Conjugate heat transfer analysis of double pane windows

Conjugate heat transfer analysis of double pane windows This study numerically analyzes conjugate heat transfer through a double pane window using a finite difference technique. The aim of the study is to determine the thermal optimum air layer thickness between the two panes for different climates. Four different cities of Turkey, representing different climate conditions are considered: Ankara, Antalya, Kars and Trabzon. Here, much more realistic boundary conditions considered for panes than those considered in Aydın (Energy and Buildings 2000; 32:303–8). Aydın (2000) assumed panes as isothermal surfaces, while, here, a conjugate heat transfer analysis is applied. Two different boundary conditions are applied for the outer surfaces facing inside and outside: constant temperature and convection. The height of the window, H is chosen 80 cm and the thickness of each pane is set 4 mm. The effect of air layer thickness varying between 3 and 40 mm on the average Nusselt number and the heat flux through the inner pane. It was shown that energy losses through the double pane windows can be considerably reduced by optimizing thickness of the air layer. It is also shown that filling the space between the glass panes with a gas having a lower thermal conductivity instead of air reduces the insulating value of the window. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Building and Environment Elsevier

Conjugate heat transfer analysis of double pane windows

Building and Environment, Volume 41 (2) – Feb 1, 2006

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Publisher
Elsevier
Copyright
Copyright © 2005 Elsevier Ltd
ISSN
0360-1323
DOI
10.1016/j.buildenv.2005.01.011
Publisher site
See Article on Publisher Site

Abstract

This study numerically analyzes conjugate heat transfer through a double pane window using a finite difference technique. The aim of the study is to determine the thermal optimum air layer thickness between the two panes for different climates. Four different cities of Turkey, representing different climate conditions are considered: Ankara, Antalya, Kars and Trabzon. Here, much more realistic boundary conditions considered for panes than those considered in Aydın (Energy and Buildings 2000; 32:303–8). Aydın (2000) assumed panes as isothermal surfaces, while, here, a conjugate heat transfer analysis is applied. Two different boundary conditions are applied for the outer surfaces facing inside and outside: constant temperature and convection. The height of the window, H is chosen 80 cm and the thickness of each pane is set 4 mm. The effect of air layer thickness varying between 3 and 40 mm on the average Nusselt number and the heat flux through the inner pane. It was shown that energy losses through the double pane windows can be considerably reduced by optimizing thickness of the air layer. It is also shown that filling the space between the glass panes with a gas having a lower thermal conductivity instead of air reduces the insulating value of the window.

Journal

Building and EnvironmentElsevier

Published: Feb 1, 2006

References

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