A control method for heat pump air conditioner defrosting

Abstract

The invention discloses a defrosting control method for a heat pump air conditioner. The solution is: in the heating operation, first set the compressor continuous operation time T n , when the compressor runs continuously for T n When the set value is reached, the air conditioning system enters the defrosting mode and records the defrosting time t, which is characterized in that the compressor’s continuous running time T in the next cycle n+1 It is determined according to the defrosting time t in the previous cycle. The invention can reasonably defrost and improve the heating effect of the air conditioner.

Description

technical field [0001] The invention relates to a method for defrosting an air conditioner, in particular to a method for controlling the defrosting of a heat pump air conditioner. Background technique [0002] When the air conditioning system is in heating operation, the outdoor heat exchanger acts as an evaporator to absorb heat from the outdoor environment, and its evaporation temperature is lower than the outdoor ambient temperature. When the evaporation temperature is lower than the freezing point of the outdoor environment, the water vapor in the air will The surface of the heat exchanger condenses and frosts. The frosting of the heat exchanger will increase the resistance of the air flowing through the heat exchanger and reduce the air flow. The frosting of the heat exchanger will also increase the heat transfer resistance, which will reduce the outdoor temperature. The heat absorbed by the heat exchange will make the heating effect worse. Therefore, when the air cond...

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Problems solved by technology

[0002] When the air conditioning system is in heating operation, the outdoor heat exchanger acts as an evaporator to absorb heat from the outdoor environment, and its evaporation temperature is lower than the outdoor ambient temperature. When the evaporation temperature is lower than the freezing point of the outdoor environment, the water vapor in the air will The surface of the heat exchanger condenses and frosts. The frosting of the heat exchanger will increase the resistance of the air flowing through the heat exchanger and reduce the air flow. The frosting of the heat exchanger will also increase the heat transfer resistance, which will reduce the outdoor temperature. The heat absorbed by the heat exchange will make the heating effect worse, so when the air conditioning system is in heating operation, if the outdoor heat exchanger frosts, it should be defrosted

[0003] The defrosting of the air conditioning system generally turns the air conditioner into cooling mode and turns off the indoor unit fan to defrost. During defrosting, the air conditioner cannot provide heat to the room and consumes power

In addition, the air conditioner defrosts too frequently and consumes too much electric energy for defrosting operation, which will also cause intermittent heating, room temperature fluctuations, and long-term non-defrosting, and the heat exchange effect of the outdoor heat exchanger is poor. It will also lead to poor heating effect

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