Experimental Investigation of a Novel Air Source Heat Pump for Cold Climate

摘要

In order to improve air-source heat pump's heating capacity in cold climate,this paper presents a novel system,which integrates the compressor heat recovery unit into the two-stage compression cycle and is supplemented by the low-pressure vapor feeding unit.Thus the low temperature adaptability of the system is greatly enhanced.A prototype whose standard heating capacity is 8 kW is designed and a series of tests are conducted,in which the ethylene glycol solution loop is used to simulate outdoor environment.The experimental results show that the system is capable of providing 50 °C heating hot water when outside temperature is -20 °C,while the COP is 1.76; The heating capacity of the system is 4.71 kW and the exhausted temperature of the compressor is below 100 °C.