Heat pump air-conditioning system and control method

Abstract

The invention provides a heat pump air-conditioning system and a control method. The heat pump air-conditioning system comprises a compressor (1), an inner unit heat exchanger (2), an outer unit heatexchanger (3), a throttling gear (4), a refrigerant circulation loop for connecting the compressor (1), the inner unit heat exchanger (2), the outer unit heat exchanger (3) and the throttling gear (4)in series and a heat storage module (5) arranged in the refrigerant circulation loop, the heat storage module (5) is used for heating heat from a refrigerant in the refrigerant circulation loop and storing the heat when needed, and the refrigerant in the refrigerant circulation loop is heated by the heat storage module (5) when defrosting of the outer unit heat exchanger is needed. By means of the heat pump air-conditioning system and the control method, when the indoor heat load is low, redundant heat of the system can be stored to be used for defrosting, the heat is released through the heat storage module for defrosting in the defrosting process, indoor heating can be continuously carried out, the room temperature can be kept unchanged, and the room comfort is improved.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to a heat pump air conditioning system and a control method. Background technique [0002] The defrosting methods of the existing heat pump air conditioner are mainly two methods of refrigeration cycle defrosting and hot gas defrosting. Among them, the defrosting of the refrigeration cycle is to switch the system from the heating cycle to the defrosting of the refrigeration cycle through the four-way reversing valve, and the hot gas defrosting is to increase the flow rate of the expansion valve under the heating cycle so that the high-temperature refrigerant enters the condenser for defrosting. Neither method can heat the room during the defrosting process, which will cause the temperature of the room to drop and affect the comfort of the room. Especially in the refrigeration cycle defrosting method, the indoor heat exchanger acts as an evaporator during defros...

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the heat pump air conditioner in the prior art cannot supply heat to the room during the defrosting process, causing the room temperature to drop and affecting the comfort of the room, thereby providing a heat pump air conditioner system and control method

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