Kysor Industrial Corporation

William C Johnston

Sterling Beckwith

An open-type air defrost refrigerated display employing recirculatory refrigerated air flow for cooling, and reverse air flow into the ambient and from the ambient for defrost, there being a return air grille opening which is bioriented, with portions oriented to receive recirculatory cold air flow from across the display access opening during refrigeration, and portions oriented to discharge reverse flow defrost air into the ambient during defrost. These second portions are aerodynamically aligned with the adjacent passage from whence the reverse flow defrost air flows. The passage means preferably includes, between the refrigeration coil and the refrigerated air outlet, damper means for restricting the recirculatory refrigerated air flow a controlled amount, while allowing unrestricted reverse defrost air flow therethrough.

Air defrost display case

An air defrost reach-in refrigerated display case employing aerodynamic isolation of the coil from the product storage and display space during defrost. The fans and refrigeration coil are in a chamber separated from the display space, there being restricted flow flues between this chamber and the display space. Ambient air inlet and discharge ports astraddle the coil and fans, and between the cabinet exterior and this chamber enables short circuit flow of ambient defrosting air through the ports for defrosting of the coil when doors on the ports are open, without significant flow into the storage and display space.

Air defrost reach-in refrigerated display cabinet

An energy saving refrigeration system as for refrigerated display cases in stores, free of the usual winter head pressure controls on the condenser equipment, capable of functioning satisfactorily with two-phase, liquid-gas mixtures of refrigerant inlet flow, there being a pair of valves immediately upstream of the evaporator, one being an expansion valve, and the other being a pressure regulator just upstream of the expansion valve adjusted such as to maintain a fixed discharge pressure to the expansion valve, this regulator discharge pressure set sufficiently above the evaporator boiling pressure and set sufficiently below the minimum inlet pressure to the pressure regulator.

Growing community of inventors

Atlanta, GA, United States of America

William C Johnston