Heat pump air conditioner and its defrosting method

Abstract

The invention discloses an air conditioner for a heat pump and a defrosting method of the air conditioner for the heat pump. The air conditioner for the heat pump comprises a compressor (1), an evaporator (2), an auxiliary connecting pipeline (3), a pumping device (4), a condenser (5) and a throttling device (6). The auxiliary connecting pipeline (3) is connected between an outlet of the evaporator (2) and an inlet of the condenser (5) and connected with the compressor (1) in parallel. A first switching valve (7) is arranged on the auxiliary connecting pipeline (3). The pumping device (4) is connected with the throttling device (6) in parallel. According to the air conditioner for the heat pump, the problem that in the prior art, the energy efficiency is poor during defrosting of an air conditioner for a heat pump can be solved.

Description

technical field

[0001] The invention relates to the technical field of air conditioners, and in particular, to a heat pump air conditioner and a defrosting method thereof. Background technique

[0002] When the heat pump is in normal operation, the low temperature side is the evaporator and the high temperature side is the condenser. The heat pump absorbs heat from the low temperature side and transfers the heat to the high temperature side, thereby providing the temperature of the high temperature side and meeting the high temperature demand of the high temperature side. When the heat pump is running in winter, the ambient temperature on the low-temperature side is very low most of the time, and the temperature of the refrigerant inside the evaporator is lower than zero. The heat exchange effect is reduced, resulting in a decrease in the heating capacity of the entire unit, which cannot meet the heating demand. At this time, it is necessary to defrost the evaporator. [0...

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