Air source heat pump with detachable defrosting device based on superhydrophobic fin heat exchanger and its working method

Abstract

The invention discloses an air source heat pump with a detachable defrosting device based on a super-hydrophobic fin heat exchanger and a working method thereof. The air source heat pump includes a gas-liquid separator, a compressor, a four-way commutator, a first heat exchanger, a second heat exchanger, a first fan, a liquid storage branch, a defrosting water circuit, and a defrosting refrigerant delivery branch. The defrosting water circuit includes a defrosting device, a first solenoid valve, and a second solenoid valve; the defrosting refrigerant delivery branch is installed between the refrigerant output end of the compressor and the first heat exchanger, and the defrosting cooling An electric regulating valve is installed on the agent delivery branch; the defrosting device is located below the first heat exchanger, and the frost layer condensed on the fin surface of the first heat exchanger can just fall off into the defrosting device; the defrosting device melts the frosting layer The heat comes from the heat released by the subcooling of the refrigerant output from the refrigerant delivery channel inside the second heat exchanger. In the defrosting process of the present invention, the frost layer on the surface of the fins falls off as a whole, which greatly reduces the defrosting time and effectively reduces the energy consumption of defrosting.

Description

technical field [0001] The invention relates to an air source heat pump with a detachable defrosting device based on a super-hydrophobic fin heat exchanger, and belongs to the technical field of refrigeration / heating air-conditioning systems. [0002] The present invention also relates to a working method of the above-mentioned air source heat pump. Background technique [0003] Air source heat pumps take into account both cooling and heating functions, and have the advantages of safety and high efficiency, energy saving and environmental protection, small footprint and low initial investment. The vigorous promotion of air source heat pumps is of great significance to the realization of energy saving and emission reduction. However, under cold climate conditions, there is a problem of frosting on the surface of the outdoor finned tube heat exchanger during the heating operation of the air source heat pump in winter. As the frost layer on the surface of the heat exchanger f...

AI Technical Summary

Problems solved by technology

The reverse defrosting method uses the four-way reversing valve in the system to change the heat transfer direction of the system to achieve the purpose of defrosting. Therefore, the four-way reversing valve in the system is switched frequently, causing the system compressor to "run oil"; at the same time , during the defrosting process, the indoor heat exchanger absorbs heat from the room, resulting in a decrease in the indoor temperature and large fluctuations, and a decrease in the comfort of the heating effect of the system; at the same time, the switching of the four-way reversing valve causes large fluctuations in the pressure in the system, It is not conducive to the internal stability of the system, resulting in long defrosting time and high energy consumption; frequent switching of the four-way reversing valve also reduces the life of the four-way reversing valve and affects the use effect

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