Refrigeration system gravity defrost

Details Refrigeration system gravity defrost Refrigeration system gravity defrost

1981-06-04

1982-08-31

Makay, Albert J.

Refrigeration

Automatic control

Selective heating or cooling

62196R, 62197, 62275, 62278, F25B 2900, F25B 4700

Patent

active

043465668

ABSTRACT:
A reverse air cycle type heat pump is provided that utilizes a refrigeration system having a unidirection refrigerant flow wherein the condenser and evaporator retain their functions, but the air directed across them is redirected for different operations. The refrigeration system is provided with a secondary defrost circuit including a first conduit between the upper portion of the evaporator and the compressor casing and a second conduit having a valve which permits refrigerant flow to by-pass the expansion device only when compresssor operation terminates and the system pressure differential is equalized. This defrost circuit causes the relatively warm refrigerant in gaseous phase in the compressor to displace the relatively cold refrigerant in liquid phase in the evaporator with the flow continuing until the defrost process is completed.

REFERENCES:
patent: 2039089 (1936-04-01), Koch
patent: 2175913 (1939-10-01), Philipp
patent: 2878657 (1959-03-01), Atchison
patent: 3159981 (1964-12-01), Huskey
patent: 3370437 (1968-02-01), Jacobs
patent: 3511060 (1970-05-01), Bodcher
patent: 3555842 (1971-01-01), Bodcher
patent: 3871187 (1975-03-01), Skvarenina
patent: 4027497 (1977-06-01), Thurman
patent: 4158950 (1979-06-01), McCarty
patent: 4285210 (1981-08-01), McCarty

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