Experiments of transcritical CO_2 heat pump water heater

In order to improve the efficiency of heat pump water heater,a laboratory table of CO2 heat pump water heater is built.The results of experiment showed that the COP of CO2 heat pump water heater rises with the temperature of evaporation increasing when the temperature of cooling water is 65℃.Under a certain temperature of evaporating,the heat release of gas cooler increases with the high pressure increases firstly and then reduces,and the COP of system exists a most value.