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Research Papers

Detailed Performance Analysis of a 10kW Dish∕Stirling System

[+] Author and Article Information
W. Reinalter

German Aerospace Center (DLR),  Institute of Technical Thermodynamics, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany;  Plataforma Solar de Almería (PSA), 04200 Tabernas, Spainwolfgang.reinalter@dlr.de

S. Ulmer, P. Heller, T. Rauch

German Aerospace Center (DLR),  Institute of Technical Thermodynamics, Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany;  Plataforma Solar de Almería (PSA), 04200 Tabernas, Spain

J.-M. Gineste, A. Ferriere, F. Nepveu

 PROMES-CNRS Laboratory, 7 rue du Four Solaire, 66120 Font-Romeu, France

J. Sol. Energy Eng 130(1), 011013 (Dec 28, 2007) (6 pages) doi:10.1115/1.2807191 History: Received September 21, 2006; Revised September 10, 2007; Published December 28, 2007

The CNRS-Promes dish∕Stirling system was erected in Jun. 2004 as the last of three country reference units built in the “Envirodish” project. It represents the latest development step of the EuroDish system with many improved components. With a measured peak of 11kW electrical output power, it is also the best performing system so far. The measurement campaign to determine the optical and thermodynamic efficiency of the system is presented. The optical quality of the concentrator and the energy input to the power conversion unit was measured with a classical flux-mapping system using a Lambertian target and a charge coupled device camera system. An efficiency of the concentrator including the intercept losses of 74.4% could be defined for this particular system. For the thermodynamic analysis all the data necessary for a complete energy balance around the Stirling engine were measured or approximated by calculations. For the given ambient conditions during the tests, a Stirling engine efficiency of 39.4% could be measured. The overall efficiency for the conversion of solar to electric energy was 22.5%.

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References

Figures

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Figure 1

The CNRS EuroDish System

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Figure 2

Energy flow in a dish∕Stirling system

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Figure 3

Normalized flux distribution in the focal plane

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Figure 4

Normalized flux distribution in the absorber plane

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Figure 5

Peak flux and aperture intercept variation close to the focal plane of the EuroDish

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Figure 6

Intercept radii within the EuroDish cavity

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