Pyromark 2500 is a silicone-based high-temperature paint that has been used on central receivers to increase solar absorptance. The radiative properties, aging, and selective absorber efficiency of Pyromark 2500 are presented in this paper for use as a baseline for comparison to high-temperature solar selective absorber coatings currently being developed. The solar absorptance ranged from ∼0.97 at near-normal incidence angles to ∼0.8 at glancing (80°) incidence angles, and the thermal emittance ranged from ∼0.8 at 100 °C to ∼0.9 at 1000 °C. After thermal aging at temperatures of ∼750 °C or higher, the solar absorptance decreased by several percentage points within a few days. It was postulated that the substrate may have contributed to a change in the crystal structure of the original coating at elevated temperatures.
Characterization of Pyromark 2500 Paint for High-Temperature Solar Receivers
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Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received November 2, 2012; final manuscript received March 1, 2013; published online July 22, 2013. Assoc. Editor: Wojciech Lipinski.
The United States Government retains, and by accepting the article for publication, the publisher acknowledges that the United States Government retains, a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for United States Government purposes.
Ho, C. K., Mahoney, A. R., Ambrosini, A., Bencomo, M., Hall, A., and Lambert, T. N. (July 22, 2013). "Characterization of Pyromark 2500 Paint for High-Temperature Solar Receivers." ASME. J. Sol. Energy Eng. February 2014; 136(1): 014502. https://doi.org/10.1115/1.4024031
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