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 firstly, the indoor temperature Tindoor is detected in real time under the condition that the fixed-frequency air conditioner is in the heating working condition, and the temperature of an inner coil pipe is detected every preset time; secondly, the difference delta T between the preset temperature Tset and the Tindoor is equal to Tset minus Tindoor is calculated; and thirdly, whether the fixed frequency air conditioner enters a defrosting modeor not is judged according to the difference delta T and the attenuation speed of the temperature of the inner coil pipe. According to the defrosting control method, the change trend of the temperature of the inner coil pipe is innovatively utilized, and the frosting degree of an outer unit is characterized in combination with the change of the indoor temperature, so that the timing of entering the defrosting mode of the air conditioner is judged, the defrosting effect of the fixed frequency air conditioner 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 in particular relates to a defrosting control method for a fixed-frequency air conditioner. Background technique [0002] As a device that can adjust the indoor ambient temperature, the air conditioner works on the principle that the indoor ambient temperature is reduced or increased by the refrigerant passing through the circulation pipeline through high-pressure / low-pressure / gas / liquid state transitions, that is, from From the perspective of the indoor unit, the air conditioner is in cooling or heating mode. When the air conditioner is in heating operation, if the temperature of the outdoor coil is too low under certain humidity conditions, it will cause frosting, and the frosting of the outdoor coil will reduce the heat exchange efficiency of the outdoor heat exchanger and affect the cooling performance of the air conditioner. The thermal effect reduces the comfort of the indoor ...

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

Images