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TECHNICAL PAPERS

Advanced Thermal Energy Storage Technology for Parabolic Trough

[+] Author and Article Information
Rainer Tamme, Doerte Laing, Wolf-Dieter Steinmann

DLR–German Aerospace Center, Institute of Technical Thermodynamics, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany

J. Sol. Energy Eng 126(2), 794-800 (May 04, 2004) (7 pages) doi:10.1115/1.1687404 History: Received July 01, 2003; Revised December 01, 2003; Online May 04, 2004
Copyright © 2004 by ASME
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References

Winter, C.-J., Sizmann, R. L., and Vant-Hull, L. L., 1991, Solar Power Plants, Springer-Verlag.
Dinter, F., Geyer, M., and Tamme, R., 1990, “Thermal Energy Storage for Commercial Applications,” Springer-Verlag.
Tamme, R., Laing, D., Steinmann, W. D., and Zunft, S., 2002, “Innovative Thermal Energy Storage Technology for Parabolic Trough Concentrating Solar Power Plants,” Proceedings EuroSun 2002, The 4th ISES Europe Solar Congress, Bologna, Italy.
Modelica Language Specification www.modelica.org.
Tiller, M. M., 2001, “Introduction to Physical Modeling with Modelica,” Kluwer Academic Publishers.
Eck,  M., and Steinmann,  W.-D., 2002, “Direct Steam Generation in Parabolic Troughs: First Results of the Diss Project,” ASME J. Sol. Energy Eng., 124, pp. 134–139.

Figures

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Basic concept for integration of thermal energy storage into solar thermal parabolic trough power plants
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Integration of test storage units into parabolic trough test loop at PSA
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Physical model for the storage unit and parameters describing the geometry
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Part of the Modelica-model representing a single tube and the surrounding storage material. The tube and the storage material are discretized in axial direction, the storage material is also discretized in radial direction
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Influence of thermal conductivity of storage material on storage temperature at distance da/2 from tube
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Thermal power transferred to differential storage element during charging with varying thermal conductivity of storage material
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Influence of volumetric heat capacity on storage temperature at distance da/2 from tube
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Influence of volumetric heat capacity on thermal power transferred to storage medium during charging period
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Influence of diameter of flow channel on storage temperature at distance da/2 from tube
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Thermal power transferred to storage system for various diameters of flow channel
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Influence of distance between flow channels on storage temperature at distance da/2 from tube
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Thermal power transferred during charging period to storage material for different values for distance between flow channels
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Temperature in storage material at different distances Δr from flow channel. Distance between axis of flow channels is 0.16 m
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Temperature distribution in the storage versus length for beginning and end of charging and discharging, respectively
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Power cycle for basic concept in T-s diagram during discharge
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Distribution of thermal energy transferred to feed water of Rankine cycle of parabolic trough power plant
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Configuration solar field: basic concept (left) and modular charging concept (right); exemplary values to show effect on allowable storage outlet temperature
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Modular discharge concept; re-heating at two different temperature levels
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Calculated values for electric power provided by power plant during discharge for different charging and discharging strategies; identical storage geometry
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Results for electric energy provided by power plant during discharge of storage for different charging and discharging strategies; identical storage geometry

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