Air conditioner frost control method

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner frosting control method. In order to ensure frosting uniformity of an air conditioner to improve the defrosting efficiency, a provided air conditioner defrosting control method is directed to an air conditioner provided with dual fans on an outdoor unit. The method includes the following steps that during heating operation of the air conditioner, the temperature of an outer coil is detected; in the case where the temperature of the outer coil is lower than a dew point temperature, the current of the upper fan and the current of the lower fan are detected every preset time; calculating is conducted according to a formula of delta I=|I upper-I lower|; if deltaI is greater than 0.01 A, and I upper> I lower, the rotation speed of the upper fan is increased by a first preset number of revolutions. Non-uniformity of temperature points of the outer coil of an outdoor heat exchanger is balanced by controlling magnitudes of wind speeds in different regions of the outer coil, and frosting uniformity is further rationally controlled, so that frosting of the outdoor unit is more uniform, and frosting uniformity is conducive to defrosting, that is, the defrosting efficiency is improved.

Description

Technical field [0001] The invention belongs to the technical field of air conditioners, and in particular relates to a method for controlling frosting of an air conditioner. Background technique [0002] As a device that can adjust the indoor ambient temperature, the working principle of the air conditioner is to reduce or increase the indoor ambient temperature through the high-pressure / low-pressure / gas / liquid state conversion of the refrigerant between the circulating pipelines. From the perspective of the indoor unit, the air conditioner is in cooling or heating mode. When the air conditioner is heating, under certain humidity conditions, if the temperature of the outdoor coil is too low, it will cause frosting, and the frosting of the outdoor coil will reduce the heat exchange efficiency of the outdoor heat exchanger, which will affect the air conditioner’s control. The thermal effect reduces the comfort of the indoor environment and affects the user experience. Therefore,...

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Problems solved by technology

[0003] Since the frosting speed and thickness of the outdoor unit are affected by the temperature of the outer coil and the wind speed, and the shunt flow of the outdoor heat exchanger cannot be completely consistent, when the wind speed is the same, the temperature of the outer coil must be inhomogeneous. It will cause uneven frosting on the outer coil, which will affect the defrosting efficiency of the air conditioner.

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