High performance heat transfer surface for high pressure refrige

Details High performance heat transfer surface for high pressure refrige High performance heat transfer surface for high pressure refrige

1990-10-24

1991-10-08

Davis, Jr., Albert W.

Heat exchange

With coated, roughened or polished surface

165184, 2989005, 29890048, F28F 136

Patent

active

050545485

ABSTRACT:
A heat transfer surface for effecting boiling of a high pressure refrigerant in contact with the surface. The surface includes a plurality of spaced apart fins which extend from the side in contact with the boiling fluid. Each of the fins has a base portion joined to the base of the surface and a tip portion. The tip portions are bent over towards the next adjacent one of the fins to define a subsurface channel between adjacent fins. The sub-surface channel has alternating closed sections where a length of the tip portion is bent over by an additional amount so that the length of the tip portion contacts an adjacent fin, and, open sections wherein the bent over tip portion is spaced from the adjacent fin. Each of the open sections has a cross sectional area of from 0.000220 square inches to 0.000440 square inches such that the open sections define alternating re-entrant openings of a size to promote optimum boiling of a high pressure refrigerant. The total open area of the open sections is from 14% to 28% of the total surface area.

REFERENCES:
patent: 3496752 (1970-02-01), Kun et al.
patent: 3696861 (1972-10-01), Webb
patent: 3768290 (1973-10-01), Zatell
patent: 3881342 (1975-05-01), Thorne
patent: 4765058 (1988-08-01), Zohler

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