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Proceedings Paper

Temperature Patterns On Roof Systems With Ventilated Air Cavities
Author(s): M. D. Lyberg
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Paper Abstract

Damages on the insulation of roof systems has consequences for the performance of the roof system and the energy cost. An early detection of roof thermal anomalies may greatly reduce long-term maintenance costs. Airborne thermographic methods have for several years with success been applied to detect thermal anomalies of roof systems. For ventilated attics, the surface temperature pattern of the attic insulation can not always be inferred from a measurement of the surface temperature due to the influence of thermal properties of the roof system and to weather conditions. In this paper is presented a calculation of how the surface temperature pattern of the insulation influences the surface temperature pattern of a flat roof when part of the insulation is not functioning properly due to, for example, wettening of the material. The results are presented for various attic geometries, amount of convective heat transfer from the insulation to the attic air for different wind speeds, for various internal-external temperature differences, and for different emissivities of the roofing material.

Paper Details

Date Published: 21 March 1989
PDF: 8 pages
Proc. SPIE 1094, Thermosense XI: Intl Conf on Thermal Infrared Sensing for Diagnostics and Control, (21 March 1989); doi: 10.1117/12.953385
Show Author Affiliations
M. D. Lyberg, Swedish Institute for Building Research (Sweden)


Published in SPIE Proceedings Vol. 1094:
Thermosense XI: Intl Conf on Thermal Infrared Sensing for Diagnostics and Control
Gregory B. McIntosh, Editor(s)

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