When the air conditioner is in heating mode, the surface temperature of the evaporator will reach below zero, and the surface of the evaporator may frost. The thick frost layer will hinder the air flow and affect the heating capacity of air conditioners, so all air conditioners are equipped with defrosting circuits.
When the outdoor unit is in defrosting mode, the outdoor unit will drip water, and at the same time, the indoor unit will stop blowing hot air. After defrosting, the outdoor unit no longer drips water and emits hot air. The indoor unit resumed blowing hot air, the frost melted, the temperature of the display gradually increased, and the air conditioner heated again. So back and forth.
The principle of extended data air conditioning heating
The low-pressure gas sucked by the compressor is compressed into high-temperature and high-pressure gas by the compressor, and the high-temperature gas raises the water temperature through the heat exchanger, and at the same time, the high-temperature gas will condense into liquid.
The liquid evaporates when it enters the evaporator (the evaporator also needs heat exchange medium, and the model and structure of the machine are different according to the different heat exchange medium. Air cooling and ground source are usually used. After the liquid passes through the evaporator, it becomes low-pressure and low-temperature gas, and the low-temperature gas is sucked by the compressor again for compression.
Baidu encyclopedia-air conditioning defrosting
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