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Heat exchanger

Patent:

Abstract

The purpose of this construction is the improvement of heat transfer in finned tube heat exchangers, and therefore the improvement of its efficiency or its output per unit volume. This is achieved by preventing the formation of flow boundary layers in gaseous fluid. This effect always occurs on flow of smooth adjacent laminae, and especially if these have pipes carrying liquid passing through them; it worsens the heat transfer of such a boundary layer considerably compared to that in the turbulent range. The fins, which have several rows of heat exchange tubes passing through them, are fixed at a small spacing on theses tubes. The fins have slots cut in them by pressing or punching, where the pressed-out material remains as a web, which runs parallel to the level of the fin and at a small distance from it. These webs and slots are arranged radially around every tube hole, e.g. 6 in number. For a suitable small tube spacing, two adjacent tubes opposite each other have one common slot. Many variants of such slot arrangements are illustrated.
Publication Date:
Apr 30, 1975
Product Type:
Patent
Report Number:
DE 2441652; A
Reference Number:
ERA-03-041253; EDB-78-080665
Subject:
42 ENGINEERING; HEAT EXCHANGERS; DESIGN; EFFICIENCY; FINS; HEAT TRANSFER; PIPES; TUBES; ENERGY TRANSFER; 420200* - Engineering- Facilities, Equipment, & Techniques
OSTI ID:
7287382
Country of Origin:
Germany
Language:
German
Submitting Site:
DE
Size:
Pages: 27
Announcement Date:

Patent:

Citation Formats

Harada, F, Yanagida, T, Fujie, K, and Futawatari, H. Heat exchanger. Germany: N. p., 1975. Web.
Harada, F, Yanagida, T, Fujie, K, & Futawatari, H. Heat exchanger. Germany.
Harada, F, Yanagida, T, Fujie, K, and Futawatari, H. 1975. "Heat exchanger." Germany.
@misc{etde_7287382,
title = {Heat exchanger}
author = {Harada, F, Yanagida, T, Fujie, K, and Futawatari, H}
abstractNote = {The purpose of this construction is the improvement of heat transfer in finned tube heat exchangers, and therefore the improvement of its efficiency or its output per unit volume. This is achieved by preventing the formation of flow boundary layers in gaseous fluid. This effect always occurs on flow of smooth adjacent laminae, and especially if these have pipes carrying liquid passing through them; it worsens the heat transfer of such a boundary layer considerably compared to that in the turbulent range. The fins, which have several rows of heat exchange tubes passing through them, are fixed at a small spacing on theses tubes. The fins have slots cut in them by pressing or punching, where the pressed-out material remains as a web, which runs parallel to the level of the fin and at a small distance from it. These webs and slots are arranged radially around every tube hole, e.g. 6 in number. For a suitable small tube spacing, two adjacent tubes opposite each other have one common slot. Many variants of such slot arrangements are illustrated.}
place = {Germany}
year = {1975}
month = {Apr}
}