Trans-critical CO2 heat pump unit and control method thereof

A heat pump unit, transcritical technology, applied in the direction of refrigerators, compressors, refrigeration components, etc., can solve the problem of low water outlet temperature of heat pumps, and achieve good working conditions

Inactive Publication Date: 2019-02-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Existing general CO 2 The outlet water temperature of the heat pump is low, which is difficult to meet the needs. It is necessary to design a new heat pump system to achieve a higher outlet water temperature.

Method used

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  • Trans-critical CO2 heat pump unit and control method thereof
  • Trans-critical CO2 heat pump unit and control method thereof

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Experimental program
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Effect test

Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] see figure 1 , a transcritical CO 2 The heat pump unit includes the first compressor 1, the second compressor 2, the gas cooler 3, the primary regenerator 4, the economizer 5, the first electronic expansion valve 6, the evaporator 7, the gas-liquid separator 8, the second Stage regenerator 9, first electric three-way valve 10, second electric three-way valve 11, second electronic expansion valve 12, water pump 13.

[0027]The second electric three-way valve 11 includes three ports of t port 14, u port 15 and v port 16; the first electric three-way valve 10 includes three ports of q port 17, r port 18 and s port 19; The economizer 4 includes four ports of e port 20, f port 21, g port 22 and h port 23; the economizer 5 includes four ports of i port 24, j port 25, k port 26 and l port 27; the secondary regenerator 9 includes four ports of m port 28 , n...

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Abstract

The invention discloses a trans-critical CO2 heat pump unit and a control method thereof. The trans-critical CO2 heat pump unit comprises a first compressor, a second compressor, a gas cooler, a primary regenerator, an economizer, a first electronic expansion valve, an evaporator, a gas-liquid separator, a secondary regenerator, a first electric three-way valve, a second electric three-way valve,a second electronic expansion valve and a water pump. According to the trans-critical CO2 heat pump unit disclosed by the invention, the first electric three-way valve and the second electric three-way valve are controlled to control the primary regenerator and the secondary regenerator to be switched on and off so as to guarantee a good working condition of each compressor; a system can stably and efficiently run by controlling the first electronic expansion valve and the second electronic expansion valve; and by controlling the frequency of each compressor, outlet water temperature of the system can reach 70 DEG C.

Description

technical field [0001] The invention belongs to the technical field of heat pumps, in particular to a transcritical CO 2 Heat pump unit. Background technique [0002] The heat pump can absorb the heat in the ambient air, transfer the heat to the circulating water through the circulation of the working medium, and play the role of heating. Traditional heat pumps mostly use traditional working fluids such as R134a and R410a, which are poor in environmental protection and are facing a trend of being phased out. [0003] G Lorentzen, former president of the International Institute of Refrigeration, proposed the CO 2 The transcritical cycle theory points out that it will have extremely broad development prospects in the field of heat pumps. CO 2 The critical temperature is very low at 31.1°C, so CO 2 Heat pump systems generally use a transcritical cycle. CO 2 The exhaust temperature of the transcritical cycle compressor is relatively high (up to 100°C or more), and in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B9/00F25B41/06F25B49/02F25B41/34
CPCF25B9/008F25B49/022F25B2600/2513F25B2400/077F25B2309/061F25B41/31Y02B30/70
Inventor 曹锋崔靖殷翔殷叔靖
Owner XI AN JIAOTONG UNIV
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