Air conditioner and its defrosting method

Abstract

The invention discloses an air conditioner and a defrosting method thereof. The defrosting method for the air conditioner includes steps that 1) enabling the air conditioner to run in a heating mode, and detecting the tube temperature TB of an outdoor heat exchanger of the air conditioner; 2) when the running time of the air conditioner arrives at a first preset time, and TB is less than or equal to TA, controlling the air conditioner to start the primary defrosting, recording the defrosting time t1, wherein TA is a defrosting tube temperature; 3) recording the defrosting time of the n times as tn, when the running time of the air conditioner arrives at the first preset time, and TB is less than or equal to TC after the n times of defrosting, controlling the air conditioner to start the n+1 times of defrosting, recording the defrosting time as tn+1, wherein TC is a revised tube temperature, and n is more than or equal to 1. According to the defrosting method for the air conditioner, the defrosting tube temperature TA is revised before each time of defrosting, and then the dynamic revising for the defrosting tube temperature TA is realized, the frost situation can be precisely obtained, the defrosting effect is improved, and the influence to the heating effect of the air conditioner is lowered.

Description

technical field [0001] The invention relates to the technical field of air conditioner defrosting, and more specifically, relates to an air conditioner and a defrosting method thereof. Background technique [0002] When the air conditioner is running in heating mode, frost will form on the outdoor heat exchanger. When the outdoor heat exchanger is frosted, it is usually necessary to remove the frost on the outdoor heat exchanger, which is currently achieved by defrosting. [0003] At present, the defrosting method of the air conditioner is: timing defrosting to complete the defrosting of the air conditioner. Specifically, when the running time of the air conditioner reaches the preset time and the tube temperature of the outdoor heat exchanger reaches the preset temperature, the air conditioner starts to defrost; When the running time of the air conditioner reaches the preset time and the tube temperature of the outdoor heat exchanger reaches the preset temperature), defro...

AI Technical Summary

Problems solved by technology

[0004] However, the above-mentioned defrosting method has the following problems: if the relative humidity of the outdoor air is small, when the operating time of the air conditioner reaches the preset time and the tube temperature of the outdoor heat exchanger reaches the preset temperature, there will be little frosting on the outdoor heat exchanger. Or there is basically no frost, but the air conditioner will still defrost at this time; if the outdoor air humidity is high, when the operating time of the air conditioner reaches the preset time and the tube temperature of the outdoor heat exchanger reaches the preset temperature , the frost on the outdoor heat exchanger is relatively thick, if defrosting is performed at this time, it is more likely to appear unclean defrosting

Then the above defrosting method has the problem of "frequent defrosting" or "incomplete defrosting", which leads to poor defrosting effect and seriously affects the heating effect of the air conditioner.

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