Defrosting control method and system and air conditioner

Abstract

The invention provides a defrosting control method and system and an air conditioner. The defrosting control method comprises the following steps that a system parameter is detected by the air conditioner under a heating mode; if the system parameter reaches the preset defrosting condition, a stop valve is controlled to close, and an electric heating piece works; and the heat accumulator temperatures of the time when the electric the heating piece stars working and during first preset duration are respectively recorded to be T0 and Ti, if the temperature difference of the heat accumulator is not larger than the preset temperature difference, the electric heating piece is controlled to stop working, the stop valve is started, a four-way valve is reversed to enable the air conditioner to defrost under a refrigerating mode, or else, defrosting is finished. According to the defrosting method provided by the invention, the air conditioner defrosts under the refrigerating mode, the good defrosting effect and good heating effect are ensured, and using comfort of a user is promoted; and when the temperature of the heat accumulator slowly rises, and heat of a heat storage assembly cannot meet the defrosting requirements of the air conditioner under the heating mode, the four-way valve is reversed to enable the air conditioner to defrost under the refrigerating mode, normal defrosting of the air conditioner is ensured, and the using satisfaction degree of the user is improved.

Description

Technical field [0001] The present invention relates to the technical field of air conditioners, in particular to a defrosting control method, a defrosting control system and an air conditioner. Background technique [0002] The air conditioner in the related art usually uses the discharge temperature of the compressor for hot gas frosting. When the defrosting starts, the four-way valve reverses to make the outdoor heat exchanger radiate heat, and the indoor heat exchanger absorbs heat, resulting in indoor ambient temperature In this way, in a colder environment, the air conditioner runs the refrigeration cycle, which will cause the room temperature to be hot and cold, affecting the comfort of the user; and during the defrosting process, the frost on the lower part of the outdoor heat exchanger is difficult to remove. When the upper part has been defrosted, it must wait until the lower part of the outdoor heat exchanger is completely defrosted before it can complete the defrost a...

AI Technical Summary

Problems solved by technology

[0002] The air conditioner in the related art usually uses the discharge temperature of the compressor to perform hot air defrosting. When defrosting starts, the four-way valve is reversed so that the outdoor heat exchanger releases heat, and the indoor heat exchanger absorbs heat, resulting in indoor ambient temperature. In this way, in a colder environment, the air conditioner runs a refrigeration cycle, which will cause the room temperature to be hot and cold, affecting the comfort of the user; When the upper part has been defrosted, it must wait until the lower part of the outdoor heat exchanger is completely defrosted to complete the defrosting and enter the normal heating operation state at the same time, so part of the heat is wasted and the defrosting process is prolonged. Reduced heating capacity and reduced overall heating effectiveness

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