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A control method for an electronic expansion valve of a transcritical carbon dioxide heat pump system

An electronic expansion valve, carbon dioxide technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems affecting system safety, hidden liquid return, etc., to avoid system oscillation, low operating cost, simple and convenient calculation process Effect

Active Publication Date: 2020-06-19
XI AN JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the discharge temperature control method is easy to bring back the hidden danger of liquid in order to ensure the discharge temperature of the compressor, which affects the safety of the system operation.

Method used

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  • A control method for an electronic expansion valve of a transcritical carbon dioxide heat pump system
  • A control method for an electronic expansion valve of a transcritical carbon dioxide heat pump system
  • A control method for an electronic expansion valve of a transcritical carbon dioxide heat pump system

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Embodiment Construction

[0043] see figure 1 As shown, a method for controlling the electronic expansion valve of a transcritical carbon dioxide heat pump system according to the present invention adjusts the exhaust pressure of the system by adjusting the opening of the electronic expansion valve in the transcritical carbon dioxide heat pump system, thereby stabilizing the outlet water temperature of the system to reach a predetermined target value, realizing Optimal operation of a transcritical carbon dioxide heat pump system.

[0044] The transcritical carbon dioxide heat pump system includes a compressor 1, a gas cooler 2, an electronic expansion valve 3, an evaporator 4, and a gas-liquid separator 5 are sequentially connected between the outlet and the inlet of the compressor 1; the evaporator 4 is provided with a fan 6; The outlet of the device 4 is connected to the inlet of the gas-liquid separator 5, and the gas outlet of the gas-liquid separator 5 is connected to the inlet of the compressor 1...

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Abstract

The invention discloses a method for controlling an electronic expansion valve of a transcritical carbon dioxide heat pump system, comprising the following steps: step 1, collecting exhaust pressure values; step 2, determining waterway control parameters; Gas pressure; Step 4, adjust the exhaust pressure; Step 5, calculate the COP in the steady state of the system; Step 6, verify the optimal exhaust pressure through the particle swarm optimization algorithm (PSO). The invention adopts the method of adjusting the opening of the electronic expansion valve and the change of the exhaust temperature to realize the method of controlling the exhaust pressure. The sampling speed is fast, the precision is high, the time lag is small, and it has strong robustness. It also overcomes the traditional In the discharge temperature control method, there is a defect in the hidden danger of liquid return caused by avoiding the excessive discharge temperature of the compressor. The invention performs pressure control on a refrigeration system with strong nonlinear characteristics, such as a transcritical carbon dioxide heat pump system, so that the transcritical carbon dioxide heat pump system has faster adjustment and control capabilities when operating under different working conditions.

Description

technical field [0001] The invention belongs to the technical field of heating, ventilation, refrigeration and heat pumps, and relates to a method for controlling an electronic expansion valve of a transcritical carbon dioxide heat pump system. Background technique [0002] In recent years, with the continuous destruction of the greenhouse effect and the ozone layer, research institutions and their government departments have begun to pay more attention to refrigerants that do not damage the ozone layer. Natural refrigerants have also received more and more attention. CO 2 The refrigerant is an environmentally friendly refrigerant, with an ozone layer-destroying potential value ODP=0, which does not destroy the ozone layer, and does not need to be recycled and regenerated. Its global warming potential index GWP=1 is an ideal natural refrigerant. As early as the 1880s, CO 2 It has been introduced into the field of refrigeration and air conditioning, and has been used for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B41/06F25B49/02F25B41/34
CPCF25B49/02F25B2700/1931F25B2600/2513F25B41/31Y02B30/70
Inventor 曹锋王驿凯叶祖樑王琳玉
Owner XI AN JIAOTONG UNIV
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