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Dual thermochromic liquid crystal temperature sensing for refrigerant charge indication

  • US 7,552,596 B2
  • Filed: 12/27/2004
  • Issued: 06/30/2009
  • Est. Priority Date: 12/27/2004
  • Status: Expired due to Fees
First Claim
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1. A method of determining the sufficiency of refrigerant charge in a refrigeration system having a compressor, a condenser, an expansion device and an evaporator fluidly connected in serial refrigerant flow relationship comprising the steps of:

  • sensing the temperature of the liquid refrigerant leaving the condenser;

    sensing the outdoor temperature; and

    visually, simultaneously displaying by way of positional indications on respective thermochromic strips, both said sensed liquid refrigerant temperature and said sensed outdoor temperature such that the relative positions of the positional indications are indicative of refrigerant charge sufficiency in the system.

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