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Supercritical pressure regulation of vapor compression system

A vapor compression, supercritical technology, used in compressors, gas cycle refrigerators, refrigerators, etc.

Inactive Publication Date: 2008-01-23
CARRIER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the downside, the vast majority of these fluids are problematic to use

Method used

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  • Supercritical pressure regulation of vapor compression system
  • Supercritical pressure regulation of vapor compression system

Examples

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Embodiment Construction

[0014] Figure 1 shows a prior art vapor compression system 20a comprising a compressor 22, a heat sinking heat exchanger (gas cooler as a subcritical cycle) 24, an expansion device 26, and a heat absorbing heat exchanger (evaporating device) 28.

[0015] Refrigerant circulates through the closed loop circulation system 20a. Preferably, carbon dioxide is used as refrigerant. Although described with reference to carbon dioxide, other refrigerants may also be used. Because carbon dioxide has a lower critical point, systems using carbon dioxide as a refrigerant typically require the vapor compression system 20a to operate in a supercritical manner. When the system 20a is operating in an overcritical manner, it is advantageous to control the high pressure component of the system 20a in order to control and optimize the performance and / or efficiency of the system 20a.

[0016] The refrigerant leaves compressor 22 at high pressure and high enthalpy, as indicated at point A in FIG....

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PUM

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Abstract

Refrigerant is circulated through a vapor compression system including a compressor, a gas cooler, an expansion device, and an evaporator. Preferably, carbon dioxide is used as the refrigerant. The expansion device is a work recovery device which extracts energy from the expansion process and is coupled with a fluid pumping device that cools the refrigerant flowing through the gas cooler. The fluid pumping device pumps fluid through the gas cooler at a flow rate related to the energy extracted from the expansion process. The system provides a self-controlling mechanism to regulate the pressure in the gas cooler. If the pressure in the gas cooler increases, more energy is extracted from the expansion process, increasing the flowrate of the fluid pumping device, and decreasing the pressure of the refrigerant in the gas cooler. If the pressure in the gas cooler decreases, less energy is extracted from the expansion process, decreasing the flowrate of the fluid pumping device, and increasing the pressure of the refrigerant in the gas cooler.

Description

technical field [0001] The present invention generally relates to a system for regulating the high pressure component of a transcritical vapor compression system by using an expander connected to a fluid pumping device, such as a fan or a pump. Background technique [0002] Chlorine-containing refrigerants are gradually being phased out due to their potential to destroy ozone. Hydrocarbons (HFCs) have been used as alternative refrigerants, but these refrigerants still have the potential to increase global warming. The use of "natural" refrigerants such as carbon dioxide and propane has also been proposed as an alternative fluid. Unfortunately, the vast majority of these fluids are problematic to use. Carbon dioxide has a low critical point, which allows air conditioning systems using carbon dioxide to actually operate above the critical point, or in most cases supercritical. The pressure of a subcritical fluid is a function of temperature at saturation (when both liquid a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B9/00F25B49/02F25B9/06
CPCF25B9/06F25B2600/17F25B2400/141F25B49/027F25B9/008F25B2309/061
Inventor T·H·西内尔J·M·格里芬
Owner CARRIER CORP