Global Patent Index - EP 2042825 A4

EP 2042825 A4 20100616 - FIN-AND-TUBE TYPE HEAT EXCHANGER, AND ITS RETURN BEND PIPE

Title (en)

FIN-AND-TUBE TYPE HEAT EXCHANGER, AND ITS RETURN BEND PIPE

Title (de)

GERIPPTER ROHRWÄRMETAUSCHER UND RÜCKLAUFBOGENROHR

Title (fr)

ÉCHANGEUR DE CHALEUR DE TYPE À AILETTES ET TUBES, ET SON TUBE DE RETOUR COUDÉ

Publication

EP 2042825 A4 20100616 (EN)

Application

EP 07790611 A 20070711

Priority

  • JP 2007063807 W 20070711
  • JP 2006193721 A 20060714

Abstract (en)

[origin: EP2042825A1] The invention provides a fin-and-tube heat exchanger using a return bend tube that allows further enhancement of the evaporative performance of the heat exchanger. The fin-and-tube heat exchanger, where a refrigerant is supplied inside tubing, has a hairpin tube portion where a plurality of hairpin tubes are arranged, a return bend tube portion where there are arranged a plurality of return bend tubes joined to respective hairpin tube ends of the hairpin tube portion, and a fin portion comprising a plurality of fins arranged at a predetermined spacing on the outer surface of the hairpin tubes. The heat exchanger comprises first grooves formed on the tube inner surface of the return bend tube. A first groove pitch (P1) of the first grooves in a cross section perpendicular to a tube axis, and a second groove pitch (P2) of spiral-shaped second grooves formed on the inner surface of the hairpin tube in a cross section perpendicular to a tube axis, satisfy a groove pitch ratio (P1/P2) of 0.65 to 2.2, while a first groove cross-sectional area (S1) per groove of the first grooves in a cross section perpendicular to the tube axis, and a second groove cross-sectional area (S2) per groove of the second grooves in a cross section perpendicular to the tube axis satisfy a groove cross-sectional area ratio (S1/S2) of 0.3 to 3.6.

IPC 8 full level

F28D 1/047 (2006.01); F25B 1/00 (2006.01); F25B 39/02 (2006.01); F28F 1/40 (2006.01)

CPC (source: EP KR)

F25B 1/00 (2013.01 - KR); F25B 39/02 (2013.01 - EP KR); F28D 1/047 (2013.01 - KR); F28D 1/0477 (2013.01 - EP); F28F 1/32 (2013.01 - EP); F28F 1/40 (2013.01 - EP KR); F28F 1/42 (2013.01 - EP); F28F 1/422 (2013.01 - EP); F28F 9/26 (2013.01 - EP); F25B 2500/01 (2013.01 - EP); F25B 2500/09 (2013.01 - EP); F28F 9/0246 (2013.01 - EP)

Citation (search report)

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

DOCDB simple family (publication)

EP 2042825 A1 20090401; EP 2042825 A4 20100616; EP 2042825 B1 20181003; CN 101466992 A 20090624; CN 101466992 B 20101222; JP 2008020150 A 20080131; JP 4728897 B2 20110720; KR 20080108620 A 20081215; MY 144548 A 20110930; WO 2008007694 A1 20080117

DOCDB simple family (application)

EP 07790611 A 20070711; CN 200780021377 A 20070711; JP 2006193721 A 20060714; JP 2007063807 W 20070711; KR 20087027945 A 20081114; MY PI20084450 A 20070711