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Thermal Energy Storage for Parabolic Trough Power Plants with Direct Steam Generation

Laing, Doerte and Bauer, Thomas and Lehmann, Dorothea and Bahl, Carsten (2009) Thermal Energy Storage for Parabolic Trough Power Plants with Direct Steam Generation. In: Conference Proceedings (DVD-R). Energy Sustainability 2009, 19.-23. Juli 2009, San Francisco, USA. ISBN 978-0-7918-3851-8.

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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 tests of a PCM test module with approx. 140 kg NaNO3, applying the sandwich concept for enhancement of heat transfer, proved the expected capacity and power density. The concrete storage material for sensible heat was improved to allow the operation up to 500 °C for direct steam generation. A storage system with a total storage capacity of approx. 1 MWh is described, combining a PCM module and a concrete module, which will be tested in 2009 under real steam conditions around 100 bar.

Document Type:Conference or Workshop Item (Paper)
Title:Thermal Energy Storage for Parabolic Trough Power Plants with Direct Steam Generation
AuthorsInstitution or Email of Authors
Laing, Doertedoerte.laing@dlr.de
Bauer, Thomasthomas.bauer@dlr.de
Lehmann, Dorotheadorothea.lehmann@dlr.de
Bahl, Carstencarsten.bahl@zueblin.de
Date:July 2009
Journal or Publication Title:Conference Proceedings (DVD-R)
Refereed publication:No
In ISI Web of Science:No
Keywords:Thermal Energy Storage, Phase Change Material, Concrete, Parabolic Trough Power Plant, Direct Steam Generation, Storage System Design
Event Title:Energy Sustainability 2009
Event Location:San Francisco, USA
Event Type:international Conference
Event Dates:19.-23. Juli 2009
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E EV - Energy process technology (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Thermische Energiespeicher (old)
Location: Stuttgart
Institutes and Institutions:Institute of Technical Thermodynamics > Thermal Process Technology
Deposited By: Dörte Laing
Deposited On:17 Nov 2009 14:31
Last Modified:17 Nov 2009 14:31

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