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Proceedings Paper

Quantifying Heat Losses Using Aerial Thermography
Author(s): Gillian A. Haigh; Susan E. Pritchard
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Paper Abstract

A theoretical model is described for calculating flat roof total heat losses and thermal conductances from aerial infra-red data. Three empirical methods for estimating convective losses are described. The disagreement between the methods show that they are prone to large (20%) errors, and that the survey should be carried out in low wind speeds, in order to minimise the effect of these errors on the calculation of total heat loss. The errors associated with knowledge of ground truth data are discussed for a high emissivity roof and three sets of environmental conditions. It is shown that the error in the net radiative loss is strongly dependent on the error in measuring the broad-band radiation incident on the roof. This is minimised for clear skies, but should be measured. Accurate knowledge of roof emissivity and the radiation reflected from the roof is shown to be less important. Simple techniques are described for measuring all three factors. Using these techniques in good conditions it should be possible to measure total heat losses to within 15%.

Paper Details

Date Published: 27 January 1981
PDF: 13 pages
Proc. SPIE 0254, Thermal Infrared Sensing Applied to Energy Conservation in Building Envelopes: Thermosense III, (27 January 1981); doi: 10.1117/12.959534
Show Author Affiliations
Gillian A. Haigh, Atomic Energy Research Establishment (England)
Susan E. Pritchard, Atomic Energy Research Establishment (England)

Published in SPIE Proceedings Vol. 0254:
Thermal Infrared Sensing Applied to Energy Conservation in Building Envelopes: Thermosense III
Robert P. Madding, Editor(s)

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