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Method of optimising the performance of refrigerant vaporizers including improved frost control method and apparatus

  • US 5,233,841 A
  • Filed: 06/28/1991
  • Issued: 08/10/1993
  • Est. Priority Date: 01/10/1990
  • Status: Expired due to Term
First Claim
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1. A method of optimizing performance of a refrigeration device operated with a refrigerant and fed via an expansion valve, characterized in that:

  • in addition to a supply air temperature, both a vaporization temperature and an air cooler outlet temperature at an outlet tube are measured and a first temperature difference value measured between said supply air temperature and said vaporization temperature is determined;

    said difference value is multiplied by a factor to provide a computed temperature value and said computed temperature value which is obtained is compared with a second temperature difference value measured between said air cooler outlet temperature at an outlet tube and said vaporization temperature to provide a comparison value; and

    the expansion valve at an inlet side of the refrigerator device is controlled responsive to said comparison value in such a way that said air cooler outlet temperature provides said second temperature difference value at least substantially the same as said computed temperature value.

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