Refrigerant with lubricating oil for replacement of R22 refrigerant

  • US 8,197,706 B2
  • Filed: 12/06/2010
  • Issued: 06/12/2012
  • Est. Priority Date: 09/08/2003
  • Status: Active Grant
First Claim
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1. In an apparatus designed for use with chlorodifluoromethane refrigerant, the improvement comprising substituting the chlorodifluoromethane with a refrigerant composition designed to achieve a phase change, the refrigerant composition comprising a combination of refrigerant gases, said refrigerant gases consisting of a blend of tetrafluoroethane and pentafluoroethane, the ratio of the tetrafluoroethane to the pentafluoroethane being selected such that the blend exhibits a dew point at about −

  • 32°

    F. or a bubble point at about −


    F., wherein the refrigerant composition further comprises non-refrigerant gas components, said non-refrigerant gas components including a lubricating oil, wherein the lubricating oil is present up to about 20% by weight of the refrigerant gases and is soluble in chlorodifluoromethane, tetrafluoroethane and pentafluoroethane wherein the lubricating oil is selected from the group consisting of napthenic based lubricants and polyol ester.

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