Construction of a heat transfer wall of a heat transfer pipe

Heat exchange – With coated – roughened or polished surface

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165179, 165110, 165184, F28F 1318, F28F 1902

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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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patent: 4330036 (1982-05-01), Satoh et al.
patent: 4332294 (1982-06-01), Drefahl et al.
patent: 4425942 (1984-01-01), Hage et al.
patent: 4549606 (1985-10-01), Sato et al.

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