Experimental research on the performance of R1234yf heat pump system with an economizer for vehicles
In order to solve the technical problems that common heat pump air conditioner for vehicles can not achieve ultra-low temperature heating and ultra-high temperature refrigeration of the same compressor,a test bench for R1234yf heat pump system for vehicles with an economizer for replenishment was developed.The impacts of low-pressure and medium-pressure gas replenishment modes on system performance were studied at different temperatures outside the car in the experiment.The results show that at different temperatures outside vehicles,the low-pressure gas and medium-pressure gas replenishment technology can significantly improve system performance,and the medium-pressure replenishment technology improves the system performance more obviously;The exhaust temperature of both the low-pressure and medium-pressure replenishing compressor is lower than 90℃during ultralow temperature heating and ultrahigh temperature cooling;in the case of ultra-high temperature(50℃),compared with low-pressure replenishment,the cooling capacity of medium-pressure replenishment technology increases by 6.9%,and COP increases by 3.2%;in the case of ultra-low temperature(-10 and-20℃),compared with low-pressure replenishment,the heating capacity of medium-pressure replenishment technology increases by 11.1%～23.2%,and COP increases by 3.0%～3.8%;The performance of medium-pressure replenishment system is better than that of low-pressure replenishment system.
car heat pumpR1234yfeconomic instrumental replenishmentperformance
万方数据
维普
