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Technical Briefs

Characterization of Pyromark 2500 Paint for High-Temperature Solar Receivers

[+] Author and Article Information
Clifford K. Ho

e-mail: ckho@sandia.gov

Timothy N. Lambert

Sandia National Laboratories,
P.O. Box 5800, MS-1127,
Albuquerque, NM 87185-1127

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.

J. Sol. Energy Eng 136(1), 014502 (Jul 22, 2013) (4 pages) Paper No: SOL-12-1292; doi: 10.1115/1.4024031 History: Received November 02, 2012; Revised March 01, 2013

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.

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References

Figures

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Fig. 1

Spectral directional absorptance of Pyromark 2500 samples. Error bars represent one standard deviation.

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Fig. 2

Spectral directional absorptance of Pyromark 2500 on Inconel at incidence angles of 10 deg, 40 deg, 60 deg, and 80 deg at room temperature (∼29 °C) [7]

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Fig. 3

Normalized solar-weighted total directional absorptance of Pyromark 2500 on different substrates as a function of incidence angle

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Fig. 4

Spectral emittance of Pyromark 2500 on Inconel [7], SS304 [7], and cold-rolled steel (from Tempil) at an incidence angle of 10 deg at various temperatures

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Fig. 5

Total hemispherical emittance as a function of temperature for Pyromark 2500 on cold-rolled steel calculated using spectral near-normal emittances that were measured at different temperatures (26 and 600 °C)

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