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Research Papers

Jülich Solar Power Tower—Experimental Evaluation of the Storage Subsystem and Performance Calculation

[+] Author and Article Information
Stefan Zunft, Matthias Hänel, Michael Krüger, Volker Dreißigacker, Felix Göhring, Eberhard Wahl

Dr.-Ing., Research area manager, German Aerospace Center (DLR),  Institute of Technical Thermodynamics, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany e-mail: Stefan.Zunft@dlr.deDipl.-Ing. (FH),  Technical Manager Air Purification Systems, KBA-CleanAir, Stuttgart, GermanyDipl.-Ing., Researcher, German Aerospace Center (DLR),  Institute of Technical Thermodynamics, Stuttgart, GermanyDipl.-Ing., Researcher, German Aerospace Center (DLR),  Institute of Technical Thermodynamics, Cologne, Germany Dipl.-Ing., Project Manager R&D, KBA-CleanAir, Stuttgart, Germany

J. Sol. Energy Eng 133(3), 031019 (Jul 28, 2011) (5 pages) doi:10.1115/1.4004358 History: Received January 28, 2011; Revised May 10, 2011; Published July 28, 2011; Online July 28, 2011

Storage technology based on solid media heated in direct contact—so-called regenerators—is well suited to promote the market introduction of solar central receiver plants with air receivers. However, starting from existing technologies, several design issues need to be addressed. A test campaign was performed at the Solar Power Tower Jülich, an experimental central receiver plant, to experimentally verify the functionality and to quantify the performance of the plant’s storage subsystem. To this end, a gas burner used during commissioning of the plant, was reactivated and used to run a series of operation sequences. Computer simulations have been set up and applied to retrace the storage behavior to confirm the validity of the underlying models and to gain further insight into the relevant phenomena. The test results confirm the full functionality of the storage subsystem, the ability to perform cycling at high discharge heat rates and relatively low heat losses, supporting the view that the technology represents a promising basis for up-scaled implementations. Measurement data and simulation results are in good agreement, confirming the maturity of existing design tools.

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Copyright © 2011 by American Society of Mechanical Engineers
Topics: Storage , Design , Heat , Temperature
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Figures

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Figure 1

Jülich solar central receiver plant (left) and plant layout (right)

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Figure 2

Storage subsystem

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Figure 3

Storage standstill of fully charged storage: Inventory temperature profiles at consecutive points of time. Measured data recorded on 16th and 17th March 2010, given as cross-sectional mean values (dotted lines), simulation results (straight lines) (left). Infrared image of the lateral storage surface during standstill (right).

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Figure 4

Cyclic storage operation: Charge/discharge cycles for the operation of two storage chambers at full load. Measured data recorded on 22nd and 23rd March 2010 (straight lines), simulation results (dotted lines). From top to bottom: fluid temperature, solid temperature, storage mass flow, pressure loss over inventory, heat rate from/to storage.

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