Heat transfer tubes and methods of fabrication thereof

Details Heat transfer tubes and methods of fabrication thereof Heat transfer tubes and methods of fabrication thereof

1997-04-15

1999-12-07

Leo, Leonard

Heat exchange

Tubular structure

Projecting internal and external heat transfer means

165133, 165184, F28F 142

Patent

active

059966866

ABSTRACT:
Heat transfer tubes have an exterior surface in contact with a refrigerant and an interior surface defining a path through which a liquid is conveyed in an axial direction of the tube. The exterior surface of the tube has a plurality of fins formed thereon; the interior surface of the tube has a plurality of ridges formed thereon. The fins have an average width v with respect to the axial direction of the tube and a pitch Q with respect to the axial direction of the tube. A channel is provided between adjacent fins, the channels having a channel bottom of length L with respect to the axial direction of the tube. The ridges have a ridge height (e) and a ridge base width (b). The tubes have a ratio of L/v in a range of from 1.22 to 3.40. L is greater than 45% of fin pitch Q, and is preferably between 45% and 75% of fin pitch Q. A ratio of (e.times.L)/b is in a range of from 0.0062 to 0.0165; a ratio of e/b is in a range of from 0.565 to 0.973.

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patent: 5690167 (1997-11-01), Rieger

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