OSA's Digital Library

Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 19 — Jul. 1, 1999
  • pp: 4189–4197

Angular Solar Absorptance of Absorbers Used in Solar Thermal Collectors

Tuquabo Tesfamichael and Ewa Wäckelgård  »View Author Affiliations


Applied Optics, Vol. 38, Issue 19, pp. 4189-4197 (1999)
http://dx.doi.org/10.1364/AO.38.004189


View Full Text Article

Acrobat PDF (200 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

The optical characterization of solar absorbers for thermal solar collectors is usually performed by measurement of the spectral reflectance at near-normal angle of incidence and calculation of the solar absorptance from the measured reflectance. The solar absorptance is, however, a function of the angle of incidence of the light impinging on the absorber. The total reflectance of two types of commercial solar-selective absorbers, nickel-pigmented anodized aluminum, and sputtered nickel/nickel oxide coated aluminum are measured at angles of incidence from 5° to 80° in the wavelength range 300–2500 nm by use of an integrating sphere. From these measurements the angular integrated solar absorptance is determined. Experimental data are compared with theoretical calculations, and it is found that optical thin-film interference effects can explain the significant difference in solar absorptance at higher angles for the two types of absorbers.

© 1999 Optical Society of America

OCIS Codes
(160.1190) Materials : Anisotropic optical materials
(260.3160) Physical optics : Interference
(310.1620) Thin films : Interference coatings
(310.6860) Thin films : Thin films, optical properties
(310.6870) Thin films : Thin films, other properties
(350.6050) Other areas of optics : Solar energy

Citation
Tuquabo Tesfamichael and Ewa Wäckelgård, "Angular Solar Absorptance of Absorbers Used in Solar Thermal Collectors," Appl. Opt. 38, 4189-4197 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-19-4189


