Abstract: A metal heat exchanger tube has integral ribs formed on the outside of the tube. The ribs have a rib base, rib flanks, and a rib tip. The rib base protrudes substantially radially from the tube wall. A channel is formed between the ribs, in which channel additional structures spaced apart from each other are arranged. The additional structures divide the channel between the ribs into segments. The additional structures reduce the cross-sectional area in the channel between two ribs through which flow is possible by at least 60% locally and, at least thereby, limit a fluid flow in the channel during operation.

Abstract: The invention relates to a heat exchanger tube having a tube longitudinal axis, wherein fins extend continuously from the tube wall on the tube outer face and/or the tube inner face, or extend axially parallel thereto or in the form of a helix. Continuously extending primary grooves are formed between adjacent fins, said fins have at least one structured area on the tube outer face and/or tube inner face, and the structured area has a plurality of projections of a projection height projecting from the surface, the projections being separated by notches. According to the invention, a plurality of projections are deformed relative one another in pairs to such an extent that cavities are formed between adjacent projections. Furthermore, according to the invention, a plurality of projections are deformed in the direction of the tube wall such that cavities are formed between a respective projection and the tube wall.

Abstract: A heat exchanger tube with a tube axis, a tube wall and with ribs extending around on the tube outer side. The ribs have a rib foot, rib flanks and a rib tip, wherein the rib foot projects substantially radially from the tube wall. The rib flanks are provided with additional structural elements which are arranged laterally on the rib flank. First material projections, which extend substantially in the axial and radial direction, adjoin second material projections which extend substantially in the axial and circumferential direction of the tube, wherein the first and second material projections have a common boundary line. The axial extent of the first material projections along this boundary line is less than the axial extent of the second material projections.

Abstract: The invention relates to heat exchanger tube having a longitudinal tube axis; axially parallel or helically circumferential continuous fins are formed from the tube wall on the outer tube face and/or inner tube face, and continuous primary grooves are formed between adjacent fins; the fins have at least one structured zone on the outer tube face and/or inner tube face, said structured zone being provided with a plurality of projections which project from the surface an have a height such that the projections are separated by notches. According to the invention, the projections are arranged in groups which are periodically repeated along the extension of the fin. Furthermore, at least two notches between the projections within the group have a varying notch depth in a fin.

Abstract: The invention relates to a heat exchanger tube (1) having a tube longitudinal axis (A), a tube wall (2), an outer tube face (21) and an inner tube face (22), wherein axially parallel or helically circumferential continuous fins (3) are formed on the outer tube face (21) and/or inner tube face (22) which fins continuously run from the tube wall, and continuously extending primary grooves (4) are formed between respectively adjacent fins (3). According to the invention, the fins (3) along the fin profile are subdivided into periodically repeating fin sections (31) which are divided into a multiplicity of projections (6) with a projection height (h), wherein the projections (6) are formed between primary grooves (4) by making cuts into the fins (3) at a cutting depth transversely with respect to the fin profile to form fin segments and by raising the fin segments in a main orientation along the fin profile.

Abstract: The invention relates to heat exchanger tube having a longitudinal tube axis; axially parallel or helically circumferential continuous fins are formed from the tube wall on the outer tube face and/or inner tube face, and continuous primary grooves are formed between adjacent fins; the fins have at least one structured zone on the outer tube face and/or inner tube face, said structured zone being provided with a plurality of projections which project from the surface an have a height such that the projections are separated by notches. According to the invention, the projections are arranged in groups which are periodically repeated along the extension of the fin. Furthermore, at least two notches between the projections within the group have a varying notch depth in a fin.

Abstract: The invention relates to a heat exchanger tube (1) having a tube longitudinal axis (A), a tube wall (2), an outer tube face (21) and an inner tube face (22), wherein axially parallel or helically circumferential continuous fins (3) are formed on the outer tube face (21) and/or inner tube face (22) which fins continuously run from the tube wall, and continuously extending primary grooves (4) are formed between respectively adjacent fins (3). According to the invention, the fins (3) along the fin profile are subdivided into periodically repeating fin sections (31) which are divided into a multiplicity of projections (6) with a projection height (h), wherein the projections (6) are formed between primary grooves (4) by making cuts into the fins (3) at a cutting depth transversely with respect to the fin profile to form fin segments and by raising the fin segments in a main orientation along the fin profile.

