Equivalent Cycle and Optimization of Auto-Cascade Absorption Refrigeration Systems  

作　　者：HE Yijian CHEN Guangming 

机构地区：[1]Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province,Institute of Refrigeration and Cryogenics,Zhejiang University,Hangzhou 310027,China

出　　处：《Journal of Thermal Science》2020年第4期1053-1062,共10页热科学学报（英文版）

基　　金：financially supported by National Natural Science Foundation of China under Grant No.51206140 and No.50890184。

摘　　要：Auto-cascade absorption refrigeration(ACAR) systems are a class of new cycles that can achieve low refrigeration temperatures by utilizing low-quality thermal energy. In this study, the equivalent thermodynamic processes of a reversible ACAR system are established, and illustrated in a T-s diagram. The formula of the coefficient of performance for the reversible ACAR system is derived from the first and second thermodynamic laws. And then, the equivalent cycle of an irreversible ACAR system is established. The irreversible ACAR system is optimized by minimizing entropy generation of the thermodynamic processes. As a result, the optimum distribution ratio of heat fluxes at cascade process, which is defined as a ratio of heat fluxes between a condensing reservoir and cascade reservoir, and the optimum cascade temperature are obtained. Finally, its coefficient of performance and thermodynamic perfect degree are determined with minimum entropy generation.

关 键 词：auto-cascade absorption refrigeration equivalent cycle thermodynamic perfect degree entropy generation optimizing 

分 类 号：TB616[一般工业技术—制冷工程]