航天器热泵系统辐射器性能分析

PERFORMANCE ANALYSIS OF RADIATOR OF HEAT PUMP SYSTEM FOR SPACE USE

由于航天器向外主要是以热辐射的方式散热,而辐射散热量与排热温度的4次方成正比,提出了采用热泵强化排热的概念。针对航天器热泵系统进行建模,分析了冷凝温度、出口过冷度以及工质类型与热泵系统质量变化情况。结果表明:冷凝温度及出口过冷度对系统质量有一定影响,且存在最佳值;不同工质的系统随参数变化表现趋势也不同;使用热泵的热控系统对减小航天器质量有很明显的效果。

The major way of heat rejection from spacecraft to space was heat radiation whose heat release was propor-tionate to fourth power of the temperature of the heat rejection. Regarding that,a concept of heat pump used to strengthen rejecting heat was proposed. The mathematic model of the heat pump system for spacecraft is built and we analysis the pa-rameters,such as the condensing temperature,degree of supercooling,refrigerants,influencing quality of the heat pump system.The results indicate that the condensing temperature and degree of supercooling are vital for lightening the system mass and they have the optimum value for the system. Systems use different refrigerants have different performance and the thermal control system which uses heat pump is better than those without heat pump system in lightening the system mass.