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:
Jul. 10, 2012
Filed:
May. 11, 2005
Zhi Xin LI, Beijing-shi, CN;
Ji an Meng, Beijing-shi, CN;
Mitsuharu Numata, Sakai, JP;
Kazushige Kasai, Sakai, JP;
Zhi xin Li, Beijing-shi, CN;
Ji an Meng, Beijing-shi, CN;
Mitsuharu Numata, Sakai, JP;
Kazushige Kasai, Sakai, JP;
Tsinghua University, Beijing, CN;
Daikin Industries, Ltd., Osaka, JP;
Abstract
The present invention relates to a hot water heat transfer pipe that exchanges heat between its interior and exterior. A plurality of projections, each having a height in the range of 0.8-2.0 mm or 0.1-0.25 times the inner diameter, is provided in at least one part of an inner surface of a portion of the heat transfer pipe positioned in a section where the Reynolds number of the fluid flowing in the interior is less than 7,000 to improve the heat transfer performance in the low Reynolds number zone and minimize pressure loss inside the pipe.