The knowledge of the absorber surface temperature distribution is essential for efficient operation and further development of solar thermal high temperature receivers. However, the concentrated solar radiation makes it difficult to determine the temperature on irradiated surfaces. Contact thermometry is not appropriate and pyrometric measurements are distorted by the reflected solar radiation. The measurement in solar-blind spectral ranges offers a possible solution by eliminating the reflected solar radiation from the measurement signal. The paper shows that besides the incoming solar radiation and the absorber emittance, the bi-directional reflection properties and the temperature of the object are determining for the required selectivity of the spectral filter. Atmospheric absorption affects the solar blind pyrometric measurements in absorption bands of CO2 and water vapor. The deviation of temperature measurement due to atmospheric absorption is quantified and the possibilities and limitations of accounting for the atmospheric absorption with models based on radiation transfer calculations are discussed.
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ASME 2005 International Solar Energy Conference
August 6–12, 2005
Orlando, Florida, USA
Conference Sponsors:
- Solar Energy Division
ISBN:
0-7918-4737-3
PROCEEDINGS PAPER
Pyrometric Temperature Measurements on Solar Thermal Receivers
Markus Pfa¨nder,
Markus Pfa¨nder
DLR – German Aerospace Center, Almeri´a, Spain
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Peter Heller,
Peter Heller
DLR – German Aerospace Center, Almeri´a, Spain
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Eckhard Lu¨pfert
Eckhard Lu¨pfert
DLR – German Aerospace Center, Almeri´a, Spain
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Markus Pfa¨nder
DLR – German Aerospace Center, Almeri´a, Spain
Peter Heller
DLR – German Aerospace Center, Almeri´a, Spain
Eckhard Lu¨pfert
DLR – German Aerospace Center, Almeri´a, Spain
Paper No:
ISEC2005-76183, pp. 833-841; 9 pages
Published Online:
October 15, 2008
Citation
Pfa¨nder, M, Heller, P, & Lu¨pfert, E. "Pyrometric Temperature Measurements on Solar Thermal Receivers." Proceedings of the ASME 2005 International Solar Energy Conference. Solar Energy. Orlando, Florida, USA. August 6–12, 2005. pp. 833-841. ASME. https://doi.org/10.1115/ISEC2005-76183
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