The Effect of Ambient Temperature on the Performance of Air-source Heat Pump Water Heater System
The change of working condition puts forward higher requirements to the optimization of air source heat pump system,and the ambient temperature as an important influence parameter need a large number of experiments to find its influence rule to the air source heat pump water heater to make the corresponding control strategy.In this paper,air-source heat pump water heater experiment is carried out in different simulated ambient temperature.It could be concluded by analyzed the result that the superheat temperature decreases with the decreasing of ambient temperature,the heating capacity of the system is related to the superheat degree.The lower the superheat temperature is,the larger the heating capacity is.The heating capacity begins to drop when the superheat temperature is 0℃.Moreover,as the ambient temperature decreases,the pressure ratio of the system increases,the exhaust gas temperature rises and the superheat temperature decrease.Compressor suction liquid entrainment will increase the power consumption,but it can effectively reduce the exhaust temperature.Furthermore,the average COP of COPa is decreased with the decrease of ambient temperature.In sum,the lower the temperature is,the worse the heating effect is,and the longer the heating time is.
air sourceambient temperaturesuperheat temperaturesystem performanceexperimental study