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Properties of Granular Materials as Heat Transfer and Storage Medium for CSP Plants with Thermal Energy Storage and Moving Bed Heat Exchanger

Baumann, Torsten and Roßkopf, Christian and Zunft, Stefan (2013) Properties of Granular Materials as Heat Transfer and Storage Medium for CSP Plants with Thermal Energy Storage and Moving Bed Heat Exchanger. EUROMAT, Sevilla, Spanien.

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Abstract

The dispatchability of Concentrating Solar Power (CSP) plants and a further reduction of levelized electricity costs are strong incentives for the development of cost-efficient technical solutions for thermal storage systems. A heat storage system using movable fine-grained particles as storage material is a technology option that offers novel low-cost solutions. To deploy such a storage concept, the application of a Moving Bed Heat Exchanger is likely the most efficient way to recover the stored heat from the particles and to run a Rankine steam cycle. The granular inventory has to meet solar-specific requirements. Also, the materials’ properties and their long-term behavior provide important information on the optimal design and operation of the storage/heat-exchanger system. To that end, granular natural and ceramic materials have been experimentally characterized with regard to their application as sensible heat transfer and storage media in a dynamic high temperature operation. Those materials potentially offer high heat capacities and high operation temperatures. Thermo-physical, thermo-mechanical, tribological and rheological measurements have been conducted. Thermal bulk conductivity is found to be only marginally affected by the solid’s conductivity. Specific heat is almost the same for all solids. Ceramics entirely withstand thermal cycling, while quartz sand is prone to severe degradation. Most materials are found to attain a saturated state of attrition when they are sheared under mechanical load, where quartz sand offers the lowest mass fraction of debris at saturation level. In the grain size range regarded here, all materials show an excellent flowability. Nevertheless, the presence of debris affects the flowability and thus requires consideration in the design of the device. Concluding, ceramic materials are found to have advantages, but natural products offer a considerably more economical solution.

Item URL in elib:https://elib.dlr.de/86287/
Document Type:Conference or Workshop Item (Poster)
Title:Properties of Granular Materials as Heat Transfer and Storage Medium for CSP Plants with Thermal Energy Storage and Moving Bed Heat Exchanger
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Baumann, Torstentorsten.baumann (at) dlr.deUNSPECIFIED
Roßkopf, Christianchristian.rosskopf (at) dlr.deUNSPECIFIED
Zunft, Stefanstefan.zunft (at) dlr.deUNSPECIFIED
Date:September 2013
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:granular materials, moving bed, heat exchanger, thermophysical, attrition, rheology
Event Title:EUROMAT
Event Location:Sevilla, Spanien
Event Type:international Conference
Organizer:Federation of European Materials Societies
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Energy-efficient Processes (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Thermochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Baumann, Dr.Ing. Torsten
Deposited On:09 Dec 2013 14:27
Last Modified:09 Dec 2013 14:27

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