Air source CO
View Patent ↗The present disclosure relates to the technical field of heat pumps, in particular to an air source CO 2 heat pump system for preventing an evaporator from frosting by using heat of a heat regenerator. The air source CO 2 heat pump system mainly includes an air source heat pump system, a regenerative heat exchange tank and a cooling pump. Through the regenerative heat exchange tank, on the one hand, the temperature drop of regenerative heat of the system is further increased and throttling loss is reduced; on the other hand, the heat generated by the regenerative temperature drop is configured for heat storage used for defrosting, and configured for overheating temperature rise.
1. An air source CO 2 heat pump system for preventing an evaporator from frosting by using heat of a heat regenerator, comprising an air source heat pump system, a regenerative heat exchange tank and a cooling pump; the air source heat pump system comprises a compressor, a gas cooler, an expansion valve, an air-cooled evaporator, a drying filter and a gas-liquid separator; a tank body of the regenerative heat exchange tank is filled with a phase change material, a tube-in-tube internal heat exchanger and a cooling liquid heat exchange tube of single-spiral finned tube type are provided within the tank body of the regenerative heat exchange tank, the tube-in-tube internal heat exchanger and the cooling liquid heat exchange tube of single-spiral finned tube type are arranged at intervals in a spiral mode; and an inner tube is arranged in the tube-in-tube internal heat exchanger;
an outlet of the gas cooler is connected with a high-pressure fluid inlet of the tube-in-tube internal heat exchanger in the regenerative heat exchange tank, and a low-pressure fluid outlet of the tube-in-tube internal heat exchanger in the regenerative heat exchange tank is connected with an outlet of the gas cooler through the gas-liquid separator and the compressor;
a cooling liquid inlet of the cooling liquid heat exchange tube of single-spiral finned tube type in the regenerative heat exchange tank, a high-temperature cooling liquid channel of the air-cooled evaporator and a cooling liquid outlet of the cooling liquid heat exchange tube of single-spiral finned tube type form a cooling liquid circulation circuit, and the cooling pump is arranged at the cooling liquid circulation circuit close to the cooling liquid outlet;
a high-pressure fluid outlet of the tube-in-tube internal heat exchanger in the regenerative heat exchange tank, a refrigerant channel of the air-cooled evaporator and a low-pressure fluid inlet of the tube-in-tube internal heat exchanger form a low-pressure heat regeneration circulation circuit; and the drying filter and the expansion valve are arranged in sequence at the low-pressure heat regeneration circulation circuit close to the high-pressure fluid outlet.
2. The air source CO 2 heat pump system according to claim 1 , wherein the phase change material is paraffin.