Frosting judgment method of air-cooled heat pump air conditioner

Abstract

The invention discloses a frosting judgment method of an air-cooled heat pump air conditioner. The method comprises steps as follows: an outdoor fan is normally started, and current first running power of the outdoor fan is detected and recorded; heating running is performed; outdoor environment temperature is detected and compared with set temperature; when the outdoor environment temperature is smaller than the set temperature, whether a current rotating speed of the outdoor fan is equal to the maximum rotating speed for heating running is judged; when the current rotating speed is equal to the maximum rotating speed for heating running, current second running power of the outdoor fan is detected, and whether the second running power is larger than N times of the first running power is judged; and when the second running power is larger than N times of the first running power, defrosting running is performed. According to the frosting judgment method of the air-cooled heat pump air conditioner, the defrosting time is accurately mastered, the problem that the heating effect becomes poor or the indoor temperature fluctuates more wildly is avoided, and meanwhile, the use comfort degree and the operating energy efficiency of the air-cooled heat pump air conditioner are further improved.

Description

technical field [0001] The invention relates to the technical field of air-cooled heat pump air conditioners, in particular to a method for judging frost formation of air-cooled heat pump air conditioners. Background technique [0002] The existing air-cooled heat pump air conditioner is easy to frost on the outdoor heat exchanger when heating at low temperature. With the thickening of the frost layer, the heat transfer capacity of the outdoor heat exchanger gradually decays, resulting in the heating effect of the air-cooled heat pump air conditioner getting worse. When the frost layer reaches a certain level, it may even cause the indoor unit to blow cold air or damage the compressor due to liquid return. Therefore, the air-cooled heat pump air conditioner must perform defrosting operation at an appropriate time to remove the frost on the outdoor heat exchanger to restore its heat exchange capacity and ensure the reliable heating effect of the air-cooled heat pump air condi...

AI Technical Summary

Problems solved by technology

But these two frosting judgment methods all have certain shortcomings.

[0005] First of all, the defrosting operation is performed every fixed time, and the actual frosting condition of the outdoor heat exchanger cannot be judged. It is only the mechanical timing defrosting, and the defrosting operation when the outdoor heat exchanger has little or no frosting cannot be avoided. , causing waste of electric energy and adversely affecting the heating effect

[0006] Secondly, by detecting the temperature of a certain position in the outdoor heat exchanger to determine whether to enter the defrosting operation mode, it is only based on the collected temperature of a certain position of the outdoor heat exchanger to determine the frosting situation, and in many cases it does not It is impossible to accurately determine the actual frosting state of the outdoor heat exchanger, which leads to the timing of defrosting earlier or later. It is also impossible to avoid the defrosting operation of the outdoor fan when there is little or no frosting, resulting in waste of electric energy and poor heating effect. , it is also impossible to avoid the problems of excessive frosting on the outdoor heat exchanger and insufficient defrosting, and poor heating effect of the air-cooled heat pump air conditioner

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