Air-conditioning system and its defrosting control method and device

Abstract

The invention discloses an air-conditioning system and its defrosting control method and device. The method includes the following steps: when the air-conditioning system defrosts each time, obtain the defrosting exit time determined in the last defrosting, and according to the above The defrosting exit time determined during the first defrosting is used to control the air-conditioning system to perform this defrosting; during the defrosting process of the air-conditioning system, obtain the outdoor ambient temperature and the outlet temperature of the outdoor heat exchanger; temperature and the outlet temperature of the outdoor heat exchanger; if the outlet temperature of the outdoor heat exchanger is lower than the first preset temperature for a preset time, and the outdoor ambient temperature is lower than the second preset temperature, the forced defrosting time is obtained to It is used as the exit time of defrosting for the next defrosting of the air conditioning system and stored. Thus, the exit time of defrosting can be adjusted according to the outdoor environment and the outlet temperature of the heat exchanger and its duration, so as to ensure the defrosting effect without affecting the heat exchange effect.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a defrosting control method for an air conditioning system, a defrosting control device for the air conditioning system, and an air conditioning system with the defrosting control device. Background technique [0002] In the air conditioning system, when the air conditioner has frost in the heating mode, it needs to switch to the cooling mode. At this time, the outdoor heat exchanger acts as a condenser to melt the frost layer. In related technologies, the defrosting process needs to set a forced exit time, so as to prevent the indoor unit from being unable to heat due to prolonged defrosting. Wherein, the exit time is generally fixed, so the length of the fixed time setting must meet the requirements of all operating environments. When the exit time is set too short, if it is affected by external rain and snow, the defrosting effect cannot be achieved, and the heat exc...

AI Technical Summary

Problems solved by technology

When the exit time is set too short, if it encounters external rain and snow weather, the defrosting cannot achieve the predetermined effect, and the heat exchanger cannot completely melt the surface frost layer

When the exit time is set too long, if the frost layer is not thick in the low temperature and low humidity environment, the defrosting can be completed in a short time, but the system parameters are difficult to meet the exit conditions, and the internal unit will fail due to the long defrosting execution time. Unable to heat, the indoor heating effect is affected

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