Abstract: The traditional multi-split air conditioning system performs simultaneous temperature and humidity treatment on indoor air, reducing room temperature while dealing with a large amount of moisture load, resulting in poor comfort and high energy consumption. In order to balance fast comfort and energy-saving effects, a high sensible heat refrigeration control algorithm for multi-split air conditioning systems was designed. Through experiments, the performance of the unit and indoor environmental temperature under ordinary refrigeration mode and high sensible heat refrigeration mode were studied. The results showed that, under the condition of ensuring the refrigeration capacity of the unit, the high sensible heat refrigeration control has higher refrigeration energy efficiency than the ordinary refrigeration operation control, and can effectively increase the temperature of the cold air blown out, improving energy efficiency while enhancing user comfort.

Key words: High sensible heat cooling, Multi-split air conditioner, Evaporating temperature