Abstract: When the air conditioner operates in the conventional dehumidification mode, dehumidification will cause human discomfort with the decrease of temperature. Therefore, it is of great significance to study the air conditioner which can realize the function of constant temperature and dehumidification to improve the living environment. The basic scheme of this study is: at the same time of dehumidification and refrigeration, turn on the electric heating element of the indoor unit, and then adjust the compressor frequency to cold and heat of the room and achieve constant temperature dehumidification. The test results show that this function can not only effectively dehumidify, but also control the room temperature fluctuation within ±1℃, so as to improve the comfort of users using the dehumidification function of air conditioning.

Key words: Electric heating, Frequency regulation, Constant temperature dehumidification, Comfort