Air source heat pump spray defrosting device based on superhydrophobic finned tube heat exchanger

Abstract

An air source heat pump spray defrosting device based on a super-hydrophobic finned tube heat exchanger, comprising a refrigerant loop, a hot water loop, and an air loop. The refrigerant loop comprises a compressor (1), a four-way valve (2), a first heat exchanger (3), a first check valve (4-1), a second check valve (4-2), a third check valve (4-3), a fourth check valve (4-4), a first solenoid valve (5-1), a second solenoid valve (5-2), a liquid reservoir (6), a desiccant filter (7), an electronic expansion valve (8), a finned tube heat exchanger (9), a gas-liquid separator (10), and a heating-type water storage tank (12). The hot water loop comprises the heating-type water storage tank (12), a filter (13), a water pump (14), a nozzle (15), an electric heating tape (16), a water collection pan (17), a three-way valve (18), a temperature sensor (19), and a liquid level sensor (20), wherein a three-way valve first input end (18a), a three-way valve first output end (18b), and a three-way valve second output end (18c) are provided on the three-way valve (18). The air loop comprises the finned tube heat exchanger (9) and a fan (11). Said device spends less time and consume less heat for defrosting, so that continuous heat supply during the defrosting can be realized, and the heat supply time and the heat supply efficiency of the heat pump system are improved.

Description

technical field [0001] The invention belongs to the technical field of design and manufacture of refrigeration and air-conditioning systems, and relates to an air source heat pump spray defrosting method based on a superhydrophobic finned tube heat exchanger and a device for realizing the method. Background technique [0002] Air source heat pumps take into account both refrigeration and heating, and have the advantages of high comprehensive utilization efficiency of primary energy, energy saving, environmental protection, and low initial investment. The vigorous promotion of air source heat pumps is of great significance to improve the comprehensive utilization efficiency of energy in my country and realize energy saving and emission reduction. The biggest problem in the heating operation of air source heat pumps in winter is the frost on the surface of the outdoor fin tube heat exchanger. With the growth of the frost layer between the fins of the heat exchanger, the heat t...

AI Technical Summary

Problems solved by technology

During the reverse cycle defrosting process, due to the frequent reversing of the four-way valve, the compressor of the refrigeration system will appear "running oil", which will reduce the reliability and service life of the compressor; during defrosting, the refrigerant needs to absorb heat from the heating system. Because of defrosting, the temperature of the heating system fluctuates sharply, which affects the thermal comfort of the heating room

The heat of hot gas bypass defrosting mainly comes from the power consumption of the compressor, the defrosting speed is relatively slow, and it is easy to cause the compressor to absorb liquid during the defrosting process

When the existing defrosting method is used to defrost, the heat pump unit needs to interrupt the heating for defrosting, which makes the heat supply of the unit discontinuous, and the melting of the frost layer on the surface of the evaporator and the evaporation of retained water consume a lot of heat and time during the defrosting process, resulting in It is difficult to improve the defrosting efficiency

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