热阻和内不可逆性对闭式回热式布雷顿热泵循环性能的影响

Effects of Heat Resistance and Internal Irreversibility on the Performance of Closed Regenerated Brayton Heat Pump Cycles

用有限时间热力学方法分析实际热泵循环性能，计入工质与高、低温热源间换热器和回热器的热阻损失，压缩机和膨胀机中的不可逆损失，和管路系统中的压力损失，导出恒温和变温热源条件下实际闭式回热式布雷顿热泵循环的供热率、供热系数与压比间的解析式。

erformance analysis of real heat pump cycles has been performed using finite time thermodynamics in this paper. The relations between heating load and pressure ratio, and between COP and pressure ratio of irreversible closed regenerated Brayton heat pump cycles with constant and variable temperature heat reservoirs are derived. In the analysis, the irreversibilities involve the heat resistance losses in the high and low temperature side heat exchangers and the regenerator, the nonisentropic expansion and compression losses in the expander and compressor, and the pressure drop loss in the pipe and system. The influences of various losses on the cycle performance are illustrated using detailed numerical examples.