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Hot-Box measurements of highly insulated wall, roof and floor structures

Gullbrekken, Lars; Uvsløkk, Sivert; Kvande, Tore; Time, Berit
Journal article, Peer reviewed
Accepted version
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Hot‐Box measurements of highly insulated wall, roof and floor structures (695.6Kb)
URI
http://hdl.handle.net/11250/2468641
Date
2016
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Original version
Journal of Building Physics. 2016, 41 (1), 58-77.   10.1177/1744259116669516
Abstract
The purpose of this study was to investigate how natural convection in air permeable glass wool insulation affects the thermal transmittance in walls, roofs and floor structures. The results can be used to evaluate the need for a convection barrier in thick mineral wool layers. Natural convection is affected by several parameters. In this study, the angle of inclination, the heat flow direction and the temperature difference across the test section have been studied. Thermal transmittance and temperature distribution measured by use of thermocouples placed inside the insulation cavity clearly showed convection in the insulation when the test section was in pitched roof and wall positions. An efficient measure to reduce the natural convection is to divide the insulation layer into two thinner layers by using a diffusion open convection barrier. A convection barrier is recommended by the authors both in wall and pitched roof structures if the insulation thickness exceeds 200 mm.
Publisher
SAGE Publications
Journal
Journal of Building Physics
Copyright
© Preprint version the authors. This is the authors' accepted manuscript to the article. The final publication is available at https://doi.org/10.1177/1744259116669516

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