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Method of determining optimal coefficient of performance in a transcritical vapor compression system

A vapor compression, transcritical technology, applied in compressors, compressors with reversible cycles, gas cycle refrigerators, etc.

Inactive Publication Date: 2008-04-09
CARRIER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Refrigerant leaves the gas cooler at gas cooler outlet temperature

Method used

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  • Method of determining optimal coefficient of performance in a transcritical vapor compression system
  • Method of determining optimal coefficient of performance in a transcritical vapor compression system

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Embodiment Construction

[0015] FIG. 1 shows a schematic diagram of a vapor compression system 20 . Vapor compression system 20 includes compressor 22 , gas cooler 24 , expansion device 26 , and evaporator 28 . Refrigerant circulates through the closed loop vapor compression system 20 . The refrigerant leaves compressor 22 at high pressure and high enthalpy and flows through gas cooler 24 dissipating heat in order to exit the gas cooler 24 at low enthalpy and high pressure. A fluid medium receiving heat from the refrigerant flows through the gas cooler 24 . The refrigerant then passes through expansion device 26 and expands to a lower pressure. After expansion, the refrigerant flows through the evaporator 28 and releases heat to the fluid medium. The refrigerant leaves evaporator 28 with high enthalpy and low pressure. Refrigerant then enters the compressor to complete the cycle.

[0016] Preferably, carbon dioxide is used as refrigerant. Although described with reference to carbon dioxide, othe...

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Abstract

The high side pressure of a vapor compression system is selected to optimize the coefficient of performance by measuring the gas cooler exit temperature with a temperature sensor. For any gas cooler exit temperature, a single optimal high side pressure optimizes the coefficient of performance. The optimal high side pressure for each gas cooler exit temperature is preset into a control and is based on data obtained by previous testing. A temperature sensor measures the gas cooler exit temperature. The control determines the optimal high side pressure based solely on the gas cooler exit temperature and the data preset into the control.

Description

technical field [0001] The present invention generally relates to a method of optimizing the coefficient of performance of a transcritical vapor compression system by detecting the gas cooler outlet temperature and determining the optimum high side pressure of the vapor compression system based solely on the gas cooler outlet temperature for optimizing coefficient of performance. Background technique [0002] Carbon dioxide is an environmentally friendly refrigerant commonly used in transcritical vapor compression systems. Carbon dioxide has a lower critical point, and the vast majority of vapor compression systems employing carbon dioxide as a refrigerant operate either transcritically or partially above the critical point. The pressure of a subcritical fluid is a function of temperature at saturation (when both liquid and vapor are present). However, when the temperature of the fluid is above the critical temperature (supercritical), the pressure is a function of the den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B13/00
CPCF25B2600/17F25B2600/2513F25B2309/061F25B2700/2102F25B9/008
Inventor Y·K·朴
Owner CARRIER CORP