Heat exchange – With coated – roughened or polished surface
Patent
1978-06-30
1980-04-01
Richter, Sheldon Jay
Heat exchange
With coated, roughened or polished surface
165184, F28B 908, F28F 136
Patent
active
041956885
ABSTRACT:
A heat-transfer wall kept at a low temperature so that hot vapor brought into contact with its surface condenses thereon. The surface is grooved at a fine pitch, having thin and sharply tapering ridges in between, with shallower fine-pitch grooves or notches formed in the ridges. The wall may be that of a tube, the grooves may consist of a continuous root in the form of a helix, and the ridges may be bent into the grooves to form rounded crests. The wall contour is made by forming fine-pitch shallow grooves crosswise by knurling and then forming fine-pitch deep grooves by cutting and turning up the surfaces in a plowing manner, for example on a lathe. A grooved die may be used to deform and bend the edges of the ridges toward the deep grooves.
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patent: 3768290 (1973-10-01), Zatell
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patent: 4059147 (1977-11-01), Thorne
Daikoku Takahiro
Fujie Kunio
Kakizaki Kimio
Kuwahara Heikichi
Nakayama Wataru
Hitachi , Ltd.
Hitachi Cable Ltd.
Richter Sheldon Jay
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