Determination of optimum air-layer thickness in double-pane windows

Aydin O.

ENERGY AND BUILDINGS, vol.32, no.3, pp.303-308, 2000 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 32 Issue: 3
  • Publication Date: 2000
  • Doi Number: 10.1016/s0378-7788(00)00057-8
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.303-308
  • Keywords: low-energy buildings, double-pane windows, optimum air-layer thickness, numerical simulation, NATURAL-CONVECTION, HEAT-TRANSFER, ENCLOSURES, CAVITY, SCREEN, ENERGY
  • Karadeniz Technical University Affiliated: No


In this study, heat transfer through a double-pane window is numerically analyzed by a finite difference technique. The aim of the study is to determine the thermally 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. The height of the window, H is chosen 80 cm. The effect of air-layer thickness varies 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 the thickness of air layer. (C) 2000 Published by Elsevier Science S.A.