Defrosting control method for fixed-frequency air conditioner

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method for a fixed-frequency air conditioner. In order to improve the defrosting efficiency of the fixed-frequency air conditioner, the defrosting control method for the fixed-frequency air conditioner comprises the following steps that under the condition that the fixed-frequency airconditioner is in a heating working condition, the external environment temperature T is detected, and the temperature of an inner coil is detected every preset time; and under the condition that T is smaller than dew point temperature, whether the fixed-frequency air conditioner enters a defrosting mode or not is judged according to the decay speed of the temperature of the inner coil pipe. According to the defrosting control method for the fixed-frequency air conditioner, the temperature change trend of the inner coil pipe is innovatively utilized and combined with the external environmenttemperature for characterizing the frosting degree of an outer unit, and then the time of the air conditioner for entering the defrosting mode is judged, so that the situation that the fixed-frequencyair conditioner frequently enters the defrosting mode is avoided, the defrosting effect is guaranteed, and the user experience is improved.

Description

Technical field [0001] The invention belongs to the technical field of air conditioners, and specifically relates to a defrosting control method for fixed frequency air conditioners. 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. Thermal effect reduces the comfort of indoor environment and affects user experience. Therefore, whe...

AI Technical Summary

Problems solved by technology

[0003] For fixed-frequency air conditioners, the power supply frequency cannot be changed. Even if the indoor temperature reaches the set temperature, the air conditioner will not automatically adjust the cooling or heating speed.

Since the temperature of the outer coil of the fixed-frequency air conditioner does not have a temperature sensor, the temperature of the outer coil cannot be obtained, so the defrosting timing of the fixed-frequency air conditioner cannot be judged by parameters such as the temperature of the outer coil

Moreover, the existing defrosting process lacks auxiliary means to speed up the defrosting efficiency, resulting in a single defrosting process and low efficiency

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