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Design and Performance Evaluation of Advanced Window Systems

[+] Author Affiliations
Amy Butterfield, Richard D. Wilk

Union College

Paper No. IMECE2005-81363, pp. 541-546; 6 pages
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Part A
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-4221-5 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME


This paper presents the results of a study to compare the heat transfer characteristics of silica aerogels to that of air. A small window unit was made with a section having monolithic silica aerogels sandwiched between two plates of window glass. Another section had just an air space in between. Upon constant heating, steady state temperature measurements were made across the window unit. These data were used to infer apparent thermal resistance values for each case. The measured results showed that the aerogel insulation had a thermal resistance approximately 20% greater than that of air alone. A numerical heat transfer model of the system was developed in Cosmosworks. The model was used to match the experimental results and determine calculated thermal conductivity values for each of the interface cases: silica aerogel and air. The calculated thermal conductivity value of the aerogel matched well with typical values for this material. The calculated value for air though was approximately four times higher than the published value. This difference was attributed to the occurrence of free convection in the air space which was not accounted for in the model.

Copyright © 2005 by ASME



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