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Research Papers

Latent Heat Storage for Solar Steam Systems

[+] Author and Article Information
Wolf-Dieter Steinmann

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

Rainer Tamme

German Aerospace Center (DLR), Institute of Technical Thermodynamics, Pfaffenwaldring 38-40, 70569 Stuttgart, Germanywolf.steinamm@dlr.de

J. Sol. Energy Eng 130(1), 011004 (Dec 28, 2007) (5 pages) doi:10.1115/1.2804624 History: Received October 04, 2006; Revised May 08, 2007; Published December 28, 2007

Solar thermal systems, including direct steam generation in the absorbers, require isothermal energy storage systems. One option to fulfil this requirement is the application of phase change materials (PCMs) to absorb or release energy. The implementation of cost-effective storage systems demands the compensation of the low thermal heat conductivity that is characteristic for the candidate materials for PCM. Solar steam generation for power plants requires latent heat storage systems for a saturation temperature range between 200°C and 320°C. This paper describes the basic concepts investigated and first results of research activities aiming at the demonstration of a storage system using steam provided by parabolic trough collectors.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Integration of energy storage in a simplified parabolic trough power plant with direct steam generation

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Figure 2

t-s diagram for charging and discharging processes for steam in the power plant according to Fig. 1

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Figure 3

Effect of thermal heat conductivity on the number of required tubes in a PCM system with an integrated parallel tube heat exchanger, calculated for three different levels of average volume specific thermal power during charging/discharging

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Figure 4

Classification of PCM-storage concepts investigated in the DISTOR project

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Figure 5

Schematic of the sandwich concept using graphite foil

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Figure 6

Single module for the sandwich concept for a single central steam pipe

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Figure 7

Heat exchanger of the sandwich-design concept before integration into a container with PCM

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Figure 8

Pressure inside a capsule filled with PCM depending on temperature for three different values of initial gas volume

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Figure 9

Capsules filled with NaNO3–KNO3 used for laboratory-scale test.

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Figure 10

Effective thermal heat conductivity of PCM/graphite composite dependent on temperature for various compositions

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Figure 11

Single segment made of PCM/composite material used for the laboratory-scale storage test unit. Holes are intended for steam pipes. Segment manufactured by SGL Technologies.

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