Air conditioning control method and device in heating mode

Abstract

The invention provides a heating-mode air conditioner control method and device. The method comprises the steps that when an air conditioner is in a heating mode, whether the temperature of an outer tube of the air conditioner drops to an early warning temperature or not is detected; and if the temperature of the outer tube of the air conditioner drops to the early warning temperature, the opening degree of an electronic expansion valve connected with an evaporator in the air conditioner is adjusted. The heating-mode air conditioner control method and device solve the technical problem that in the prior art, an air conditioner cannot conduct long-time continuous heating operation under a low-temperature condition, thereby achieving the technical effect that the continuous heating operation time of the air conditioner under the low-temperature condition is prolonged effectively.

Description

technical field [0001] The present invention relates to the technical field of air conditioning control, in particular to an air conditioning control method and device in a heating mode. Background technique [0002] When the air conditioner uses the heat pump cycle heating, the gas Freon will be pressurized by the compressor to become a high-temperature and high-pressure gas, and then enter the heat exchanger of the indoor unit (in this case, the condenser) through the switching of the four-way valve, and condense and liquefy to release heat. It will become a liquid, and at the same time, the indoor air will be heated, so as to achieve the ultimate goal of increasing the indoor temperature. Then, the liquid Freon is decompressed by the throttling device, enters the heat exchanger of the outdoor unit (at this time, the evaporator), evaporates and gasifies, absorbs heat, and becomes a gas, and at the same time absorbs the heat of the outdoor air, and then enters the compresse...

AI Technical Summary

Problems solved by technology

[0003] That is, when the air conditioner is heating in winter, the four-way valve is powered on, the indoor coil becomes a condenser, and the outdoor coil becomes an evaporator. Generally, the outdoor temperature in winter will be lower than freezing point. The central coil is easy to frost or even freeze, and the frequency of defrosting the air conditioner has a lot to do with the outdoor ambient temperature. The lower the outdoor temperature is, the more frequent the defrosting operation will be.

[0004] Therefore, when the air conditioner is running under low temperature conditions, there will often be a problem of early defrosting due to the low temperature of the external unit tube, which will greatly affect the comfort of the air conditioner.

[0005] If it is possible to effectively prolong the continuous heating operation time of the air conditioner under low temperature conditions, and at the same time alleviate the problem of excessive frosting of the external unit, no effective solution has been proposed so far

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