Heat pump system for increasing air supplementation amount through heat recovery and control method thereof

Abstract

The invention discloses a heat pump system for increasing the air supplementation amount through heat recovery and a control method thereof. The heat pump system comprises a two-stage compressor, an indoor heat exchanger, an outdoor heat exchanger and a flash evaporator. The heat pump system is characterized in that the heat pump system further comprises a heat return air supplementation device; the heat return air supplementation device comprises a heat storage heat exchanger, a first branch circuit and a second branch circuit; the heat storage heat exchanger recycles heat of a two-stage compressor shell; the first branch circuit enables a second end opening of the indoor heat exchanger to be connected with an inlet of the heat storage heat exchanger through a first heat return solenoid valve; the second branch circuit enables a second end opening of the outdoor heat exchanger to be connected with an inlet of the heat storage heat exchanger through a second heat return solenoid valve;and an outlet of the heat storage heat exchanger communicates with the flash evaporator through a pipe. According to the heat pump system, the heat of the two-stage compressor shell is recycled for increasing the air supplementation amount, so that the problem that the air supplementation amount, required in the high-frequency running process, of a low-temperature variable frequency heat pump system is insufficient is solved; and meanwhile, the heating capacity and the refrigerating capacity are increased.

Description

technical field [0001] The invention relates to a heat pump system, in particular to a heat pump system which utilizes heat recovery to increase air supply and a control method thereof. Background technique [0002] The effect of ordinary air source heat pumps on heating in northern winter increases with the decrease of ambient temperature, while the heating capacity of heat pump air-conditioning systems is seriously attenuated, which cannot meet the heating requirements. In recent years, the low-temperature heat pump system adopts the technology of intermediate gas supplementation to increase enthalpy, which can reduce the attenuation of air-conditioning heating heat in low-temperature environments. In the same way, the air supply and enthalpy increase system is adopted, and its cooling capacity is also better than that of ordinary systems in high temperature environments. For low-temperature inverter heat pump systems, when operating at high frequency, there will be a pro...

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Problems solved by technology

[0003] The present invention proposes a heat pump system and its control method that utilizes heat recovery to increase the amount of air supply. The system and method solve the problem of insufficient air supply during high-frequency operation, and the heating capacity is greatly improved.

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