Method for defrosting air conditioning unit and air conditioning unit

Abstract

The invention provides a method for defrosting an air conditioning unit and the air conditioning unit. The method for defrosting the air conditioning unit comprises the steps that (1) the environment temperature T1 and the air absorption temperature T2 of a compressor of the air conditioning unit are detected; (2) when T2 is smaller than T3 and the running time t1 of the compressor is longer than the first preset time, if T4 is smaller than T1 and T1 is smaller than T5, the compressor is controlled to stop operating, a fan of an outdoor unit is controlled to operate, defrosting operation conducted by the fan is started, and after the fan is operated for the second preset time, defrosting operation is stopped, wherein T3 is the first preset temperature, T4 is the second preset temperature, and T5 is the third preset temperature. According to the method for defrosting the air conditioning unit, the compressor is controlled to stop operating, the fan of the outdoor unit is controlled to operate to conduct defrosting operation, the temperature of hot water in an indoor heat exchanger cannot be reduced in the defrosting process, and therefore the energy consumption amount of air conditioning unit heating is reduced. Meanwhile, in the defrosting process, the compressor stops operating and the energy consumption amount in the defrosting process is reduced.

Description

technical field [0001] The invention relates to the technical field of air-conditioning defrosting, and more specifically, relates to a method for defrosting an air-conditioning unit and the air-conditioning unit. Background technique [0002] When the air conditioner is heating, the outdoor heat exchanger (usually a finned heat exchanger) will frost when its surface temperature is lower than 0°C, and the frost layer will affect the heating effect, so the air conditioner runs for a period of time. need defrosting afterwards. [0003] At present, the method of switching the four-way valve is usually used for defrosting, and the high-temperature and high-pressure gas discharged from the compressor enters the outdoor heat exchanger, thereby melting the frost layer on the surface of the outdoor heat exchanger. During the defrosting process, the outdoor heat exchanger is a condenser, and the indoor heat exchanger is an evaporator, so the hot water generated by the indoor heat ex...

AI Technical Summary

Problems solved by technology

During the defrosting process, the outdoor heat exchanger is a condenser, and the indoor heat exchanger is an evaporator, so the hot water generated by the indoor heat exchanger during the heating process is cooled. The hot water in the water is heated, which leads to a large energy consumption when the air conditioning unit is heated.

[0004] In addition, during the defrosting process, the compressor is turned on, which increases energy consumption

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