Heat exchange – With coated – roughened or polished surface
Patent
1985-09-18
1987-12-29
Cline, William R.
Heat exchange
With coated, roughened or polished surface
165179, 165110, 165184, F28F 1318, F28F 1902
Patent
active
047154365
ABSTRACT:
A heat transfer tube has at least a row of projections provided on its inner surface at regular intervals along a spiral curve thereof. The row of projections are formed by plastic deformation of part of the heat transfer tube, which is effected by pressing a rolling disc having projections against the outer surface of the heat transfer tube. The projections have smooth curved surfaces. The height of the projections ranges from 0.45 mm to 0.6 mm, their pitch along the spiral curve ranges from 3.5 mm to 5 mm, and their pitch in the axial direction ranges from 5 mm to 9 mm.
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Kuwahara Heikichi
Nakayama Wataru
Oizumi Kiyoshi
Sugimoto Shigeo
Takahashi Kenji
Cline William R.
Ford John K.
Hitachi , Ltd.
Hitachi Cable Ltd.
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