Heat transfer tubes and method for manufacturing

Details Heat transfer tubes and method for manufacturing Heat transfer tubes and method for manufacturing

1992-06-30

1993-11-09

Rivell, John

Heat exchange

With coated, roughened or polished surface

165179, 165184, F28F 140

Patent

active

052594483

ABSTRACT:
The heat transfer tube of the present invention is provided in an inner surface thereof with a plurality of main grooves and a plurality of narrow grooves. The main grooves have rectangular shaped cross sections, parallel to one another, and extend at an angle to the longitudinal direction of the heat transfer tube. The narrow grooves are formed parallel to one another, extend independently of the main grooves. Each of the narrow grooves has a bottom face and a pair of side faces, the side faces are inclined closely toward the bottom face, and each of the side faces and a part of the bottom face form sharp cuts.

REFERENCES:
patent: 3861462 (1975-01-01), McLain
patent: 4733698 (1988-03-01), Sato
patent: 5052476 (1991-10-01), Sukumoda et al.

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