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17 March 2008 Direct measurement of heat flux from cooling lake thermal imagery
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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.
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Alfred J. Garrett, Eliel Villa-Aleman, Robert J. Kurzeja, and Malcolm M. Pendergast "Direct measurement of heat flux from cooling lake thermal imagery", Proc. SPIE 6939, Thermosense XXX, 69390T (17 March 2008); https://doi.org/10.1117/12.768102
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