The application of intelligent control technologies and internet technologies to room air conditioning systems is based on the performance monitoring of air-conditioning systems. In the study

the method of real-time monitoring of the performance of room air-conditioning system was proposed. First

temperature measuring points were arranged in the air conditioner

and the temperature and circuit data were transformed into refrigerant state parameters. Subsequently

the mass flow rate of refrigerant was calculated via a semi-empirical compressor model

and the heat exchange of the indoor unit was calculated via the enthalpy difference. Finally

the power was calculated by using circuit data. Thus

the mass flow rate

capacity

power

and energy efficiency were monitored. The test results indicate that the average deviation of the calculated performance obtained by the method in the study is less than 15%. The deviation is mainly attributed to the calculation of evaporating pressure that significantly influences the calculation of the mass flow rate.