三元混合工质用于变容量热泵系统的实验研究

Experimental Study on a Variable Capacity Heat Pump System with Ternary Mixture Refrigerants

简要回顾并总结了国内外关于变容量热泵系统的研究方向,在新型变浓度热泵试验台上进行了三元混合工质R23/R32/R134a变工况、变浓度等一系列的实验,并对实验结果进行了分析。结果表明:三元混合工质用于变浓度热泵系统时,单质工质之间互相弥补了各自的不足,发挥了各自的优势,在循环性能上以及容量调节方面都表现出很大的优越性;随着冬季室外温度的降低,混合工质在变浓度运行要比定浓度运行能够放缓制热量下降的节奏,表现出更节能的优点。

The research on variable capacity heat pump systems was briefly reviewed. The experiments on a new variable capacity heat pump using R23/R32/R134a were conducted under different working conditions and refrigerant concentration. The experimental results show that when ternary refiigerant mixtures are used in the variable capacity heat pump system, the member refrigerants can make up their disadvantages from each other and make a respective contribution towards the overall system performance. Moreover, the heating capacity of the system with variable compositions of the refi＇igerant mixtures will decrease more slowly than that with constant compositions when the ambient temperature decreases gradually.