Title:
HEAT TRANSFER PIPE FOR OVERCOOLING DOUBLE-PIPE HEAT EXCHANGER
Document Type and Number:
Japanese Patent JP2015232415
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a heat transfer pipe for an overcooling double-pipe heat exchanger capable of reducing the head loss of annulus fluid while improving the coefficient of heat transfer when running low viscous fluid through an annular part of a double-pipe heat exchanger at a high flow rate.SOLUTION: A heat transfer pipe for an overcooling double-pipe heat exchanger comprises: a plurality of trapezoidal projections formed on a pipe external surface to a rectangular shape in plan view so as to align in a pipe axial direction and a tube circumferential direction; and one or a plurality of ribs spirally formed on a pipe inner surface. In the projections, the width of a first groove between projections adjacent to each other in the pipe axial direction ranges from 0.3 mm to 0.80 mm; and the width of a second groove between projections adjacent to each other in the tube circumferential direction ranges from 0.10 mm to 0.30 mm. In the ribs, the width of a groove between ribs adjacent to each other in the pipe axial direction ranges from 0.15 mm to 1.10 mm; and a lead angle, which is an angle of the rib to the pipe axial direction, ranges from 40° to 65°.
Inventors:
TAKAHASHI HIROYUKI
IWAMOTO HIDEKI
IWAMOTO HIDEKI
Application Number:
JP2014119069A
Publication Date:
December 24, 2015
Filing Date:
June 09, 2014
Export Citation:
Assignee:
KOBELCO & MAT COPPER TUBE INC
International Classes:
F28F1/42; F25B40/00; F28D7/10; F28F13/12
Domestic Patent References:
| JP2013079763A | 2013-05-02 | |||
| JP2008274426A | 2008-11-13 | |||
| JP2004301440A | 2004-10-28 | |||
| JP2006090657A | 2006-04-06 | |||
| JP2003287385A | 2003-10-10 | |||
| JP2000193345A | 2000-07-14 |
Attorney, Agent or Firm:
Masanori Fujimaki