Defrosting control method used for fixed-frequency air conditioner

Abstract

The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control method used for a fixed-frequency air conditioner. In order to improve defrosting efficiency of the fixed-frequency air conditioner, the defrosting method used for the fixed-frequency air conditioner disclosed by the invention comprises the following steps: determining an outer environment temperature T in a case that the fixed-frequency air conditioner is in a heating working condition, and detecting an inner coiled tube temperature every preset time; and if the first set temperature (T) is higher than a preset value, judging whether the fixed-frequency air conditioner enters the defrosting mode or not according to a decay rate of the inner coiled tube temperature. The defrosting control method creatively utilizes the inner coiled tube temperature change trend and combines the outer environment temperature to represent outdoor unit frosting degree, judges an opportunity that the air conditioner enters the defrosting mode, prevents the fixed-frequency air conditioner from frequently entering defrosting, guarantees the defrosting effect, and improves user experience.

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

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