Internally finned heat transfer tube with staggered fins of varying height
AssigneeWieland-Werke AG
InventorsChristoph Walther, Rolf Wamsler
Life of this patent
Estimating the term…
Abstract
A heat transfer tube (1) with a finned inner surface, which is divided into at least two zones (Z1 to Zm) in peripheral direction. The fins (2, 3), which extend at an angle of inclination α with respect to the longitudinal axis of the tube, are arranged in the individual zones (Z1 to Zm) in any desired periodic combination and sequence of at least two fin heights (H1 to Hn, H1>H2> . . . >Hn). Adjacent zones border thereby on one another so that the fin sequence is staggered for at least one fin in longitudinal direction of the tube. Modifications include the finned inner surface being divided into groups of zones, in which the angle of inclination of the fins is uniform, however, varies between adjacent groups.
Claims32
A heat transfer tube having a finned inner surface, which is divided into at least two zones (Z1 to Zm) in peripheral direction, the zones bordering adjacent ones of the zones in a longitudinal direction along the length of the inner surface, whereby individual fins having varying fin height extend at an angle of inclination with respect to a longitudinal axis of the tube, wherein the fins spaced apart in the individual zones (Z1 to Zm) are arranged in any desired periodic sequence of at least two fin heights (H1 to Hn, H1>H2> . . . >Hn), whereby adjacent zones (Z1 to Zm) border one another so that at a transition of two adjacent ones of the zones the fin height changes for at least one of the fins.
A heat transfer tube having an inner surface, the inner surface being divided into at least two zones extending in a peripheral direction about the inner surface, the at least two zones being defined by a transition located therebetween and extending in a longitudinal direction along the length of the inner surface,
- the inner surface of the tube including a plurality of fins extending at an angle of inclination with respect to the longitudinal axis of the tube, each of said fins extending across the at least two zones,
- at least one of said fins having a first fin height at a first portion corresponding to a first one of the zones and having a second different fin height at a second portion corresponding to an adjacent second one of the zones, the change in the fin height occurring at the transition of the at least one fin from the first one of the zones to the second one of the zones.
A heat transfer tube having an inner surface, the inner surface being divided into at least two zones, the two zones extending in a peripheral direction about the inner surface, the at least two zones being defined by a transition located therebetween and extending in a longitudinal direction along the length of the inner surface,
- the inner surface of the tube comprising a plurality of parallel fins extending at an angle of inclination with respect to the longitudinal axis of the tube, each of said fins extending across the at least two zones and at least about substantially the entirety of the inner surface,
- each of said fins having a first fin height and a first fin width at a first portion thereof corresponding to a first one of the zones and having a second different fin height and a second different fin width at a second portion thereof corresponding to an adjacent second one of the zones,
- wherein the change in fin height and width occurs at the transition of the fin from the first one of the zones to the second one of the zones, the change in fin height and width reoccurring at further transitions to additional zones.
Dependencies are inferred from the claim text.