为实例,应用此方法分析以溴化锂—水为工质的单级制冷系统和单级热转换器系统。结果表明,熵平衡法不仅可以获得如能量法和(火用)分析法相同的结果,而且还可清晰地揭示系统中各个过程的不可逆性,对系统性能系数和效率的影响。该系数和效率仅取决于过程的性质而与环境条件无关。

Entropy Analysis of Thermal Systems

A method of entropy balance based on the second law of thermodynamices was ap- plied to analyse and design thermal systems. As an example, the entropy balance method was applied to analyse a single stage chiller system and a single stage heat transformer, both with lithium-btomide/water as the working fluid. The entropy balance method yields not on- ly the same information ad was conveyed by the methods of energy and exergy analysis, but it also predicts clearly the influemce of irreversibilities of individual components on the coeffi- cient and effectiveness of performance, both based on the process properties rather than on ambient conditions.