Air-conditioner defrosting control method and control device and air-conditioner

Abstract

The invention provides an air-conditioner defrosting control method. The air-conditioner defrosting control method comprises the following steps that when the outdoor environmental temperature is higher than 0 DEG C and lower than 5 DEG C, an air-conditioner works in a heating mode, and whether defrosting conditions are met or not is judged; if the defrosting conditions are met, the air-conditioner enters a defrosting mode, the defrosting mode is that a frequency of a compressor is controlled to be a defrosting frequency, and meanwhile, an aperture of an electronic expansion valve is controlled to be a defrosting aperture to enable the surface temperature of an outdoor heat exchanger to be kept at 0 DEG C; and the defrosting frequency is lower than the real-time operational frequency of the compressor in the heating mode, the defrosting aperture is larger than the real-time aperture of the electronic expansion valve in the heating mode, and the air-conditioner keeps operating the defrosting mode till the situation that an exit condition is met is judged. Meanwhile, an air-conditioner defrosting control device and an air-conditioner are further disclosed. According to the air-conditioner defrosting control method, switching between the heating mode and a refrigeration mode is not needed in the defrosting process, defrosting is conducted by using air heat, and the air-conditioner defrosting control method has the advantages that energy consumption is low, and user experience is good.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to an air conditioner defrosting control method, an air conditioner defrosting control device and an air conditioner. Background technique [0002] When the moisture contained in the air contacts the heat transfer surface whose temperature is lower than the triple point of water, it will adhere to the heat transfer surface and form frost. The frost layer is formed by the mixture of ice and air. According to the research of the prior art, under the frosting condition, the frost layer on the surface of the heat exchanger will increase the heat transfer resistance and flow resistance. When using the air conditioner in winter and working in the heating condition, because the outside temperature is very low, if the air humidity reaches a certain level, the heat exchange surface of the air conditioner's outdoor heat exchanger is easy to frost, which further seriously affects the ...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a defrosting control method of an air conditioner, which is used to solve the problem in the prior art that the air conditioner needs to operate in the cooling mode for a short time during the defrosting operation, and the indoor air supply temperature drops significantly.

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