Development and Testing of High-Temperature Solar Selective Coatings

Research output: Contribution to conferencePaper


The Solar Energy Technologies Program is working to reduce the cost of parabolic trough solar power technology. System studies show that increasing the operating temperature of the solar field from 390? to >450?C will result in improved performance and cost reductions. This requires the development of new more-efficient selective coatings that have both high solar absorptance (>0.96) and lowthermal emittance (<0.07) and are thermally stable above 450?C, ideally in air. Potential selective coatings were modeled, identified for laboratory prototyping, and manufactured at NREL. Optimization of the samples and high-temperature durability testing will be performed. Development of spectrally selective materials depends on reliable characterization of their optical properties. Protocolsfor testing the thermal/optical properties of selective coatings were developed and a round-robin experiment was conducted to verify and document the reflectance and high-temperature emittance measurements. The development, performance, and durability of these materials and future work will be described.
Original languageAmerican English
Number of pages5
StatePublished - 2005
Event2004 DOE Solar Energy Technologies Program Review Meeting - Denver, Colorado
Duration: 25 Oct 200428 Oct 2004


Conference2004 DOE Solar Energy Technologies Program Review Meeting
CityDenver, Colorado

Bibliographical note

Presented at the 2004 DOE Solar Energy Technologies Program Review Meeting, 25-28 October 2004, Denver, Colorado. Also included in the proceedings available on CD-ROM (DOE/GO-102005-2067; NREL/CD-520-37140)

NREL Publication Number

  • NREL/CP-520-36581


  • high-temperature
  • low thermal emittance
  • parabolic trough
  • PV
  • selective coatings
  • solar power technology


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