Experimental Study on the Performance of Waterless Floor Heating and Hot Water Dual Supply Air-Source Heat Pump System

A new type of air-source heat pump system is proposed, combining domestic hot water and waterless floor heating that is achieved by the direct condensation of the refrigerant in buried pipes. The high-temperature refrigerant is exchanged in the wrapped coil water heater to produce domestic hot water. The prototype was assembled and tested in three modes: standalone floor heating, dual supply, and standalone domestic hot water. The experimental results show that in all three cases, the surface temperature of the floor was maintained between 25 ℃ and 33 ℃, and the air temperature was maintained between 18 ℃ and 22 ℃. Due to the heat storage effect of the capillary floor, the air temperature in the room remained above 18 ℃ within 113-245 min after terminating the system. At an ambient temperature of -5 ℃, after 572.3 min, the water temperature of the water heater rose to 45 ℃. The minimum system heating capacity and energy efficiency ratio (EER) can reach 2.70 kW and 3.55, respectively.