制冷工况下降膜冷凝器的制冷剂积存特性与传热性能

摘要

为探索在保证空调器性能的同时,减少制冷剂充注量的解决方案,对家用分体空调室外机的制冷剂积存量进行了实验研究,结果表明:冷凝器中两相段及过冷段的液相积存量较大,导致冷凝器内积存的制冷剂质量较多,占总充灌量的60%以上.故利用竖直管降膜冷凝来减少制冷剂积存量的思路,设计了翅片管降膜冷凝器并对其进行了实验研究,结果表明:在保证系统性能的同时,总充灌量由1050 g减少到550 g.%In order to reduce the refrigerant charging quantity while maintaining the performance of an air conditioner, the refrigerant hold-up in the condenser of a domestic air conditioner is experimentally studied. The results indicate that more than 60% of the total refrigerant charging quantity is in the condenser, since the liquid-phase hold-up in the two-phase and subcooled regions is relatively large. Therefore, a finned tube falling film condenser is proposed and employed since vertical tubes can decrease the refrigerant hold-up. Consequently, the total refrigerant charging quantity is reduced from 1050 g to 550 g while the system performance maintains stable.