THE OPTIMIZED OPTICAL REQUIREMENT FOR SPECTRALLY SELECTIVE ABSORBERS

摘要：

It is investigated how the intrinsic optical properties of the metal and dielectric constituents in composite spectrally selective solar absorber coatings influence its solar absorptance and thermal emittance. Theoretical modeling using Bruggeman effective medium theory has been used to analyze the basic features in the effective optical constants of the composite layer that are required in order to obtain high solar absorptance in combination with low thermal emittance. It is found that the requirement is correlated to certain dispersion of extinction coefficient and refractive index. The metallic content of used composite should be large enough to give a reasonable extinction coefficient, but not beyond the metal-nonmetal transition point. The ideal dispersion for refractive index should decrease with increasing wavelength in the transition wavelength region. So does the extinction coefficient.

作者: Shuxi Zhao Ewa W(a)ckelg(a)rd

作者单位: Uppsala University, The (A)ngstr(o)m Laboratory, P.O.Box 534, S-751 21 Uppsala, Sweden

会议类型: 国际会议

会议名称: 2007世界太阳能大会(Proceedings of ISES Solar World Congress 2007)

会议地点: 北京

会议语种:英文

在线出版日期: 2007-09-18（万方平台首次上网日期，不代表论文的发表时间）