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.
Claims25
A heat transfer tube having a finned inner surface, which is divided into at least two zones (Z1 to Zm) in peripheral direction, whereby fins of varying fin height, which fins extend at an angle of inclination with respect to the longitudinal axis of the tube, alternate in adjacent ones (Z1 to Zm), wherein the fins in the individual zones (Z1 to Zm) are arranged in longitudinal direction of the tube in any desired periodic combination and 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 the transition of two zones the fin sequence is staggered with respect to one another for at least one fin in longitudinal direction of the tube.
The heat transfer tube having a finned inner surface, which is divided into at least two groups (G1 to Gp) of zones (Z1 to Zm) in peripheral direction, whereby each group includes at least two zones, and the angle of inclination of the fins in the zones of one group is each uniform, however, varies between the adjacent groups such that when counting starting with one group G1 in groups with an uneven number a different angle of inclination of the fins exists than the angle of inclination in groups with an even number, wherein the fins in the individual zones (Z1 to Zm) are arranged in longitudinal direction of the tube in any desired periodic combination and sequence of at least two fin heights (H1 to Hn, H1>H2> . . . >Hn), whereby adjacent zones (Z1 to Zm) of one group border one another so that at the transition of two zones of one group the fin sequence is staggered with respect to one another for at least one fin in longitudinal direction of the tube.
The heat transfer tube having a finned inner surface, which is divided in peripheral direction into at least two groups (G1 to Gp) of zones (Z1 to Zm), whereby each group includes at least two zones and the angle of inclination of the fins is uniform each in the zones of one group, however, is designed such between adjacent groups that when counting starting with one group G1 in groups with uneven numbers an angle of inclination of the fins exists, in groups with an even number an angle of inclination of the fins, which angle of inclination is symmetrically opposite with respect to the boundary line between the adjacent groups, exists wherein the fins in the individual zones (Z1 to Zm) are arranged in longitudinal direction of the tube in any desired periodic combination and sequence of at least two fin heights (H1 to Hn, H1>H2> . . . >Hn), whereby adjacent zones (Z1 to Zm) of one group border one another so that at the transition of two zones of one group the fin sequence is staggered with respect to one another for at least one fin in longitudinal direction of the tube.
Dependencies are inferred from the claim text.