Air source heat pump defrosting device based on multi-effect comprehensive action at the initial stage of frosting

Abstract

The invention discloses an air source heat pump defrosting device based on a multi-effect synthetic action at an initial frosting stage. The air source heat pump defrosting device comprises a refrigerant circuit, an air circuit and a defrosting speed regulation system. At the initial frosting stage, a frost layer is sparse and short or is in a non-frozen liquid drop state, thereby being easy to remove. According to the air source heat pump defrosting device, the growing characteristics of the frost layer at the initial frosting stage are fully utilized, high-temperature, high-pressure and dry air directly acts on the finned surface of a second heat exchanger through air supply nozzles, and therefore quick defrosting with the multi-effect synthetic action including blowdown, thawing and evaporation is achieved. Meanwhile, the defrosting speed regulation system can control the acting time of the high-temperature and high-pressure air on the finned surface by changing the vertical movement speed of the air supply nozzles along the second heat exchanger so as to achieve the effect that the frost layer at different frosting degrees is completely removed. The air source heat pump defrosting device is low in defrosting energy consumption, normal heating running of a heat pump system is not influenced in the defrosting process, the heat supply time of the heat pump system is prolonged, and the heat supply efficiency of the heat pump system is improved.

Description

technical field [0001] The invention belongs to the technical field of design and manufacture of refrigerating and air-conditioning systems, and relates to an air source heat pump defrosting device based on multi-effect comprehensive effects in the initial stage of frosting. Background technique [0002] When the air source heat pump is in heating operation in winter, the evaporator has the problem of frosting. Due to the formation and growth of the frost layer, the heat exchange capacity of the evaporator is reduced, the performance of the heat pump is deteriorated, and it cannot work normally. Therefore, the air source heat pump must be defrosted in time when it operates under frosting conditions. [0003] At present, the commonly used defrosting methods include reverse cycle defrosting and hot gas bypass defrosting. During the reverse cycle defrosting process, due to the frequent reversing of the four-way valve, the compressor of the refrigeration system will appear "ru...

AI Technical Summary

Problems solved by technology

The existing defrosting methods are based on the fact that the frost layer enters the full growth stage before defrosting. In order to melt the dense frost layer and evaporate the defrosted water, a lot of heat and time are consumed, which reduces the heating time and efficiency, resulting in air source The efficiency of the heat pump decreases throughout the operating cycle

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