High performance heat transfer tube for heat exchanger

Details High performance heat transfer tube for heat exchanger High performance heat transfer tube for heat exchanger

1988-09-15

1990-07-03

Michalsky, Gerald A.

Heat exchange

With coated, roughened or polished surface

165179, F28F 140

Patent

active

049382829

ABSTRACT:
A high-performance heat transfer tube for an evaporator of an air conditioning or refrigeration system is formed on a grooved mandrel that has a sufficient number of grooves, such as 60 to 90 for a 5/8 inch tube, to produce a small-pitch internal rib enhancement. The small pitch ensures that the spaces or grooves between ribs are about two to five times the characteristic film thickness of the refrigerant liquid on the inside of the tube. This construction permits use of a thinner tube wall starting blank without loss of strength. Lands or unworked portions can be left at the tube ends to facilitate flaring into a tube sheet.

REFERENCES:
patent: 2279548 (1942-04-01), Bailey
patent: 2678224 (1954-05-01), Kooistra
patent: 3681938 (1972-08-01), Blomberg et al.
patent: 4044797 (1977-08-01), Fujie et al.
patent: 4059147 (1977-11-01), Thorne
patent: 4118944 (1978-10-01), Lord et al.
patent: 4425696 (1984-01-01), Torniainen
patent: 4438807 (1984-03-01), Mathur et al.
patent: 4658892 (1987-04-01), Shinohara et al.
patent: 4660630 (1987-04-01), Cunningham et al.
patent: 4705103 (1987-11-01), Zogg et al.

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