Journal of the Korean Solar Energy Society (한국태양에너지학회 논문집)

The Korean Solar Energy Society (한국태양에너지학회)
권호 표지
DOI QR코드

DOI QR Code

Performance Evaluation of Selective Coatings for Solar Thermal Collectors

태양열 집열기에 사용될 선택흡수막의 성능 평가

  • Received : 2012.04.14
  • Accepted : 2012.07.16
  • Published : 2012.08.30
Download PDF
⟨ Previous Next ⟩

Abstract

Metal-metal oxide (M-M oxide) cermet solar selective coatings with a double cermet layer film structure were deposited on the Al-deposited glass substrate by using a directed current (DC) magnetron sputtering technology. M oxide (CrO and ZrO) was used as the ceramic component in the cermets, and Cr and Zr used as the metallic components. In addition, black Cr (Cr-$Cr_2O_3$ cermet) solar selective coatings were deposited on the Ni-plated Cu substrate by using a electroplating method for comparison. The thermal stability tests were carried out for performance evaluation of solar coatings. Reflectance measurements were used to evaluate both solar absorptance(${\alpha}$) and thermal emittance (${\epsilon}$) of the solar coatings before and after thermal testing by using a spectrometer. Optical properties of optimized cermet solar coatings were ${\alpha}{\simeq}0.94-0.96$ and ${\epsilon}{\simeq}0.1$ ($100^{\circ}C$). The results of thermal stability test of M-M oxide solar coatings showed that the Cr-CrO cermet solar selective coatings were more stable than the Zr-ZrO cermet selective coatings at temperature of both $400^{\circ}C$ in air and $450^{\circ}C$ in vacuum. The black Cr solar selective coatings were degraded in air at temperature of $400^{\circ}C$. The main optical degradation modes of these coatings were diffusion of metal atoms, and oxidation.

Keywords

References

  1. X. Xiao, L. Miao, G. Xu, L. Lu, Z. Su, N. Wang and S. Tanemura, Appl. Surf. Sci. 257,10729 (2011). https://doi.org/10.1016/j.apsusc.2011.07.088
  2. K.D. Lee, J. Korean Phy. Soc. 49, 187 (2006),
  3. K. D.L ee, J. Korean Phy. Soc. 55, 1487 (2009).
  4. K. D. Lee, J. Korean Sol. Energy. Soc. 28, 33(2008)
  5. Q. C. Zhang, M. S. Hadavi, K. D.L ee, and Y. G. shen, J. Phys. D: Appl. Phys. 36, 723 (2003). https://doi.org/10.1088/0022-3727/36/6/315
  6. Q. -C. Zhang, Sol Energy Mater. and Sol Cells 62, 63(2000). https://doi.org/10.1016/S0927-0248(99)00136-1
  7. Q-C. Zhang, D. R. Mills. J. Appl. Phys. 72. 3013 (1992). https://doi.org/10.1063/1.351510
  8. Q-C. Zhang, D. R. Mills. Sol. Energy Mater. Sol. Cells 27, 273 (1992). https://doi.org/10.1016/0927-0248(92)90089-8
  9. J. M. Sweet, R. B. Pettit and M. B. Chamberlain, Sol. Energy Maer.10, 251 (1984) https://doi.org/10.1016/0165-1633(84)90034-0
  10. J. A. Duffie and W. A. Beckman, Solar Engineering of Thermal Processes, 2nd ed. (Wiley-Interscience, New York,1991).
  11. G. Zajac, G. B. Smith and A. Ignatiev, J. Appl. Phys. 51, 5544 (1980) https://doi.org/10.1063/1.327475
  12. K. D. Lee, W. C. Jung and J. K. Kim, Sol. Energy Mater. Sol. Cells 62, 63 (2000). https://doi.org/10.1016/S0927-0248(99)00136-1
  13. G. B. Smith and A. Agnatiev, Sol. Energy Mater. 4, 119 (1981). https://doi.org/10.1016/0165-1633(81)90036-8
  14. T. K. Bostrom, E. Wackelgard and G. Westin, Sol. Energy Mater. Sol. Cells 89, 197 (2005) https://doi.org/10.1016/j.solmat.2005.01.014

Cited by

  1. Study on Thermal Dewatering of Sludge Using the Parabolic Through Collector(PTC) Solar Collector vol.34, pp.3, 2014, https://doi.org/10.7836/kses.2014.34.3.049