Research Papers

Air-Sand Heat Exchanger for High-Temperature Storage

[+] Author and Article Information
Shashikant Warerkar, Stefan Schmitz, Joachim Goettsche, Bernhard Hoffschmidt, Martin Reißel

 Solar-Institut Jülich/FH Aachen, Heinrich-Mußmann-Str. 5, Jülich D-52428, Germany

Rainer Tamme

 German Aerospace Center (DLR), Pfaffenwaldring 38-40, Stuttgart D-70569, Germanyrainer.tamme@dlr.de

Source: Co.Quarzwerke: Frechen, Germany 01/03/2010.

J. Sol. Energy Eng 133(2), 021010 (Apr 07, 2011) (7 pages) doi:10.1115/1.4003583 History: Received December 03, 2009; Revised October 25, 2010; Published April 07, 2011; Online April 07, 2011

In view of rising energy prices and an increasing share of power generated by renewable energy sources, the importance of energy storage is growing. In the framework of this project, a thermal energy storage concept for solar power towers is being developed, in which quartz sand serves as a storage medium. Sand is suitable due to its properties such as high thermal stability, specific heat capacity, and low-cost availability. Compared with storages based on ceramic bodies, the use of sand promises to reduce costs of energy storage and thus to reduce the costs of electricity generation. In addition, the storage concept could be applicable in the steel industry. The central element of the storage concept is an air-sand heat exchanger, which is presently under development. This paper describes simulation results and measurements of the heat exchanger prototype. It includes sand flow behavior and experience with different porous walls as well as up-scaling options.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Schematic diagram of the Jülich solar power tower with thermal storage system

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Figure 2

Sand storage concept for solar power towers

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Figure 3

Steady state air temperature and air flow field simulation

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Figure 4

Experimental air-sand heat exchanger unit

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Figure 5

Channeled and solid RSiC filtration walls, porosity: 25–45%

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Figure 6

Blocking of sand flow, starting from the air outflow side (left side): (a) 1.2 m/s and [(b) and (c)] 1.9 m/s

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Figure 7

Critical air velocity versus sand grain size and mass flow rate

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Figure 8

Temperature dependence of quartz sand specific heat

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Figure 9

Front view of air outflow area showing horizontally inhomogeneous temperature distribution

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Figure 10

Measured pressure drop data of filtering walls and sand

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Figure 11

Up-scaled version of the heat exchanger

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Figure 12

Modified storage concept for coarse sand/grit



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