F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
62/25
F25B 13/00 (2006.01) F24F 11/08 (2006.01) F25B 29/00 (2006.01) F25B 47/02 (2006.01)
Patent
CA 1169260
9D-RD-14842 IMPROVED GRAVITY DEFROST ABSTRACT OF THE DISCLOSURE A reverse air cycle type heat pump is provided that utilizes a refrigeration system having a unidirection refrigerant flow wherein the condenser and evaporate retain their functions, but the air directed across them is redirected for different operations. The refrigeration system employed in the air cycle type heat pump is further provided with a secondary defrost circuit that includes the system liquid line and a conduit having a valve which permits refrigerant flow to bypass the compressor upon termination of compressor operation. A sensing means associated with the system expansion device is arranged on the suction line in a manner that allows the expansion device to regulate the flow of refrigerant through the liquid line in the normal manner when the compressor is operating, while allowing unrestrictive refrigerant flow through the liquid line when compressor operation terminates and the system pressure differential is equalized. This defrost circuit causes the relatively cold refrigerant in liquid phase in the evaporator with the flow continuing until the defrost process is completed.
403547
Company General Electric
Eckersley Raymond A.
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