Performance optimization of regenerated Brayton heat pump based on ecological coefficient of performance criterion

doi:10.11949/0438-1157.20191314

Abstract

Abstract:

Due to the destruction of the ozone sphere by chlorofluorocarbon (CFC) and the pressure of environment protection, the traditional vapor-compression heat pump using CFC as working fluid is increasingly restricted. Brayton heat pump, of which working fluid is environmental-safe air has been paid more attention. The Brayton heat pump cycle is one of the most important air heat pump cycles. In this paper, a performance analysis and optimization of a regenerated Brayton heat pump cycle has been carried out by taking the ecological coefficient of performance (ECOP), i.e., the ratio of heat load to the loss rate of availability (or entropy generation rate), as the optimization objective. The irreversibilities considered in the analysis include the finite heat transfer rate in the hot- and cold-side heat exchangers and the regenerator, the non-isentropic compression and expansion losses in the compressor and expander, and the heat leakage. The maximum of the ecological performance criterion and the corresponding optimal conditions have been derived analytically. The effects of the temperature of the working fluid on the performance of this cycle have been investigated. The influences of the effectiveness of the regenerator as well as the hot- and cold-side heat exchangers, the isentropic efficiencies of the compressor and expander on the ECOP are examined and shown by numerical examples.

Key words: heat pump, Brayton, regenerated, ecological

摘要：

鉴于工业发展与环境保护之间的矛盾愈发尖锐，对于空气源热泵的研究亦愈发受到重视。针对不可逆回热式布雷顿热泵，以制冷量与循环熵产之比（ECOP）为优化目标，进行了系统性能优化与分析。该系统的优化分析过程充分考虑了不可逆度，冷/热边换热器、回热器的有限换热效率，压缩机、膨胀机的非等熵压缩/膨胀损失以及系统热损等因素，通过理论分析与数值推导，得出了生态学性能系数最优条件下的系统运行匹配参数关系。

关键词: 热泵, 布雷顿, 回热式, 生态学

CLC Number:

TK 123

Jie XU, Jun WANG, Liping PANG, Meng LIU. Performance optimization of regenerated Brayton heat pump based on ecological coefficient of performance criterion[J]. CIESC Journal, 2020, 71(S1): 46-50.

徐捷, 王浚, 庞丽萍, 刘猛. 回热式布雷顿热泵的生态学性能优化研究[J]. 化工学报, 2020, 71(S1): 46-50.

Figures/Tables 4

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