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Electronic temperature control system

  • US 4,478,051 A
  • Filed: 05/06/1983
  • Issued: 10/23/1984
  • Est. Priority Date: 05/06/1983
  • Status: Expired due to Term
First Claim
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1. A refrigeration control system for a refrigeration system including a refrigerated display case with a primary air conduit having an air outlet opening and an air inlet opening, an evaporator coil arranged within the primary air conduit for refrigerating air passing through such conduit, and an expansion valve coupled to the inlet end of the evaporator coil, said refrigeration control system comprising:

  • a pressure sensing means arranged at the refrigerant discharge line from the evaporator coil for sensing the pressure (P) of the refrigerant within such discharge line;

    means for determining the saturation temperature (Tsat) of the refrigerant from the measurement of pressure P;

    means for setting a level of superheat (Tsh) desired within the refrigerant discharged from the evaporator coil and setting a desired temperature (T2set) for such discharge refrigerant by
    
    
    space="preserve" listing-type="equation">T.sub.2set =T.sub.sat +T.sub.s ;

    a second temperature sensing means arranged adjacent to the refrigerant discharge line from the evaporator coil for measuring the temperature (T2) of the refrigerant discharged from the evaporator coil;

    comparator means for comparing temperature T2 with temperature T2set and providing an output comparison signal if T2 <

    T2set ; and

    ,control means receiving the output comparison signal and providing an output control signal for controlling operation of the refrigeration system for maintaining temperature T2 equal to or above temperature T2set.

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