Effect of framing factor on clear wall r-value for wood and steel framed walls
Syed, A.M., Kosny, J.
2006
Journal of Building Physics, Vol. 30, No. 2, 163-180
Syed, A.M., Kosny, J., (2006), "Effect of framing factor on clear wall r-value for wood and steel framed walls", Journal of Building Physics, Vol. 30, No. 2, 163-180.
| Abstract: |
| In the current practice of testing and theoretical analysis of building envelope assemblies, the amount of structural members incorporated into the total wall area is commonly called a framing factor. It used to be expressed as a percent of the total wall area. Traditionally, for wood-framed walls, the framing factor has been considered to be between 10 and 14%. According to the report prepared in 2002 by Enermodal Engineering for California Energy Commission, there is 27% framing in current residential walls in California. A similar study performed by the American Society of Heating Refrigeration and Air-conditioning Engineers in 2003 has concluded an average 25% of framing factor for all US residential buildings.
In order to incorporate this finding into theoretical and experimental procedures of heat transfer analysis, representative geometries for wood and steel-framed walls need to be redefined. In this article, R-values for various percentages of framing according to different methods of calculation are examined. Also, thermal effects of various configurations of installation, structural components in wood and steel-framed walls with studs installed at 16 in. on-center (for 27% of framing) are analyzed numerically using a 3D heat conduction code. In addition, consequences of installation imperfections in cavity insulation are analyzed from a thermal perspective. The performed numerical study demonstrated significant sensitivity of some residential walls for insulation installation imperfections. |
|
|
This publication in whole or part might be found online. Check the sources on the related article below. Or use search engines on the web.
|
Related Concepts
|
|