The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 2003
Filed:
Jun. 11, 2002
Applicant:
Inventors:
Assignee:
Kobe Steel, Ltd., Kobe, JP;
Primary Examiner:
Int. Cl.
CPC ...
F28F 1/42 ;
U.S. Cl.
CPC ...
F28F 1/42 ;
Abstract
A heat transfer tube for a falling film type evaporator, in which water spreading characteristics, particularly the water spreading characteristics in the tube axis direction, enhancing the heat transfer ability. Three types of projections and are formed on an external surface of a heat transfer tube body . A respective plurality of projections to are arranged spirally in parallel to one another, forming projection groups to . The number of each projection group to is one. Pitches P to P for the projections to are in the range of 0.35 mm≦P P P 5.95 mm. Heights h to h of the projections to are in the range of 0.1 mm≦h h h 0.5 mm. Pitches for the projection groups to is in the range of 0.72 to 1.12 mm.