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TECHNICAL PAPERS

Tremper–A Versatile Tool for High-Temperature Chemical Reactivity Studies under Concentrated Solar Radiation

[+] Author and Article Information
Th. Frey, E. Steiner, D. Wuillemin, M. Sturzenegger

Laboratory for High-Temperature Solar Technology, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

J. Sol. Energy Eng 123(2), 147-152 (Dec 01, 2000) (6 pages) doi:10.1115/1.1351810 History: Received July 01, 2000; Revised December 01, 2000
Copyright © 2001 by ASME
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References

Figures

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Schematic drawing of the quench unit. For an explanation of the variables see text.
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Experimental setup: FAMP with flash and the two lenses (left), TREMPER (right) and the reference target to measure the flux density (rightmost)
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View of the parabolic concentrator from the sample’s visual focus: 1 upper blocked area, 6%; 2 area seen via the main part of the 45° mirror, 64%; 3 area seen via the quench part (hammer) of the 45° mirror, 25%; 4 lower blocked area, 5%
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Contour plot with flux densities measured in the sample plane (focal plane). Grayish circle in the center represents the sample.
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Temperatures measured simultaneously with FAMP (circles) and the solar-blind pyrometer (solid line) during the reduction of Fe3O4 under nitrogen. Shutter opening and closing time was 1 s, no quenching was applied. Dashed line: effective irradiance.
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Comparison between calculated stagnation temperatures (curves) and temperatures of different samples measured under various flux densities (dots). Details see text.
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Temperature traces for heating and non-forced cooling recorded with the solar-blind pyrometer and calculated temperature curves. Experimental data refer to two nominally identical experiments with Fe2O3 as starting material. Dashed line: solar input.
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Calculated temperature curve for a quenched sample
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MnO content of MnO2 samples reduced under nitrogen (• quenched, ○ not quenched) and under air (▴ quenched, ▵ not quenched) as a function of irradiation time. Results were derived from thermogravimetric reductions in hydrogen.
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Mass spectrometer signals for oxygen (m/z=32) during the reduction of Fe3O4 under nitrogen. The curves result from two experiments with different irradiation times. Dashed lines: effective irradiance.

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