EP 0518312 A1 19921216 - Heat transfer tube with grooved inner surface.
Title (en)
Heat transfer tube with grooved inner surface.
Title (de)
Wärmetauscherrohr mit gerillter Innenfläche.
Title (fr)
Tube de transfert de chaleur à surface interne rayée.
Publication
Application
Priority
JP 16762591 A 19910611
Abstract (en)
The present invention provides a heat transfer tube with grooved inner surface (1) superior in heat transfer performance and more lightweight. The said heat transfer tube with grooved inner surface (1) has spiral grooves (2) on its inner surface (1) in which the helix angle (alpha) of grooves from the tube axis ranges from 16 to 22 DEG , the ratio (Hf/Di) of the groove depth (Hf) to the inside diameter (Di) of the tube ranges from 0.023 to 0.025, the wall thickness (Tf) between the groove bottom and the tube surface ranges from 0.25 to 0.35 mm, and in-tube fluid causes a phase change; wherein the ratio (W/Hf) of the groove bottom width (W) to the groove depth (Hf) on a cross section perpendicular to the axis is set to 1.22-1.27 and the apex angle (gamma) of a ridge formed between grooves is set to 50-55 DEG at the cross section perpendicular to grooves. <IMAGE>
IPC 1-7
IPC 8 full level
F28F 1/40 (2006.01); F28F 13/18 (2006.01)
CPC (source: EP)
F28F 1/40 (2013.01); F28F 13/187 (2013.01)
Citation (search report)
- [AD] US 4658892 A 19870421 - SHINOHARA YOSHIHIRO [JP], et al
- [AD] EP 0148609 A2 19850717 - HITACHI CABLE [JP]
- [A] DE 3414230 A1 19851024 - BEHM ERNST, et al
- [A] DE 2552679 A1 19760616 - HITACHI LTD
Designated contracting state (EPC)
BE DE ES FR GB GR IT PT
DOCDB simple family (publication)
EP 0518312 A1 19921216; FI 922701 A0 19920610; FI 922701 A 19921212; JP H0579783 A 19930330
DOCDB simple family (application)
EP 92109811 A 19920611; FI 922701 A 19920610; JP 16762591 A 19910611