Characterization of High Temperature Solar Thermal Selective Absorber Coatings at Operation Temperature

Bartelmess, Lothar; Monte, C.; Adibekyan, Albert; Sohr, O.; Ottermann, C.; Korb, T.; Hollandt, J.

doi:10.1016/j.egypro.2014.03.219

Cited by 10 publications

(10 citation statements)

References 4 publications

(4 reference statements)

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“…(8), the absorber tube temperature T ro is in o C. The emissivity values given by Eq. (8) correspond to the values of emissivity of tubular metal sample with coating type 1 in a recent study by (Bartelmeß et al, 2014).…”

Section: Optical and Thermal Analysismentioning

confidence: 99%

Influence of optical errors on the thermal and thermodynamic performance of a solar parabolic trough receiver

et al. 2016

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HIGHLIGHTS• Effect of optical errors on performance of a parabolic trough receiver is presented.• Actual heat flux profiles were obtained using Monte Carlo ray tracing and presented.• Thermal and thermodynamic analysis of the receiver is determined numerically.• Effect of optical errors on heat flux and temperature distribution is investigated.• Influence of optical errors on receiver entropy generation rates is presented. ABSTRACTThis paper presents results of an investigation covering the influence of optical errors on the thermal and thermodynamic performance of a solar parabolic trough system. The optical performance was evaluated by using Monte Carlo ray tracing for slope errors and specularity For the range of parameters considered, the intercept factor reduces by up to 21% while the overall thermal efficiency reduces by up to 17% as optical errors increase. Receiver thermodynamic performance is shown to deteriorate as slope errors increase.

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Section: Optical and Thermal Analysismentioning

confidence: 99%

Influence of optical errors on the thermal and thermodynamic performance of a solar parabolic trough receiver

et al. 2016

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“…The emissivity measurements have been performed in cooperation between PTB and SCHOTT Solar CSP GmbH (SCHOTT Solar) [5]. The measurements were done at a temperature of 450 °C and under vacuum, close to the real operating conditions of solar thermal power plants.…”

Section: Emissivity Of Solar Absorber Coatingsmentioning

confidence: 99%

A Facility for Spectral Emissivity Measurement under Vacuum for Industrial and Remote Sensing Applications

Adibekyan

Monte

Hollandt

2017

Ukrainian Metrological Journal

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A variety of techniques for the measurement of emissivity is available today but in many cases these techniques do not adequately meet the wide range of requirements posed by modern science and industry. Furthermore, they do not provide sufficiently accurate results and lack reliable and traceable uncertainties. Therefore, a measurement setup and a validated method for highly accurate directional spectral emissivity, total directional emissivity and total hemispherical emissivity measurements under vacuum in the wavelength range from 4 µm to 100 µm and a temperature range from -40 °C to 600 °C with validated uncertainties was developed at the Physikalisch-Technische Bundesanstalt (PTB). Using a direct radiometric method with two reference blackbodies, the measurements at this facility, the Reduced Background Calibration Facility (RBCF), are traceable to the International Temperature Scale of 1990 (ITS-90).

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“…Each spectrometer produces a reflectance spectrum which, put side by side, allows us to get a reflectance spectrum on the entire spectral range (from 280 to 16000 nm). The method we have developed uses a direct irradiation of sample with a near normal incidence and not a diffuse irradiation [4]. The ideal selective solar absorber should present a high solar absorbance (α>0.9) and a low emittance at working temperature (ε(T)<0.1) [1].…”

Section: Introductionmentioning

confidence: 99%

Development of optical tool for the characterization of selective solar absorber tubes

Braillon

Stollo

Delord

et al. 2016

AIP Conference Proceedings

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Characterization of High Temperature Solar Thermal Selective Absorber Coatings at Operation Temperature

Cited by 10 publications

References 4 publications

Influence of optical errors on the thermal and thermodynamic performance of a solar parabolic trough receiver

Influence of optical errors on the thermal and thermodynamic performance of a solar parabolic trough receiver

A Facility for Spectral Emissivity Measurement under Vacuum for Industrial and Remote Sensing Applications

Development of optical tool for the characterization of selective solar absorber tubes

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