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Method of monitoring refrigerant level

  • US 20040159114A1
  • Filed: 02/10/2004
  • Published: 08/19/2004
  • Est. Priority Date: 12/11/2000
  • Status: Active Grant
First Claim
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1. A method of refrigerant level monitoring in a refrigerant circuit of an air-conditioning or heat-pump system having a compressor and a refrigerant which may, depending on the operating point, be operated in the supercritical range, the method comprising:

  • at least in-operation level monitoring with the compressor switched on, measuring the refrigerant superheat (dTü

    ) at the evaporator of the system, and determining whether the measured superheat (dTü

    ) lies above a predetermined limiting value (dTü

    G), as an indication of improper filling.

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