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Research Papers

Test Results of Concrete Thermal Energy Storage for Parabolic Trough Power Plants

[+] Author and Article Information
Doerte Laing

Institute of Technical Thermodynamics, DLR-German Aerospace Center, Pfaffenwaldring 38-40, 70569 Stuttgart, Germanydoerte.laing@dlr.de

Dorothea Lehmann, Michael Fiß

Institute of Technical Thermodynamics, DLR-German Aerospace Center, Pfaffenwaldring 38-40, 70569 Stuttgart, Germany

Carsten Bahl

Technical Department, Ed. Züblin AG, Albstadtweg 3, 70567 Stuttgart, Germany

J. Sol. Energy Eng 131(4), 041007 (Sep 18, 2009) (6 pages) doi:10.1115/1.3197844 History: Received December 12, 2008; Revised June 04, 2009; Published September 18, 2009

Efficient energy storage is vital to the success of solar thermal power generation and industrial waste heat recovery. A sensible heat storage system using concrete as the storage material has been developed by the German building company Ed. Züblin AG and the German Aerospace Center (DLR). A major focus was the cost reduction in the heat exchanger and the high temperature concrete storage material. For live tests and further improvements, a 20m3 solid media storage test module connected to an electrically heated thermal oil loop was built in Stuttgart. The design of the test module and the test results are described in this paper. By the end of November 2008, the second generation solid media storage test module had accumulated five months of operation in the temperature range between 300°C and 400°C and almost 100 thermal cycles with a temperature difference of 40 K. The tests will be continued in 2009.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Principle of thermal storage in concrete: charging mode

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Figure 2

Storage module with visible tube register

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Figure 3

Lifting of the prefabricated tube register

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Figure 4

Concrete testing: probes for thermal cycling (left) and strength test (right)

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Figure 5

Finished test module (without thermal insulation)

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Figure 6

Top view: arrangement of the temperature measurement cross sections (lines) and vapor pressure sensors (squares)

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Figure 7

Initial heating-up period from April 21–28 2008 with expulsion of water from the concrete—temperature of the thermal oil at the inlet/outlet (Pt100 MQ1/Pt100 MQ4) and of concrete in the core of the storage module (MQ1–6 6 4, MQ4–6 6 4) on the left axis and vapor pressure on the right axis

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Figure 8

Accelerated cycling program of test module

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Figure 9

Comparison of power measured in reference steady state cycles (24 h charging from a storage temperature of 350°C to a storage temperature of 390°C)

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Figure 10

Comparison of simulation and experiment for a charging cycle

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Figure 11

Basic storage module

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Figure 12

Set-up of a 1100 MW h concrete storage from 252 basic storage modules

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