Method and apparatus for control of carbon dioxide gas cooler pressure by use of a capillary tube

  • US 7,721,569 B2
  • Filed: 08/31/2006
  • Issued: 05/25/2010
  • Est. Priority Date: 01/13/2004
  • Status: Expired due to Fees
First Claim
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1. A transcritical vapor compression system comprising:

  • a fluid circuit circulating a refrigerant in a closed loop, said fluid circuit having operably disposed therein, in serial order, a compressor, a first heat exchanger, a first capillary tube and a second heat exchanger wherein said compressor compresses the refrigerant from a low pressure to a supercritical pressure, said first heat exchanger is positioned in a high pressure side of said fluid circuit and said second heat exchanger is positioned in a low pressure side of said fluid circuit, said first capillary tube reducing the pressure of the refrigerant from a supercritical pressure to a relatively lower pressure and wherein the refrigerant is passed through said first capillary tube at a velocity having a maximum value substantially equivalent to a critical flow velocity of the refrigerant;

    means for controlling the temperature of the refrigerant in said first capillary tube; and

    second capillary tube operably disposed in said fluid circuit between said first capillary tube and said second heat exchanger and a flash gas vessel operably disposed in said fluid circuit between said first and second capillary tubes, said compressor comprising a first compressor mechanism and a second compressor mechanism, and wherein a fluid line provides fluid communication from said flash as vessel to a point between said first and second compressor mechanisms, said fluid line including a third capillary tube.

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