# US 2018/0023901 A1 · Arrowhead fin for heat exchange tubing

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2018/0023901 A1
- Document ID: US20180023901A1
- Status: Published application
- Kind: A1
- Application number: 15/425,454
- Filed: 2017-02-06
- Published: 2018-01-25
- Earliest claimed: 2016-02-04
- Assignees: Evapco, Inc.
- Applicants: Evapco, Inc.
- Inventors: Thomas W. Bugler; Jean-Pierre Libert; Mark Huber; Aaron Reilly
- Web page: https://patentgrep.com/patent/US20180023901A1

## CPC

- F28F 1/16: the means being integral with the element, e.g. formed by extrusion (F28F1/22 takes precedence)
- F28B 1/06: using air or other gas as the cooling medium
- F28F 1/04: polygonal, e.g. rectangular {(F28F1/022 takes precedence)}
- F28F 1/126: {consisting of zig-zag shaped fins (F28F1/105 takes precedence)}
- F28F 1/26: the means being integral with the element (F28F1/32 takes precedence)
- F28F 1/40: the means being only inside the tubular element
- F28F 13/12: by creating turbulence, e.g. by stirring, by increasing the force of circulation (F28F13/08 takes precedence)
- F28F 1/02: Tubular elements of cross-section which is non-circular (F28F1/08, F28F1/10 take precedence)
- F28F 3/025: {the means being corrugated, plate-like elements}
- F28F 2215/10: Secondary fins, e.g. projections or recesses on main fins
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- F28B: STEAM OR VAPOUR CONDENSERS (condensation of vapours B01D5/00; steam engine plants having condensers F01K; liquefaction of gases F25J; details of heat-exchange and heat-transfer arrangements of general application F28F)

## Abstract

A new heat exchange tube fin design in which a plurality of arrowhead shapes are pressed into or embossed onto each fin, the arrowhead shape defined by two intersecting wedge sections. The pressed arrowhead shapes are grouped into nested pairs, and one of the arrowheads in a pair is pressed as a positive relative to the fin plane and the other of the pair is pressed as a negative relative to the fin plane. The arrowhead pairs are placed in rows parallel to the air flow direction and arrowhead pairs in one row are preferably staggered relative to the arrowhead pairs in the adjacent row along the fin in the air flow direction.

## Claims

### Claim 1

A fin for a heat exchange tube comprising embossed or pressed arrowhead shapes arranged along a longitudinal axis of said fin.

### Claim 2 (depends on 1)

A fin according to claim 1 wherein said arrowhead shapes each comprise two intersecting wedge shapes embossed or pressed into said fin.

### Claim 3 (depends on 1)

A fin according to claim 1, wherein said arrowhead shapes are arranged into pairs, where a pointed end of one arrowhead shape of a pair is nested into a forked end of a second arrowhead shape of a pair.

### Claim 4 (depends on 1)

A fin according to claim 1, wherein said arrowhead shapes are arranged in two or more rows, said rows aligned with a longitudinal axis of said fin.

### Claim 5 (depends on 1)

A fin according to claim 1, wherein a first plurality of said arrowhead shapes are pressed in a first direction perpendicular to a plane of said fin, and a second plurality of said arrowhead shapes are pressed in a second direction perpendicular to said plane of said fin, said second direction opposite to said first direction.

### Claim 6 (depends on 3)

A fin according to claim 3, wherein a first arrowhead shape of an arrowhead pair is pressed in a first direction perpendicular to a plane of said fin, and a second arrowhead shapes of said arrowhead pair is pressed in a second direction perpendicular to said plane of said fin, said second direction opposite to said first direction.

### Claim 7

A heat exchange tube having a fin attached thereto, said fin comprising embossed or pressed arrowhead shapes arranged along a longitudinal axis of said fin.

### Claim 8

A field erected air cooled industrial steam condenser comprising a plurality of finned heat exchange tubes, said heat exchanged tubes each having a plurality of fins attached to an external surface of a flat surface of said tube aligned perpendicular to a longitudinal axis of said tube, said fins comprising embossed or pressed arrowhead shapes arranged along a longitudinal axis of said fin.