Exergy analysis of R1234ze（Z） as high temperature heat pump working fluid with multi-stage compression
Exergy analysis of R1234ze（Z） as high temperature heat pump working fluid with multi-stage compression作者机构：Institute of Refrigeration and Cryogenics Shanghai Jiao Tong University Shanghai 200240 China
出 版 物：《Frontiers in Energy》 (能源前沿（英文版）)
年 卷 期：2017年第11卷第4期
页 面：493-502页
核心收录：
学科分类：08[工学] 0813[工学-建筑学] 0814[工学-土木工程]
基 金：supported by the National Key R&D program of China
主 题：multi-stage compression high temperatureheat pump heat recovery exergy destruction,R1234ze(Z) working fluid
摘 要：In this paper, the simulation approach and exergy analysis of multi-stage compression high tempera- ture heat pump （HTHP） systems with R1234ze（Z） working fluid are conducted. Both the single-stage and multi-stage compression cycles are analyzed to compare the system performance with 120℃ pressurized hot water supply based upon waste heat recovery. The exergy destruction ratios of each component for different stage compression systems are compared. The results show that the exergy loss ratios of the compressor are bigger than that of the evaporator and the condenser for the single-stage compres- sion system. The multi-stage compression system has better energy and exergy etticiencies with the increase of compression stage number. Compared with the single- stage compression system, the coefficient of performance （COP） improvements of the two-stage and three-stage compression system are 9.1% and 14.6%, respectively. When the waste heat source temperature is 60℃, the exergy efficiencies increase about 6.9% and 11.8% for the two-stage and three-stage compression system respec- tively.
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