Intercomparison “Emissivity of thermal paints” in the temperature range from 100 °C to 800 °C

C. Monte1, M. Becker1, J. Hollandt1, J. Manara2, M. Arduini-Schuster 2, S. Kabelac3, R. Conrad3, F. Greffrath4, V. Scherer4, R. Kulenovic5, M. Linder6, A. Steinbeck7 and R. Pfeil8

1Physikalisch-Technische Bundesanstalt, Braunschweig und Berlin, Berlin, Germany
2Bayerisches Zentrum für Angewandte Energieforschung e.V., Am Hubland, Würzburg, Germany
3Helmut Schmidt Universität, Hamburg, Germany
4Lehrstuhl für Energieanlagen und Energieprozesstechnik, Ruhr-Universität Bochum, Bochum, Germany
5Institut für Kernenergetik und Energiesysteme, Universität Stuttgart, Stuttgart, Germany
6Institut für Technische Thermodynamik, Deutsches Zentrum für Luft- und Raumfahrt e. V., Stuttgart, Germany
7Institut für Raumfahrtsysteme, Universität Stuttgart, Stuttgart, Germany
8Rolls-Royce Mechanical Test Operations Centre GmbH, Blankenfelde-Mahlow

Keywords: intercomparison thermal-radiation
property: emissivity
material: high emissivity paint

A star intercomparison about "Spectral and total emissivity of thermal paints in the temperature range from 100 °C to 800 °C" was conducted among members of the Thermophysics Working Group within the German Society for Thermal Analysis (AK Thermophysik)[1]. Two sets of samples coated with the high emissivity black paints Rolls-Royce HE6 and HE23 were prepared. Due to the variety of different experimental setups for emissivity measurement among the participants the samples had to be of different geometry. The samples were extensively heat treated and investigated for sample-to-sample variation in advance of the measurement campaign. Afterwards they were investigated for aging. The results of these investigations were added to the general and individual measurement uncertainties of the emissivity measurements.
A good agreement of the spectral and total emissivity results among the participants was obtained in most cases with respect to the individual measurement uncertainties given by each participant . The preparation and characterization of the samples, the evaluation scheme and the final results of the intercomparison will be presented.


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