A method for controlling the flow of refrigerant in an air-conditioning system

Abstract

The embodiment of the invention discloses a method for controlling refrigerant flow in an air conditioning system. The method includes: in cooling mode, adjusting the opening degree of the first expansion valve according to the initial opening degree of the first expansion valve and the attainment degree of the intermediate pressure of the compressor, and adjusting the opening degree of the second expansion valve according to the initial opening degree of the second expansion valve Adjust the opening degree of the second expansion valve according to the suction superheat degree; in the heating mode, adjust the second expansion valve according to the initial opening degree of the second expansion valve, the external environment temperature and the attainment degree of the intermediate pressure of the compressor the opening degree of the valve, and adjust the opening degree of the first expansion valve according to the initial opening degree of the first expansion valve and the suction superheat degree. Through the technical solutions provided by the embodiments of the present invention, the precise control of the refrigerant flow rate is realized, so that the air conditioning system still has high performance under the two working conditions of high-temperature cooling and low-temperature heating, and reduces performance attenuation caused by ambient temperature changes.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of air conditioning, and in particular, to a method for controlling refrigerant flow in an air conditioning system. Background technique [0002] The gas-injection enthalpy-increasing compressor adopts two-stage throttling intermediate air-injection technology, and uses a flash evaporator for gas-liquid separation to achieve the effect of increasing enthalpy. It mixes and cools air while compressing at medium and low pressure, and then compresses normally at high pressure to increase the displacement of the compressor to achieve the purpose of increasing the heating or cooling capacity. [0003] In some harsh environments, for example, when the ambient temperature is in the range of -40 to 55°C, the compression ratio of the compressor will increase significantly compared with normal working conditions, which will lead to a decrease in the volumetric efficiency of the compressor. Greatl...

AI Technical Summary

Problems solved by technology

The opening of the electronic expansion valve will affect the flow rate of the refrigerant entering the air-jet enthalpy-enhancing compressor, thereby affecting the cooling or heating performance of the air conditioning system

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