A heat pump system and its control method using heat recovery to increase the amount of supplementary air

Abstract

The invention discloses a heat pump system which utilizes heat recovery to increase the amount of supplementary air and a control method thereof. The heat pump system includes a two-stage compressor, an indoor heat exchanger, an outdoor heat exchanger and a flash evaporator, and is characterized in that it also includes a heat recovery and air supply device, which includes: recovery of the two-stage compressor The heat storage heat exchanger of the shell is connected to the second port of the indoor heat exchanger and the first branch of the inlet of the heat storage heat exchanger through the first heat recovery solenoid valve, and connected to the outdoor heat exchange through the second heat recovery solenoid valve The second port of the heat storage device and the second branch of the inlet of the heat storage heat exchanger, and the outlet of the heat storage heat exchanger communicates with the flash evaporator through a pipeline. The invention recovers the heat of the compressor shell to increase the air supply volume, solves the problem of insufficient air supply volume when the low-temperature frequency conversion heat pump system operates at high frequency, and simultaneously improves the heating capacity and cooling capacity.

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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