Superhydrophobic fin type heat exchanger based air source heat pump with detached defrosting device and working method thereof

Abstract

The invention discloses a superhydrophobic fin type heat exchanger based air source heat pump with a detached defrosting device and a working method thereof. The air source heat pump comprises a gas-liquid separator, a compressor, a four-way commutator, a first heat exchanger, a second heat exchanger, a first fan, a liquid storing branch circuit, a defrosting water loop and a defrosting refrigerating agent conveying branch circuit; the defrosting water loop comprises a defrosting device, a first electromagnetic valve and a second electromagnetic valve; the defrosting refrigerating agent conveying branch circuit is installed between the refrigerating agent output end of the compressor and the first heat exchanger, and an electric regulating valve is installed on the defrosting refrigeratingagent conveying branch circuit; the defrosting device is located under the first heat exchanger, and frost layers condensed on the surfaces of fins of the first heat exchanger can exactly fall to thedefrosting device; and the heat, for melting the frost layers, of the defrosting device is from the heat released through supercooling of a refrigerating agent output by a refrigerating agent conveying flow channel arranged on the inner side of the second heat exchanger. According to the superhydrophobic fin type heat exchanger based air source heat pump with the detached defrosting device and the working method thereof, the frost layers on the surfaces of the fins overall fall off in the defrosting process, the defrosting time is significantly shortened, and defrosting energy consumption canbe effectively reduced.

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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