Control method for improving stability of heating process of air conditioner

Abstract

The invention discloses a control method for improving the stability of a heating process of an air conditioner, and relates to an air conditioner performance control method. The control method comprises the steps that when the air conditioner runs in a heating mode, the outdoor environmental temperature, the outdoor environmental humidity and the temperature of a coiler of a heat exchanger of anoutdoor unit are obtained; by comparing the temperature of the coiler of the heat exchanger of the outdoor unit with a temperature interval preset value, a capillary network control valve is controlled to be started; after a pipe network branch is started, the maximum opening time of a pipe network is determined according to the obtained outdoor environmental humidity; according to the temperatureof the coiler of the heat exchanger of the outdoor unit, a defrosting exit temperature preset value and the maximum opening time of the pipe network, the air conditioner is controlled to exit from the defrosting mode. The problems are solved that in an existing defrosting process, heating output is interrupted, and the whole heating capacity is reduced; when the heat exchanger of the outdoor unitis defrosted, a refrigerant circulating system can be little affected, the heating capacity in the process is ensured so as to maintain indoor temperature smooth, and no additional energy consumptionis increased.

Description

technical field [0001] The invention relates to an air conditioner performance control method, in particular to a control method for improving the stability of the air conditioner heating process. Background technique [0002] When the existing inverter air conditioner system is running at low temperature for heating, the compressor runs at a high frequency, and the heat exchanger of the outdoor unit will continue to frost. At present, the countermeasure adopted by most inverter air conditioners is to perform defrosting operation at regular intervals, switch between indoor unit and outdoor unit for cooling and heating through the four-way reversing valve, and switch back to the previous one after the outdoor heat exchanger defrosts. run mode. This measure effectively solves the problem of frosting on the heating outdoor heat exchanger, but the defrosting process will lead to a decrease in the heating performance of the air conditioner and a large fluctuation in the indoor t...

AI Technical Summary

Problems solved by technology

In order to achieve the temperature rise of the hairpin tube to defrost the fins, the amount of high-temperature refrigerant required to be mixed must be large, and the amount of refrigerant flowing through the indoor heat exchanger will be significantly reduced, resulting in a significant decline in the capacity of the indoor and outdoor heat exchangers, and the indoor temperature There will still be significant temperature fluctuations

[0004] Another prior art uses dual outdoor heat exchangers. When one heat exchanger absorbs heat and the other heat exchanger releases heat to defrost, a large amount of refrigerant is also required to be split, so that the flow of refrigerant through the indoor heat exchanger fluctuates more. large, and for one defrosting and one heat absorption, especially when the two outdoor heat exchangers have different areas, or when the two outdoor heat The fluctuating effect of the capacity of the heat exchanger, causing room temperature fluctuations

Moreover, the frequency of alternate defrosting of two outdoor heat exchangers is higher than that of a single outdoor heat exchanger, which aggravates the frequency of indoor temperature fluctuations

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