Air conditioning expansion valve control method and control device based on superheat degree

Abstract

The invention discloses an air-conditioner expansion valve control method and device based on the superheat degree. The method includes the steps that air-conditioner refrigeration running is carried out, and the current indoor environment temperature, the current compressor exhaust gas temperature, the current air return superheat degree deviation and the current air return superheat degree deviation variable quantity are obtained; if the current air return superheat degree deviation and the current air return superheat degree deviation variable quantity meet the superheat degree conditions and the temperature conditions are met at the same time, the following valve regulating processes are executed; and the current air return superheat degree deviation is increased to be larger than zero to serve as an actual air return superheat degree deviation, the current air return superheat degree deviation variable quantity is increased to be larger than zero to serve as an actual air return superheat degree deviation variable quantity, and the opening degree of an expansion valve is adjusted according to the actual air return superheat degree deviation and the actual air return superheat degree deviation variable quantity. By means of the air-conditioner expansion valve control method and device, the adaptivity of the expansion valve adjustment along with temperature changes is achieved, the running performance of the system and the comfort of temperature adjustment during superheat degree valve regulation are improved.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, in particular relates to the control of an air conditioner expansion valve, and more specifically relates to an air conditioner expansion valve control method and control device based on superheat. Background technique [0002] The operating frequency of the compressor of the inverter air conditioning system can be automatically adjusted according to the change of room temperature and set temperature, so as to achieve the effect of minimum temperature fluctuation, best comfort and best energy saving. When the operating frequency of the compressor is adjusted, the refrigerant flow rate of the circulation loop of the air conditioning system also changes. At this time, it is necessary to adjust the opening of the expansion valve synchronously to achieve the best energy efficiency control. [0003] At present, the frequency conversion air-conditioning system mainly adopts the method of super...

AI Technical Summary

Problems solved by technology

Especially in high-temperature and high-humidity environments, the indoor evaporation pressure is high, and the evaporation temperature is too high, which will affect the calculated value of the degree of superheat, and then affect the performance of the air conditioning system that relies on the degree of superheat to adjust the opening of the expansion valve.

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