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Title: Design and optimization of nanoparticle-pigmented solar selective absorber coatings for high-temperature concentrating solar thermal systems

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.5009252· OSTI ID:1511165
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  1. Dartmouth College, Hanover, NH (United States)
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In this paper, we present a systematic approach for the design and optimization of nanoparticle-pigmented solar selective absorbers for operation at 750 °C. Using the scattering and absorption cross-sections calculated by Lorenz-Mie scattering theory as input, we employ a four-flux radiative transfer method to investigate the solar selectivity mechanism and optimize the optical-to-thermal conversion efficiency (ηtherm) as a function of the metallic nanoparticle material, the nanoparticle diameter, the volume fraction, and the coating thickness. Among the nanoparticle material candidates in this study, C54-TiSi2 is the best option with an optimized ηtherm = 87.0% for a solar concentration ratio of C = 100 and ηtherm = 94.4% for C = 1000 at 750 °C. NiSi is also a promising candidate comparable to TiSi2 in thermal efficiency, Experimentally, an un-optimized 200 nm-diameter TiSi2 nanoparticle-silicone solar selective coating has already achieved ηtherm = 89.8% for C = 1000 at 750 °C. This performance is consistent with the theoretical model and close to the thermal efficiency of the commercial Pyromark 2500 coatings (90.1%). We also demonstrate that Ni/NiSi core-shell structures embedded in the SiO1.5 matrix is thermally stable at 750 °C for 1000 h in air. Lastly, these results indicate that silicide cermet coatings are promising to achieve high optical performance and high temperature thermal stability simultaneously.

Research Organization:
Dartmouth College, Hanover, NH (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0007112
OSTI ID:
1511165
Alternate ID(s):
OSTI ID: 1417521
Journal Information:
Journal of Applied Physics, Vol. 123, Issue 3; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Figures / Tables (16)

FIG. 1(p. 4)figure FIG. 1
FIG. 2(p. 5)figure FIG. 2
FIG. 3(p. 5)figure FIG. 3
FIG. 4(p. 6)figure FIG. 4
FIG. 5(p. 6)figure FIG. 5
FIG. 6(p. 7)figure FIG. 6
FIG. 7(p. 7)figure FIG. 7
FIG. 8(p. 8)figure FIG. 8
FIG. 9(p. 8)figure FIG. 9
Table I(p. 8)table Table I
FIG. 10(p. 9)figure FIG. 10
FIG. 11(p. 9)figure FIG. 11
Table II(p. 9)table Table II
FIG. 12(p. 10)figure FIG. 12
FIG. 13(p. 11)figure FIG. 13
FIG. 14(p. 11)figure FIG. 14

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Related Subjects

36 MATERIALS SCIENCE
14 SOLAR ENERGY