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Research Papers

Solid Media Thermal Storage Development and Analysis of Modular Storage Operation Concepts for Parabolic Trough Power Plants

[+] Author and Article Information
Doerte Laing

DLR-German Aerospace Center, Institute of Technical Thermodynamics, Pfaffenwaldring 38-40, 70569 Stuttgart, Germanydoerte.laing@dlr.de

Wolf-Dieter Steinmann, Michael Fiß, Rainer Tamme

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

Thomas Brand, Carsten Bahl

 Technical Department, Ed. Züblin AG, Sachsendamm 4-5, 10829 Berlin, Germany

Project PARASOL/WESPE (“midterm storage concepts—further development of solid media sensible heat storage systems”), funded by the German “Bundesministerium für Umwelt, Naturschutz und Reaktorsicherheit” (BMU).

WANDA (“precommercial development of the WESPE storage-technology for use in ANDASOL-type power plants”).

J. Sol. Energy Eng 130(1), 011006 (Dec 28, 2007) (5 pages) doi:10.1115/1.2804625 History: Received September 28, 2006; Revised July 06, 2007; Published December 28, 2007

Cost-effective integrated storage systems are important components for the accelerated market penetration of solarthermal power plants. Besides extended utilization of the power block, the main benefits of storage systems are improved efficiency of components, and facilitated integration into the electrical grids. For parabolic trough power plants using synthetic oil as the heat transfer medium, the application of solid media sensible heat storage is an attractive option in terms of investment and maintenance costs. For commercial oil trough technology, a solid media sensible heat storage system was developed and tested. One focus of the project was the cost reduction of the heat exchanger; the second focus lies in the energetic and exergetic analysis of modular storage operation concepts, including a cost assessment of these concepts. The results show that technically there are various interesting ways to improve storage performance. However, these efforts do not improve the economical aspect. Therefore, the tube register with straight parallel tubes without additional structures to enhance heat transfer has been identified as the best option concerning manufacturing aspects and investment costs. The results of the energetic and exergetic analysis of modular storage integration and operation concepts show a significant potential for economic optimization. An increase of more than 100% in storage capacity or a reduction of more than a factor of 2 in storage size and therefore investment cost for the storage system was calculated. A complete economical analysis, including the additional costs for this concept on the solar field piping and control, still has to be performed.

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Figures

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Figure 1

Specific heat capacity as a function of total tube length for different thermal conductivities (W/mK) and distance of tubes (cm)

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Figure 3

Orthogonal reinforcement grids

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Figure 4

FEM analysis of tube register without and with fins

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Figure 5

Scheme of reference concept for solarthermal power plant with integrated storage system

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Figure 6

Comparison reference concept (left) with modular concept for charging (right)

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Figure 7

Modular concept for discharging

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Figure 8

Calculated electric work provided during storage operation of a 50MW power plant for various configurations of the storage unit

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