Defrost control method for fixed frequency air conditioner

Abstract

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. In order to improve the defrosting efficiency of the fixed-frequency air conditioner, the defrosting control method for the fixed-frequency air conditioner proposed by the present invention includes the following steps: when the fixed-frequency air conditioner is in the heating condition, detect the external environment temperature T, and Detecting the temperature of the inner coil at preset intervals; in the case of the first set temperature -T>preset value, judging whether to make the fixed-frequency air conditioner enter the defrosting mode according to the decay speed of the inner coil temperature. This application innovatively uses the temperature change trend of the inner coil and combined with the external environment temperature to characterize the frosting degree of the external unit, and thus judges the timing when the air conditioner enters the defrosting mode, avoids frequent defrosting of the fixed-frequency air conditioner, and ensures the defrosting effect. Improve 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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