Experimental research on commercial digital VRF multi-connected units with sub-cooled ice storage system

According to the high sub-cooled refrigeration cycle theory, develops a commercial digital multiple variable refrigerant flow rate air conditioning system and carries experimental research on a model machine which proves to be operating under the following six modes: ice charging, ice discharging, normal refrigerating, heat charging, heat discharging and heat pump operation. The period of the ice charging operation is about 8 hours, 378 MJ of cool storage capacity is achieved and the ice thickness of out surface of the copper tube is 35 mm; the cool capacity increases by about 30 percent, the endurance of ice discharging is about 8 hours;and the novel system can operate in the heat charging mode and heat discharging mode, the latter mode allows alleviating the frost formation because of the rise of the evaporating temperature.