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Properties of bulk materials for high-temperature air-sand heat exchangers

Baumann, Torsten and Boura, Cristiano and Eckstein, Julian and Dabrowski, Jan and Göttsche, Joachim and Hoffschmidt, Bernhard and Schmitz, Stefan and Zunft, Stefan (2011) Properties of bulk materials for high-temperature air-sand heat exchangers. In: Proceedings ISES 2011. ISES 2011, 29. Aug.-01.Sept. 2011, Kassel, Germany.

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Dispatchability of CSP 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 fine-grained particles as its storage material is a technology option that offers novel low-cost solutions. The implementation of this concept however depends on a viable concept for an air-to-particle heat exchanger, a component that is needed to heat up the particle flow and that is not available on the market today. Solar- Institut Jülich (SIJ) and the German Aerospace Centre (DLR) are developing and testing a new air-to-particle heat exchanger (Warerkar et al., 2009). Relevant problems include high temperature gradients in sand and frame structure, the pressure drop through the heat exchanger, the thermodynamic behavior and the fluid dynamic interaction within the bulk material. In this paper open questions on material properties of the sand-like inventory are addressed. High requirements are placed on the particulate materials used in sand-air heat-exchanger to ensure a smooth and efficient operation for many years. Hence, a detailed analysis of candidate bulk materials and their properties are of ample importance for the development of the technology. The focus of this work is put on properties like effective thermal bulk conductivity, thermal shock resistance, and attrition aspects.

Item URL in elib:https://elib.dlr.de/71474/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Properties of bulk materials for high-temperature air-sand heat exchangers
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Baumann, Torstentorsten.baumann (at) dlr.deUNSPECIFIED
Hoffschmidt, BernhardSIJUNSPECIFIED
Zunft, Stefanstefan.zunft (at) dlr.deUNSPECIFIED
Journal or Publication Title:Proceedings ISES 2011
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:air-sand heat exchanger, CSP, granular materials, thermal bulk conductivity, pressure drop, attrition, thermal shock
Event Title:ISES 2011
Event Location:Kassel, Germany
Event Type:international Conference
Event Dates: 29. Aug.-01.Sept. 2011
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 - Thermochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Baumann, Dr.Ing. Torsten
Deposited On:21 Nov 2011 15:39
Last Modified:01 Feb 2012 10:11

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