Heat transfer tube for absorption refrigerating machine

Details Heat transfer tube for absorption refrigerating machine Heat transfer tube for absorption refrigerating machine

1994-12-27

1996-11-12

Leo, Leonard R.

Heat exchange

Tubular structure

165146, 165179, 165184, 138 38, F28F 108, F28F 142

Patent

active

055730620

ABSTRACT:
One heat transfer tube for an absorption refrigerating machine of the present invention has a plurality of grooves formed on the circumferential surface of a tube at uniformly angular intervals to extend continuously or discontinuously in the length direction of the tube, wherein the width and/or depth of each groove gently varies in the length direction of the groove, and the height of each ridge between the mutually adjacent grooves gently varies from the axial tube center in the length direction of the ridge. Another heat transfer tube of the present invention has a large number of concave portions formed in rows on the circumferential surface of the tube at predetermined angular intervals and each having a gently down-grade surface extending in the tube length direction to gradually get closer to the axial tube center and a gently up-grade surface extending continuously from the down-grade surface in the tube length direction to gradually become more distant from the axial tube center. Since the heat transfer tube has a plurality of grooves and ridges or concave portions formed on the circumference of the tube, the diffusion and interfacial turbulence of a medium can be substantially accelerated in both the axial and circumferential directions to display higher heat transfer performance.

REFERENCES:
patent: 910192 (1909-01-01), Grouvelle et al.
patent: 1713020 (1929-05-01), Bowne
patent: 2080626 (1937-05-01), Mojonnier
patent: 2122504 (1938-07-01), Wilson
patent: 2663321 (1953-12-01), Jantsch
patent: 3530923 (1970-09-01), Mattern
patent: 3724523 (1973-04-01), Mattern
patent: 4014962 (1977-03-01), Del Notario

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