Importance

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Abstract

A refrigeration system including a refrigeration control system for controlling the operation of the refrigeration system so as to insure that the temperature of the refrigerant discharged from the evaporator coil is above the saturation temperature. The refrigeration system includes at least one refrigerated display case having an evaporator within the primary air conduit and an expansion valve coupled to the inlet end of the evaporator coil. The control system includes: a pressure sensor arranged within the refrigerant discharge line, i.e. suction line to compressor, from the evaporator coil; a first temperature sensor arranged at the air discharge side of the evaporator coil for sensing the temperature (T.sub.1) of the air that has passed over the evaporator coil, a second temperature sensor arranged adjacent to the refrigerant discharge end of the evaporator coil for measuring the temperature (T.sub.2) of the refrigerant discharged from the evaporator coil and a third temperature sensor arranged adjacent the inlet end of the evaporator coil for sensing the temperature (T.sub.3) of the refrigerant flowing into the evaporator coil. Based upon a comparison of temperatures T.sub.1, T.sub.2 and T.sub.3 a series of output control signals are provided for controlling the operation of the expansion valve.

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First Claim