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Selective absorbing surface for evacuated solar collector tubes

Author

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  • Shi, Yueyan
  • Yang, Xiaoji

Abstract

The absorptance of AlN-Al(absorbing coating)/Al solar spectrum(0.34 ≈ 2.5 μ m) selective absorbing surface, containing 8-layer AlN-Al composite materials and with distinctive or non-boundaries between the layers, deposited by sputtering technology and heat-treated at 400 °C (60min) is about 0.95 and its thermal emittance is close to 0.07 ≈ 0.08(80 °C). But on the condition that the absorptance is unchanged, the thermal emittance dropped to 0.04 for the AlN-Al coating composed of matel volum fractionic 0.42, 0.25 and 0.00 films.

Suggested Citation

  • Shi, Yueyan & Yang, Xiaoji, 1999. "Selective absorbing surface for evacuated solar collector tubes," Renewable Energy, Elsevier, vol. 16(1), pages 632-634.
    • Handle: RePEc:eee:renene:v:16:y:1999:i:1:p:632-634
    DOI: 10.1016/S0960-1481(98)00240-7
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