低温空气制冷系统性能数值模拟

Simulation study on the performance of air cycle refrigeration system

采用集总参数法建立升压式低温空气制冷系统的数学模型,并用EES软件编制计算机程序,对系统性能进行模拟,分析压气机进口压力和回热器对系统性能和除湿效果的影响。结果表明:在系统中增加一级回热器可大幅提高系统的制冷量和COP,COP最多可提高约44%;而在系统中增加二级回热器可大幅提高系统的除湿效率,最大除湿效率约为47.6%,但对提高系统制冷量和COP效果不大;压气机进口压力的升高可大幅提高系统的制冷量和COP,而制冷温度的升高会导致涡轮进口空气的含湿量增加。

In this paper the mathematical model of the bootstrap low temperature air cycle refrigeration system was established using lumped parameter method. The performance of the system was simulated using the software programmed with EES. The effects of the inlet pressure of the compressor and the recuperator on the performance of the system and dehumidification were analyzed. The simulation results show that the refrigerating capacity and COP of the system can be significantly improved by using the primary recuperator in the system, and the maximum increment of the system COP is about 44%. The dehumidification effi- ciency can be significantly improved by using the secondary recuperator in the system, and the maximum dehumidification efficiency of the system is about 47.6%, but it has a little effects on the increment of the refrigerating capacity and COP of the system to the secondary recuperator. The rise of the inlet pressure of the compressor can increase the refrigerating capacity and COP of the system. The air humidity ratio of the turbine inlet increases with the rise of the refrigeration temperature.