Experimental study on the performance of the water heater of the air-source heat pump type using R415b

An experimental study on the performance of the water heater of the air-source heat pump type using R415b as working substance was carried out in this paper.Discussed in detail were variations of following operating parameters with the water temperature in the tank: the evaporation pressure,the condensation pressure,the pressure ratio,the suction temperature,the temperature downstream the condenser,the degree of superheat of the condenser,the subcooling degree of the condenser,the degree of superheat of the evaporator,and the COP.It was found that the COP of the water heater varies as the water temperature and depends on the ambient temperature and the relative humidity.Moreover,the characteristics of the water temperature rise and its relationship to other parameters for the heat pump system were investigated.