Heat transfer tube with grooves in inner surface of tube

Details Heat transfer tube with grooves in inner surface of tube Heat transfer tube with grooves in inner surface of tube

1998-01-16

1999-06-29

Leo, Leonard R.

Heat exchange

With coated, roughened or polished surface

165183, 165184, 165146, F28F 140

Patent

active

059154675

ABSTRACT:
Disclosed is a heat transfer tube with grooves in an inner surface thereof, which is excellent in both evaporation performance and condensation performance. In the heat transfer tube with grooves in an inner surface thereof according to the present invention, groove processing regions 1 having a width W1 and groove processing regions 2 having a width W2 are alternately arranged in the inner surface thereof, and a linear groove region 3 having a width W3 extending in a longitudinal direction of the tube is arranged between the groove processing region 1 and the groove processing region 2. The width W1 is larger than the width W2. A group of grooves within the groove processing region 1 are helically formed at a torsional angle .theta.1 with respect to a longitudinal direction of the tube, and a group of grooves within the groove processing region 2 are at a torsional angle .theta.2 different from .theta.1 with respect to the longitudinal direction of the tube and helically formed so that a torsional direction thereof is reversed to a torsional direction of the groove processing region 1.

REFERENCES:
patent: 5655599 (1997-08-01), Kasprzyk
patent: 5704424 (1998-01-01), Kohno et al.

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