Abstract: The invention relates to a heat exchanger tube having a tube longitudinal axis, wherein fins extend continuously from the tube wall on the tube outer face and/or the tube inner face, or extend axially parallel thereto or in the form of a helix. Continuously extending primary grooves are formed between adjacent fins, said fins have at least one structured area on the tube outer face and/or tube inner face, and the structured area has a plurality of projections of a projection height projecting from the surface, the projections being separated by notches. According to the invention, a plurality of projections are deformed relative one another in pairs to such an extent that cavities are formed between adjacent projections. Furthermore, according to the invention, a plurality of projections are deformed in the direction of the tube wall such that cavities are formed between a respective projection and the tube wall.

Abstract: A heat exchanger tube with a tube axis, a tube wall and with ribs extending around on the tube outer side. The ribs have a rib foot, rib flanks and a rib tip, wherein the rib foot projects substantially radially from the tube wall. The rib flanks are provided with additional structural elements which are arranged laterally on the rib flank. First material projections, which extend substantially in the axial and radial direction, adjoin second material projections which extend substantially in the axial and circumferential direction of the tube, wherein the first and second material projections have a common boundary line. The axial extent of the first material projections along this boundary line is less than the axial extent of the second material projections.

Abstract: A heat exchanger tube with a tube axis, a tube wall and with ribs extending around on the tube outer side. The ribs have a rib foot, rib flanks and a rib tip, wherein the rib foot projects substantially radially from the tube wall. The rib flanks are provided with additional structural elements which are arranged laterally on the rib flank. First material projections, which extend substantially in the axial and radial direction, adjoin second material projections which extend substantially in the axial and circumferential direction of the tube, wherein the first and second material projections have a common boundary line. The axial extent of the first material projections along this boundary line is less than the axial extent of the second material projections.

Abstract: The invention relates to a metal heat exchanger tube, comprising integral ribs formed on the outside of the tube. Said ribs have a rib base, rib flanks, and a rib tip. The rib base protrudes substantially radially from the tube wall. A channel is formed between the ribs, in which channel additional structures spaced apart from each other are arranged. The additional structures divide the channel between the ribs into segments. The additional structures reduce the cross-sectional area in the channel between two ribs through which flow is possible by at least 60% locally and, at least thereby, limit a fluid flow in the channel during operation.

Abstract: A tube heat exchanger comprising at least one tube extending along a certain axial direction, each tube being provided with heat exchange fins (4) spaced apart from one another along said axial direction and extending radially from said tube, each fins (4) being relief structured to form dimples and a groove/rib (5) arranged at a first distance from said tube, characterized in that said dimples (6) are placed on the outside of the groove/rib and arranged in at least one line surrounding the said groove/rib structure at a second distance from said tube greater than said first distance and in that said groove/rib (5) has a depth along said axial direction greater than the depth of said dimples (6).

Abstract: A heat exchanger tube with a tube axis and with a tube wall having a tube outside and a tube inside, axially parallel or helically encircling inner ribs, with a groove which lies in each case between adjacent inner ribs, being formed from the tube wall on the tube inside, the helix angle, measured with respect to the tube axis, of the inner ribs being smaller than or equal to 45°, the region of the inner ribs which is remote from the tube wall being deformed at regular intervals asymmetrically on one side essentially in the tube circumferential direction, the deformed material of the inner ribs forming protrusions above the groove, the protrusions extending in each case over a finite deformation zone along an inner rib, the markedness of the deformation changing continuously within the deformation zone.

