Heat pump air conditioner and control method thereof

Abstract

The invention provides a heat pump air conditioner and a control method thereof. The heat pump air conditioner comprises a refrigerant circulation loop and an indoor heat exchanger (27); the refrigerant circulation loop consists of a compressor (23), an intermediate condenser (24), an intermediate evaporator (26) and a throttling device (25); the indoor heat exchanger (27) capable of achieving refrigeration or heating in a room can exchange heat with the intermediate evaporator (26) or the intermediate condenser (24) through a water circulation loop in which water flows. The heat pump air conditioner can effectively prevent refrigerant leakage caused by the connection of a refrigerant pipeline into the room and effectively avoid harm caused to people in vehicles or indoors, and the use safety and reliability of the heat pump air conditioner are improved. As the water circulation loop is adopted for heat exchange with air, valve parts, including electromagnetic valves, reversing valvesand the like which are resistant to high pressure, high temperature and corrosion are effectively reduced, the development cost is greatly reduced, the fault probability is effectively decreased, andrunning is safer and more reliable.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a heat pump air conditioner and a control method thereof. Background technique [0002] At present, the existing electric vehicle air conditioners usually pass the refrigerant directly to the HVAC through the air conditioning pipeline, and the HVAC is connected to the interior of the car. If the refrigerant leaks from the evaporator in the HVAC, the refrigerant will be blown into the cabin through the air duct. interior, affecting the health of occupants in the vehicle. Carbon dioxide is the most ideal refrigerant for automobile air conditioners, and its operating pressure is above 10 MPa. If the evaporator of an automobile air conditioner using carbon dioxide leaks, its high pressure may directly cause harm to the occupants. [0003] At present, the electric vehicle air conditioner usually adopts the mode of single-cooled air-conditioning refrigeration + PT...

AI Technical Summary

Problems solved by technology

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the pipeline or heat exchanger in the electric vehicle HVAC in the prior art is prone to leakage of refrigerant and cause damage to the health of the occupants in the vehicle, thereby providing a Heat pump air conditioner and control method thereof

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