HEAT RECOVERY VANTILATION WITH DUAL CIRCUIT HEAT PUMP

摘要

A heat recovery ventilation system with a dual circuit heat pump is provided to carry out cooling, heating and dehumidifying operation by low power consumption without any decrease in the operation efficiency and ventilate room air without any loss of cold or heat of the room air. In a heat recovery ventilation system with a dual circuit heat pump, refrigerant circulates a first refrigerant circulation circuit from a compressor(CO) to the third heat exchanger(HE3) of a second intake path via a first heat exchanger(HE1) of a second exhaust path(33), a first check valve(C1) for bypass, and an expansion valve(E3) for a third heat exchanger in sequence and simultaneously a second refrigerant circulation circuit from the compressor to the third heat exchanger(HE4) of the second intake path via a second heat exchanger(HE2) of the second exhaust path, a second check valve(C2) for bypass, and an expansion valve(E4) for a fourth heat exchanger in sequence, in a cooling mode. In a heating mode, the refrigerant circulates the first refrigerant circulation circuit from the compressor to the first heat exchanger of the second exhaust path via the third heat exchanger of the second intake path, a third check valve(C3) for bypass, and an expansion valve(E1) for the first heat exchanger in sequence and simultaneously the second refrigerant circulation circuit from the compressor to the second heat exchanger of the second exhaust path via the fourth heat exchanger of the second intake path, the fourth check valve for bypass and an expansion valve(E2) for the second heat exchanger in sequence. In a dehumidification mode, the refrigerant circulates the first refrigerant circulation circuit from the compressor to the third heat exchanger of the second intake path via the first heat exchanger of the second exhaust path, the first check valve for bypass, and the expansion valve for the third heat exchanger in sequence and simultaneously the second refrigerant circulation circuit from the compressor to the second heat exchanger of the second exhaust path via the fourth heat exchanger of the second intake path, a fourth check valve(C4) for bypass and the expansion valve for the second heat exchanger in sequence.