Heat transfer coefficients for natural water surfaces

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Journal titleInternational Association of Scientific Hydrology
Pages203212; # of pages: 10
Subjectheat losses; solar radiation; surface temperature; convection; hydrography; autumn; rayonnement solaire; temperature superficielle; convection; hydrographie; automne
AbstractIt is shown in this paper that heat losses from open water surfaces will be approximately proportional to the difference in temperature between the water surface and the air, provided the energy gained by short-wave radiation equals that lost by evaporation. The heat transfer coefficient for a small, sheltered lake at Ottawa was measured during 4 autumn cooling periods and found to be 23. 4 cal/sq cm/24 hr/ degrees C. Calculated values from other studies for latitudes 40 to 60 degrees N indicate that the coefficient varies from 40 to 60 cal/sq cm/24 hr/degrees C for average exposure conditions. Lower values occur when short-wave radiation exceeds evaporation loss; the higher values during mid-winter conditions result when evaporation loss exceeds shot-waves radiation.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number7495
NPARC number20373771
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Record identifier2fc52408-00ea-4e3e-9f50-6a5034795fbc
Record created2012-07-23
Record modified2016-05-09
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