Air-conditioning system adopting two-stage enthalpy increase by gas replenishment and control method of system

Abstract

The invention provides an air-conditioning system, and particularly relates to a heat pump air-conditioning system which comprises a swirl compressor, a condenser, an evaporator, an economizer, a throttling device and pipeline control valves, wherein a refrigerant after evaporating in the economizer is used as the gas replenishment for the compressor of the system; the air-conditioning system comprises a first gas replenishment branch and a second gas replenishment branch; the first gas replenishment branch is connected with a gas replenishment opening at the low pressure cylinder of the swirl compressor; the second gas replenishment branch is connected with a gas replenishment opening at a higher pressure part of the swirl compressor; the air-conditioning system further comprises a control system used for controlling the opening and closing of the control valves in the gas replenishment branches. The air-conditioning system and the control method of the system can meet the two requirements, that is, the requirement that the heat making performance is improved by adopting enthalpy increase by gas replenishment under normal and low temperature conditions and that the exhaust gas temperature of the compressor can be reduced by liquid carrying gas replenishment under an ultra-low temperature condition, the heat making requirement under a lower temperature environment can also be met, and the application working condition range of the air-conditioning system adopting the swirl compressor can be expanded. The invention further relates to the control method of the air-conditioning system.

Description

technical field [0001] The invention belongs to the technical field of refrigeration, and in particular relates to a two-stage air supply and enthalpy increase system and a control method thereof. Background technique [0002] At present, the heat pump unit adopting two-stage enthalpy increasing technology can meet the demand of increasing heating capacity and COP under low temperature conditions, but under ultra-low temperature conditions, it will cause the discharge temperature of the compressor to rise, and it is easy to exceed the allowable discharge temperature of the compressor. If the air temperature is too high, the lubricating oil will fail and the compressor will burn out if it is serious. Therefore, in the case of ultra-low temperature heating, it is more important to reduce the discharge temperature of the compressor and improve the reliability of the system than to increase the heating capacity and COP. [0003] In addition, the air supply position of the air s...

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Problems solved by technology

[0003] In addition, the air supply position of the air supply and enthalpy increase port of the general compressor is designed according to certain working conditions. Once the position is determined, its function is relatively determined, which leads to the current two-stage air supply and enthalpy increase compressor. Under the conditions of improving the heating capacity and COP, the system cannot meet the requirements of ultra-low temperature heating reliability

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