Title:
給湯用伝熱管
Document Type and Number:
Japanese Patent JP4942773
Kind Code:
B2
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 whose height (H1) is in the range of 0.8 - 2.0 mm or 0.1 - 0.25 times the inner diameter (D), is provided in at least one part of the inner surface of a portion of the heat transfer pipe positioned in a section where the Reynolds number (Re) of the fluid flowing in the interior is less than 7,000. As a result, with a simple structure, the heat transfer performance in the low Reynolds number zone is improved, and the pressure loss inside the pipe is small.
Inventors:
Lee Zhisin
Meng
Numata Mitsuharu
Kazushige Kasai
Meng
Numata Mitsuharu
Kazushige Kasai
Application Number:
JP2009001139A
Publication Date:
May 30, 2012
Filing Date:
January 06, 2009
Export Citation:
Assignee:
TSINGHUA UNIVERSITY
Daikin Industries, Ltd.
Daikin Industries, Ltd.
International Classes:
F28F13/12; F28F1/40
Domestic Patent References:
| JP2005009833A | ||||
| JP61289293A | ||||
| JP2004085090A | ||||
| JP9243284A |
Attorney, Agent or Firm:
Yukio Ono
Hidetada Kato
Hidetada Kato