Integration Study On High Temperature Heat Pump System Of Air-Soil Composite Heat Source

A new air-soil heat source high-temperature heat pump system is proposed based on the theory of “energy-to-mouth,cascade utilization”.Different heat sources bring into the corresponding evaporator to reduce the mixed entropy production caused by the simple superposition of different heat sources.The heat pump model of 30 k W heat capacity was designed and developed.The thermodynamic model of air source heat pump,ground source heat pump and air-soil compound heat source heat pump were set up,and the heating performance and operating characteristics of three heat pumps in typical conditions in winter were set up.The results show that the COP of the compound heat source heat pump is higher than that of the single air source heat pump,and can solve the problem of soil heat and heat imbalance of the ground source heat pump in cold regions,and has better economy in the whole heating season.The experimental platform of the air-soil heat source heat pump system was established.The operating characteristics of the new air-soil heat source heat pump unit were tested,and the high heating coefficient was also obtained at very low temperature.Under-20? environment,the hot water outlet temperature of the heat pump unit is65?,and the COP is more than 2.3.The compound heat source heat pump can deal with the fluctuation of the ambient temperature well.The fluctuation of the hot water temperature is smaller than the ambient temperature.This topic set up the foundation for the further research of the high temperature heat pump system of compound heat source,and also provides the theoretical reference for the design of the heating system of the compound heat source high temperature heat pump system.