Test analysis of electric power change characteristics of split air conditioners under low temperature heating conditions

By means of a measured method, analyses the electric power change characteristics of the split air conditioners under low temperature heating conditions. The results show that the electric power of the heating condition of the split air conditioner is significantly higher than that of the cooling condition and the change of electric power is more complicated than the cooling condition. The temperature setting point of the air conditioner has a great influence on the waveform of the electric power change, so it is impossible to identify the operating state of the air conditioner with one kind of the variation waveform. Even for fixed-frequency split air conditioners, the electric power is constantly changing during heating operation, which provides a criterion for the household air conditioning behavior investigation method of the household total electricity meter data identification method. The tests find that the electric heater for direct heating is still started for most of the split air conditioners with electric auxiliary heating function even when the heat amount of the heat pump operation can meet the requirements, which is not energy saving and needs to be improved.