For future parabolic trough plants direct steam generation in the absorber pipes is a promising option for reducing the costs of solar thermal power generation. These new solar thermal power plants require innovative storage concepts, where the two-phase heat transfer fluid poses a major challenge. A three-part storage system is proposed where a phase change material (PCM) storage will be deployed for the two-phase evaporation, while concrete storage will be used for storing sensible heat, i.e., for preheating of water and superheating of steam. A pinch analysis helps to recognize interface constraints imposed by the solar field and the power block and describes a way to dimension the latent and sensible components. Laboratory test results of a PCM test module with , applying the sandwich concept for enhancement of heat transfer, are presented, proving the expected capacity and power density. The concrete storage material for sensible heat was improved to allow the operation up to for direct steam generation. A storage system with a total storage capacity of is described, combining a PCM module and a concrete module, which will be tested in 2009 under real steam conditions around 100 bars.
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Development of a Thermal Energy Storage System for Parabolic Trough Power Plants With Direct Steam Generation
Doerte Laing,
Doerte Laing
German Aerospace Center (DLR ),
e-mail: doerte.laing@dlr.de
Institute of Technical Thermodynamics
, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
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Thomas Bauer,
Thomas Bauer
German Aerospace Center (DLR ),
Institute of Technical Thermodynamics
, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
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Dorothea Lehmann,
Dorothea Lehmann
German Aerospace Center (DLR ),
Institute of Technical Thermodynamics
, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
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Carsten Bahl
Carsten Bahl
Technical Department,
Ed. Züblin AG
, Albstadtweg 3, 70567 Stuttgart, Germany
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Doerte Laing
German Aerospace Center (DLR ),
Institute of Technical Thermodynamics
, Pfaffenwaldring 38-40, 70569 Stuttgart, Germanye-mail: doerte.laing@dlr.de
Thomas Bauer
German Aerospace Center (DLR ),
Institute of Technical Thermodynamics
, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
Dorothea Lehmann
German Aerospace Center (DLR ),
Institute of Technical Thermodynamics
, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany
Carsten Bahl
Technical Department,
Ed. Züblin AG
, Albstadtweg 3, 70567 Stuttgart, GermanyJ. Sol. Energy Eng. May 2010, 132(2): 021011 (8 pages)
Published Online: May 10, 2010
Article history
Received:
September 29, 2009
Revised:
March 18, 2010
Online:
May 10, 2010
Published:
May 10, 2010
Citation
Laing, D., Bauer, T., Lehmann, D., and Bahl, C. (May 10, 2010). "Development of a Thermal Energy Storage System for Parabolic Trough Power Plants With Direct Steam Generation." ASME. J. Sol. Energy Eng. May 2010; 132(2): 021011. https://doi.org/10.1115/1.4001472
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