Sort:  Author  |  Year  |  Journal  |  Reset

References

  1. H. Tabor, “Selective radiation II. Wavelength discrimination,” Bull. Res. Counc. Isr. Sect. A. Chem. 5, 129–134 (1956).
  2. H. Tabor, “Selective radiation I. Wavelength discrimination,” Bull. Res. Counc. Isr. Sect. A. Chem. 5, 119–128 (1956).
  3. J. T. Gier and R. V. Dunkle, “Selective spectral characteristics as an important factor in the efficiency of solar collectors,” in Transactions of the Conference on the Use of Solar Energy (University of Arizona, Tucson, Ariz., 1955), Vol. 2, pp. 41–56.
  4. C. M. Lampert, “Coatings for enhanced photothermal energy collection,” Solar Energy Mater. 2, 1–17 (1979).
  5. Å. Andersson, O. Hunderi, and C. G. Granqvist, “Nickel pigmented anodic aluminum oxide for selective absorption of solar energy,” J. Appl. Phys. 51, 754–764 (1980).
  6. G. A. Niklasson, C. G. Granqvist, and O. Hunderi, “Effective medium models for the optical properties of inhomogeneous materials,” Appl. Opt. 20, 26–30 (1981).
  7. T. Tesfamichael, S. Andersson, T. Chibuye, and E. Wäckelgård, “Study of oxidation kinetics for metal-dielectric films using IR optical measurements,” in Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XV, C. M. Lampert, C. G. Granqvist, M. Graetze, S. K. Deb, eds., Proc. SPIE 3138, 197–204 (1997).
  8. R. Gatt, G. A. Niklasson, and C. G. Granqvist, “Degradation modes of Cermet based selective solar absorber coatings,” in Optical Material Technology for Energy Efficiency and Solar Energy Conversion XI: Selective Solar Absorbers, A. H. Goff, C. G. Granqvist, and C. M. Lampert eds., Proc. SPIE 1727, 87–101 (1992).
  9. G. A. Niklasson, “Theoretical model for the durability of the solar selective absorber coatings at elevated temperatures,” in Energy and the Environment into the 1990s, A. A. M. Sayigh, ed. (Pergamon, Oxford, 1990), Vol. 3, pp. 1372–1376.
  10. E. Wäckelgård, “A comparative study of the optical properties of nickel pigmented alumina films of different thicknesses exposed to elevated temperature and humidity,” Solar Energy Mater. Solar Cells 54, 171–179 (1998).
  11. J. A. Duffie and W. A. Beckman, Solar Engineering of Thermal Processes, 2nd ed. (Wiley-Interscience, New York, 1991), pp. 209–210.
  12. R. B. Pettit and R. R. Sowell, “Solar absorptance and emittance properties of several solar coatings,” J. Vac. Sci. Technol. 13, 596–602 (1976).
  13. E. Wäckelgård, “A study of the optical properties of nickel-pigmented anodic aluminum in the infrared region,” J. Phys. Condens. Matter 8, 5125–5138 (1996).
  14. G. H. Pontifex, P. Zhang, Z. Wang, T. L. Haslett, D. AIMawlawi, and M. Moskovits, “STM imaging of the surface of small metal particles formed in anodic oxide pores,” J. Phys. Chem. 95, 9989–9993 (1991).
  15. S. Nakamura, M. Saito, L.-F. Hunga, M. Miyagi, and K. Wada, “Infrared optical constants of anodic alumina films with micropore arrays,” Jpn. J. Appl. Phys. 31, 3589–3593 (1992).
  16. E. Wäckelgård and G. Hultmark, “Industrially sputtered solar absorber surface,” Solar Energy Mater. Solar Cells 54, 165–170 (1998).
  17. P. Nostell, A. Roos, and D. Rönnow, “Single beam integrating sphere spectrophotometer for R- and T-measurements versus angle of incidence in the solar wavelength range on diffuse and specular samples,” Rev. Sci. Instrum. 70, 2481–2494 (1999).
  18. 9845–1 ISO, “Solar energy—reference solar spectral irradiance at the ground at different receiving conditions-” (International Organisation for Standardization, Geneva, Switzerland, 1992).
  19. M. A. Lind, R. B. Pettit, and K. D. Masterson, “The sensitivity of solar transmittance reflectance and absorptance to selected averaging procedures and solar irradiance distributions,” Trans. Am. Soc. Mech. Eng. 102, 34–40 (1980).
  20. E. Wäckelgård, T. Chibuye, and B. Karlsson, “Improved solar optical properties of a nickel pigmented anodized aluminum selective surface,” in Energy Conservation in Buildings, Proceedings of NORTHSUN 90, A. A. M. Sayigh ed. (Pergamon, Oxford, 1990), pp. 177–182.
  21. A. Thelen, Design of Optical Interference Coatings (McGraw-Hill, New York, 1989), Chap. 2, pp. 23–24 and Chap. 9, pp. 177–178.
  22. A. Roos, “Use of an integrating sphere in solar energy research,” Solar Energy Mater. Solar Cells 30, 77–94 (1993).
  23. G. B. Smith, “Theory of angular selective transmittance in oblique columnar thin films containing metal and voids,” Appl. Opt. 29, 3685–3693 (1990).
  24. A. P. Lenham and D. M. Treherne, Optical Properties and Electronic Structure of Metals and Alloys (North-Holland, Amsterdam, 1966).
  25. P. J. Gielisse, J. N. Plendl, L. C. Mansur, G. R. Marshall, S. S. Mitra, R. Mykolajewycz, and S. Smakula, “Infrared properties of NiO and CoO and their mixed crystals,” J. Appl. Phys. 36, 2446–2450 (1965).
  26. T. S. Eriksson, A. Hjortsberg, G. A. Niklasson, and C. G. Granqvist, “Infrared optical properties of evaporated alumina films,” Appl. Opt. 20, 2742–2746 (1981).
  27. J. H. Weaver, “Handbook of chemistry and physics,” in Optical Properties of Metals, D. R. Lide, ed. (CRC Press, Boca Raton, Fla., 1993), Sect. 12, pp. 111–126.

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.


« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited