高温热泵跨临界循环最优压力的理论分析

优化控制跨临界循环高压,是保证系统高效、稳定运行的关键。文中以HFC125为模拟工质,通过一个基本跨临界循环,得到了不同工况下各个循环参数与高温热泵跨临界循环高压之间的关系。根据结果发现,在一定工况下,高温热泵系统存在一个最优循环压力,最优循环压力主要受蒸发温度、冷凝器出口温度、过冷度和压缩机性能的影响。应调节此临界循环尽可能在最优压力附近工作。

Theoretically analysis on the heat rejection pressure in transcritical HFC125 high temperature heat pump

The optimal control of the high heat rejection pressure and system charge is the key of keeping the system to work stably and efficiently in the high temperature transcritical heat pump system.Through a basic transcritical circle as refrigerant of HFC125,the relationship between the circulation parameters in the different conditions and the high prssure of high temperature heat pump was obtained.Results show that there is an optimum circulation pressure in the pump,and it is decided by the evaporation temperature,the outlet temperature of condenser,subcooling degree and compressor performances.