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TECHNICAL PAPERS

Development of a Molten-Salt Thermocline Thermal Storage System for Parabolic Trough Plants

[+] Author and Article Information
James E. Pacheco, Steven K. Showalter, William J. Kolb

Sandia National Laboratories,1 Solar Thermal Technology Department, Albuquerque, NM 87185-0703

J. Sol. Energy Eng 124(2), 153-159 (Apr 24, 2002) (7 pages) doi:10.1115/1.1464123 History: Received November 01, 2000; Revised May 01, 2001; Online April 24, 2002
Copyright © 2002 by ASME
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References

Figures

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Schematic of a two-tank thermal storage system integrated into a trough plant
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Temperature gradient every 0.5 h during a charging cycle of a 688 MWht thermocline tank 16 m tall and 34.3 m diameter filled with quartzite and sand
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Salt temperature going into (upper line) and coming out (lower line) of a 688 MWht thermocline tank during a charge cycle (same tank as in Fig. 2)
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Salt temperature coming out of (upper curve) and going into (lower curve) a 688 MWht thermocline tank during a discharge cycle (same tank as in Fig. 2)
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Schematic and photograph of thermal cycling system to test selected candidate materials
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Schematic of the 2.3 MWh thermocline flow loop
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Measured temperatures of salt pumped from the bottom and returned to the top of the thermocline tank during a charging cycle
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Measured temperatures of the thermocline profiles during a discharge cycle
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Degradation of the thermocline profile over a period of 41 hours without supplementary heat

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