Abstract
A new concept for long-term solar storage is based on the absorption properties of aqueous calcium chloride. Water, diluted and concentrated calcium chloride solutions are stored in a single tank. An immersed heat exchanger and stratification manifold are used to preserve long-term sorption storage, and to achieve thermal stratification. The feasibility of the concept is demonstrated via measurements of velocity, CaCl2 mass fraction, and temperature in a 1500 liter prototype tank during sensible charging. Experiments are conducted over a practical range of the relevant dimensionless parameters. For Rayleigh numbers from 3.4×108 to 5.6×1010 and buoyancy ratios from 0.8 to 46.2, measured Sherwood numbers are 11±2 to 62±9 and the tank is thermally stratified. Convective mixing is inhibited by the presence of a steep density gradient at the interface between regions of differing mass fraction. The predicted storage time scales for the reported Sherwood numbers are 160 to 902 days.
Original language | English (US) |
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Pages | 89-95 |
Number of pages | 7 |
DOIs | |
State | Published - Jan 1 2012 |
Event | ASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology - San Diego, CA, United States Duration: Jul 23 2012 → Jul 26 2012 |
Other
Other | ASME 2012 6th International Conference on Energy Sustainability, ES 2012, Collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology |
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Country/Territory | United States |
City | San Diego, CA |
Period | 7/23/12 → 7/26/12 |