Self heating refrigerator

摘要

A refrigerated display case having a mechanism for impeding the formation of condensation around the frame of the opening of the display case or at the junction of a door and a case frame of the display case. In one preferred embodiment, the ballast used in connection with the lights on commercial refrigerators and freezers are secured to the base in a manner which allows the heat generated by the ballast to be used to raise the temperature of the case frame. In another preferred embodiment the return conduit of the refrigeration system is employed adjacent the case frame for transferring heat from the refrigerant in the conduit to raise the temperature of the case frame as well as to increase the efficiency of the refrigeration system. In both of these embodiments, electrical resistance wires are included to supplement the heating provided by the ballast and the refrigeration system to ensure that condensation is prevented from forming on a frame or other desired portions of the case. These electrical resistance wires are included with an adjustable temperature sensing circuit which places the wires in operative mode only when needed.