Journal
SOLAR ENERGY
Volume 99, Issue -, Pages 36-46Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2013.10.035
Keywords
Salt-gradient solar pond; Solar energy; Evaporation suppression; Transparent pond covers; Distributed temperature sensing
Categories
Funding
- U.S. Department of Energy (DOE) (Nevada Renewable Energy Consortium) [656-1769-01-NV-REC]
- National Science Foundation (NSF) [NSF-EAR-0929638, NSF-EAR-1128999]
- Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT), Chile [11121208]
- Directorate For Geosciences
- Division Of Earth Sciences [1129003] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [1128999] Funding Source: National Science Foundation
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Evaporation represents a significant challenge to the successful operation of solar ponds. In this work, the suppression of evaporative losses from a salt-gradient solar pond was investigated in the laboratory. Two floating element designs (floating discs and floating hemispheres) and a continuous cover were tested; all three covers/elements were non-opaque, which is unique from previous studies of evaporation suppression in ponds or pools where increasing temperature and heat content are not desired. It was found that floating discs were the most effective element; full (88%) coverage of the solar pond with the floating discs decreases the evaporation rate from 4.8 to 2.5 mm/day (47% decrease), increases the highest achieved temperature from 34 degrees C to 43 degrees C (26% increase), and increases heat content from 179 to 220 MJ (22% increase). As a result of reduced evaporative losses at the surface, the amount of heat lost to the atmosphere is also reduced, which results in lower conductive losses from the NCZ and the LCZ and hence, increased temperatures in the NCZ and LCZ. The magnitude of evaporation reduction observed in this work is important as it may enable solar pond operation in locations with limited water supply for replenishment. The increase in heat content allows more heat to be withdrawn from the pond for use in external applications, which significantly improves the thermal efficiencies of solar ponds. (C) 2013 Elsevier Ltd. All rights reserved.
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