Air conditioning system and control method

Abstract

The invention provides an air conditioning system and a control method. In the air conditioning system, the inlet of a compressor is connected with the first opening of a cooler through a second pipeline; one end of an indoor heat exchanger is connected with one end of a first throttling expansion valve through a third pipeline; the other end of the outdoor heat exchanger is connected with one endof a second throttling expansion valve; the second opening of a cooler is connected with the other end of the first throttling expansion valve through a fourth pipeline; the third opening of the cooler is connected with the other end of the second throttling expansion valve through a fifth pipeline; a gulp valve is arranged on the second pipeline in an openable and closable manner; a first temperature detector is used for detecting the temperature of fluid in the third pipeline; and a second temperature detector is used for detecting the temperature of fluid in the fourth pipeline or the fifth pipeline. In this way, the temperature can be detected through the first temperature detector and the second temperature detector, and the fluid temperature of key positions can be conveniently obtained; and then, the difference value of the detected temperature can be calculated, so that whether the gulp valve is abnormal or not can be judged through the difference value.

Description

technical field [0001] The present invention relates to the technical field of air conditioning, in particular to an air conditioning system and a control method. Background technique [0002] With the promotion and application of coal-to-electricity projects and the continuous growth of the heating demand market, ultra-low temperature air source heat pump heating products that use intermediate gas supplementation to increase enthalpy have become one of the main products in the air-conditioning market, and the system process is also more complicated. The air supply and enthalpy increase loop and the air supply enthalpy increase solenoid valve realize the switching control of the system process. In the actual operation of the unit, there are air supply enthalpy increasing mode (air supply valve open) and normal mode (air supply valve closed), and the compressor, throttling mechanism, oil return and defrosting control of the unit are completely different in the two modes. The...

AI Technical Summary

Problems solved by technology

[0004] However, the currently disclosed technologies focus more on the control optimization of the amount of supplementary air under the mode of supplying air to increase enthalpy (opening the supplementary air valve), in order to achieve system performance while avoiding excessive supply of supplementary air or backflow of supplementary air. Lack of research on system operation and detection and judgment under abnormal valve conditions

Images