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Proceedings Paper

Direct measurement of heat flux from cooling lake thermal imagery
Author(s): Alfred J. Garrett; Eliel Villa-Aleman; Robert J. Kurzeja; Malcolm M. Pendergast
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Paper Abstract

Laboratory experiments show a linear relationship between the total heat flux from a water surface to air and the standard deviation of the surface temperature field, σ, derived from thermal images of the water surface over a range of heat fluxes from 400 to 1800 Wm-2. Thermal imagery and surface data were collected at two power plant cooling lakes to determine if the laboratory relationship between heat flux and σ exists in large heated bodies of water. The heat fluxes computed from the cooling lake data range from 200 to 1400 Wm-2. The linear relationship between σ and Q is evident in the cooling lake data, but it is necessary to apply band pass filtering to the thermal imagery to remove camera artifacts and non-convective thermal gradients. The correlation between σ and Q is improved if a correction to the measured σ is made that accounts for wind speed effects on the thermal convection. Based on more than a thousand cooling lake images, the correlation coefficients between σ and Q ranged from about 0.8 to 0.9.

Paper Details

Date Published: 17 March 2008
PDF: 10 pages
Proc. SPIE 6939, Thermosense XXX, 69390T (17 March 2008);
Show Author Affiliations
Alfred J. Garrett, Savannah River National Lab. (United States)
Eliel Villa-Aleman, Savannah River National Lab. (United States)
Robert J. Kurzeja, Savannah River National Lab. (United States)
Malcolm M. Pendergast, Savannah River National Lab. (United States)

Published in SPIE Proceedings Vol. 6939:
Thermosense XXX
Vladimir P. Vavilov; Douglas D. Burleigh, Editor(s)

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