Air-conditioner refrigerant flow control method

Abstract

The invention discloses an air-conditioner refrigerant flow control method. The air-conditioner uses an electronic expansion valve as a throttling component. The air-conditioner refrigerant flow control method includes the steps of S1, determining a condensate depression delta T according to running modes of the air-conditioner, S2, determining a target condensate depression delta P according to running modes of the air-conditioner and environmental temperature, and S3, obtaining a condensate depression differential value SH according to the difference between the condensate depression delta T and the target condensate depression delta P, and regulating the openness of the electronic expansion valve according to the condensate depression differential value SH. The air-conditioner refrigerant flow control method has the advantages of accurate flow controlling and low cost.

Description

technical field [0001] The invention relates to the technical field of air conditioning, and more specifically, to a method for controlling the flow of refrigerant in an air conditioner. Background technique [0002] With the development of air-conditioning technology, DC inverter air conditioners are becoming more and more mature in technology, and have been recognized by users in the market, and have gradually entered thousands of households. According to relevant information on the air-conditioning refrigeration market, in recent years, the market share of my country's inverter air conditioners has risen rapidly, and now it has exceeded 50%. Inverter air conditioners have become the development trend of air conditioners in the future. The advantage of the inverter air conditioner is that it can adjust the output of the inverter compressor according to the system load, so it is more efficient and energy-saving. However, the output change of the compressor requires that t...

AI Technical Summary

Problems solved by technology

[0003] (1) The system is in a high-load state at the initial stage of starting up, and the superheat of the air-conditioning system has not yet formed in a short period of time. At this time, the detected superheat value cannot represent the real overheat state. Infinite loop

[0004] (2) At present, the negative temperature coefficient thermistor sensor is commonly used in air conditioners. It has the advantages of small size, high sensitivity, fast response speed, and high resolution, but its low linearity and poor stability make the temperature test have certain errors, and the superheat The control range is narrow, so the error of the sensor has a great influence on the superheat control, and the operating state of the system deviates greatly from the optimal state

[0005] (3) The superheat control is highly dependent on the detection accuracy of the sensor. The difference in the installation position of the sensor, or the error in the installation of the sensor due to later maintenance and the refrigerant leakage of the air conditioner will cause the system to lose precise control

Images