Abstract: For room air conditioners, the cooling capacity/heat output and performance coefficient are the core indicators, which directly affect the user’s comfort and electricity bill. Although the existing variable-frequency room air conditioners can automatically adjust the compressor frequency and the opening degree of the electronic expansion valve according to the fluctuations of indoor and outdoor conditions to improve their rationality compared to the fixed-frequency machines, due to the inability to change the refrigerant charge, the air conditioners operate inefficiently in most working conditions due to the mismatch of the charge. To solve this problem, a liquid storage module is added to the refrigeration system to achieve real-time adjustment of the charge by dynamically storing or releasing the refrigerant, thereby adding an adjustment dimension to the refrigeration system and forming a three-dimensional coordinated control mechanism with the compressor frequency and the opening degree of the electronic expansion valve. Under the precise control of the AI intelligent electronic control system, the three elements work together to optimize the operating state of the system and ultimately achieve the goal of improving the operating efficiency of the air conditioner.

Key words: Air conditioner, Refrigerant, Charging quantity, Liquid storage tank, Adjustment, SEER, HSPF