Abstract: A heat exchanger tube with a tube axis and with a tube wall having a tube outside and a tube inside, axially parallel or helically encircling inner ribs, with a groove which lies in each case between adjacent inner ribs, being formed from the tube wall on the tube inside, the helix angle, measured with respect to the tube axis, of the inner ribs being smaller than or equal to 45°, the region of the inner ribs which is remote from the tube wall being deformed at regular intervals asymmetrically on one side essentially in the tube circumferential direction, the deformed material of the inner ribs forming protrusions above the groove, the protrusions extending in each case over a finite deformation zone along an inner rib, the markedness of the deformation changing continuously within the deformation zone.

Abstract: A heat exchanger tube with a tube axis and with a tube wall having a tube outside and a tube inside, axially parallel or helically encircling inner ribs, with a groove which lies in each case between adjacent inner ribs, being formed from the tube wall on the tube inside, the helix angle, measured with respect to the tube axis, of the inner ribs being smaller than or equal to 45°, the region of the inner ribs which is remote from the tube wall being deformed at regular intervals asymmetrically on one side essentially in the tube circumferential direction, the deformed material of the inner ribs forming protrusions above the groove, the protrusions extending in each case over a finite deformation zone along an inner rib, the markedness of the deformation changing continuously within the deformation zone.

Abstract: The invention relates to a heat exchanger tube with at least one structured region on the inside of the tube, which has the following features: a) integral internal ribs of height H run on the inside of the tube in axially parallel or helical-line-shaped manner continuously over the circumference at an angle of inclination ?1, measured with respect to the tube axis, with primary grooves being formed, b) the internal ribs are crossed over the entire circumference of the tube by spaced-apart secondary grooves which, parallel to one another at an angle of inclination ?2, measured with respect to the tube axis, have a notch depth T2 and a groove opening angle ?2, c) the internal ribs and the secondary grooves are crossed over the entire circumference of the tube by spaced-apart tertiary grooves which run continuously over the circumference parallel to one another at an angle of inclination ?3, measured with respect to the tube axis, and have a notch depth T3 and a groove opening angle ?3.

Abstract: The invention relates to a heat exchanger tube with a tube axis, a tube wall and with ribs extending around on the tube outer side. The ribs have a rib foot, rib flanks and a rib tip, wherein the rib foot projects substantially radially from the tube wall. The rib flanks are provided with additional structural elements which are arranged laterally on the rib flank. First material projections, which extend substantially in the axial and radial direction, adjoin second material projections which extend substantially in the axial and circumferential direction of the tube, wherein the first and second material projections have a common boundary line. According to the invention, the axial extent of the first material projections along this boundary line is less than the axial extent of the second material projections.

Abstract: A metallic heat exchanger tube (1) with a tube wall (2) and with integrally formed ribs (3) which run around on the tube outside (21) and which have a rib foot (31), rib flanks (32) and a rib tip (33), the rib foot (31) projecting essentially radially from the tube wall (2), and the rib flanks (32) being provided with additional structural elements which are formed as material projections (4) arranged laterally on the rib flank (32), the material projections (4) having a plurality of boundary faces (41, 42), at least one of the boundary faces (42) of at least one material projection (4) being curved convexly.

Abstract: A metallic heat exchanger tube has fins which run helically around the outside of the tube, are molded integrally therefrom and are of continuous design and the fin base of which protrudes substantially radially from the tube wall, and with primary grooves located between respectively adjacent fins. At least one undercut secondary groove is arranged in the region of the groove base of the primary grooves. The secondary groove is delimited toward the primary groove by a pair of mutually opposite material projections formed from the material of respectively adjacent fin bases and the cross-section thereof is varied at regular intervals without having an influence on the shape of the fins. There is a spacing between the opposite material projections, the spacing being varied at regular intervals, as a result of which local cavities are formed.

Abstract: The invention relates to a metallic heat exchanger tube (1) with a tube wall (2) and with integrally formed ribs (3) which run around on the tube outside (21) and which have a rib foot (31), rib flanks (32) and a rib tip (33), the rib foot (31) projecting essentially radially from the tube wall (2), and the rib flanks (32) being provided with additional structural elements which are formed as material projections (4) arranged laterally on the rib flank (32), the material projections (4) having a plurality of boundary faces (41, 42), at least one of the boundary faces (42) of at least one material projection (4) being curved convexly.