IDENTIFICATION OF THE REFRIGERANT PRESSURE IN SPLIT-TYPE AIR CONDITIONERS BASED ON HARMONIC ANALYSES OF ELECTRICITY SUPPLY CURRENT

Abstract

An analysis is presented of the interdependence between power supply characteristics of single phase split-type air conditioners and pressure of the operating fluid (refrigerant) within the air conditioner system. On the basis of the tests performed by a real air conditioner the corresponding correlations have been established. Of special interest is the influence of refrigerant pressure on the level of the second harmonic of the supply current and active input power of air conditioner. The established correlations allow that by processing the input current and voltage of an air conditioner one can make a diagnosis of the state of refrigerant pressure within the system which is a fast, comfortable, and ecologically better approach compared to the classic direct measurement on the operating fluid by a pressure gauge.