F - Mech Eng,Light,Heat,Weapons – 25 – D
Patent
F - Mech Eng,Light,Heat,Weapons
25
D
62/37
F25D 21/12 (2006.01) F25B 39/04 (2006.01) F25B 47/02 (2006.01) F25B 5/00 (2006.01)
Patent
CA 1044032
REFRIGERATION AND HOT GAS DEFROST SYSTEM ABSTRACT A refrigeration system including at least one compressor, a condenser for receiving hot gaseous refrigerant from the compressor and condensing same, a discharge line for supplying hot gaseous refrigerant from the compressor to the condenser, a plurality of expansion valves associated with a plurality of evaporators, a liquid line for passing condensed refrigerant from the output of the condenser to the expansion valves and evaporators, a return line extending from the evaporators to the input of the compressor to supply refrigerant thereto, a receiver for holding a reservoir of refrigerant, a bypass line connecting the receiver to the liquid line, a hot gas defrost means for selectively passing hot gaseous refrigerant through one or more of the evaporators for defrost and a balancing line operable during defrost responsive to a pressure within the receiver greater than within the discharge line to provide fluid flow communication therebetween to equalize refrigerant pressure between the receiver and discharge line thereby allowing the system head pressure to rapidly increase to a level to initiate defrost flow. The present invention may also include a head pressure control solenoid operable to modulate flow through the discharge line responsive to a predetermined low pressure in the receiver during the defrost of any evaporator. Also the present system may include a receiver line connected between the receiver and the hot gas discharge line to maintain a minimum receiver pressure to insure full and efficient operation of the expansion valves associated with each evaporator.
256561
Klossman Charles W.
Willitts Benjamin R.
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