Abstract :
A spectral optical transmission function s(k) for sun protection insulating glasses is proposed in order to reduce the solar energy load
of a building’s interior and thus reducing overheating. s(k) is based on standard functions such as spectral distribution of solar radiation
Sk(k), spectral photopic luminous efficiency V(k), standard illuminant D65(k), and the CIE color-matching functions xk; y k; zk. In the
framework of the present approach an optimized spectral transmittance smin(k) with a minimal normalized solar energy load (i.e., solar
direct transmittance normalized to light transmittance, se/sv) has been obtained on the condition of color neutrality of the transmitted
light. A comparison with the performance of actual commercial sun protection glasses on the market shows that the present model for an
optimized spectral transmittance could reduce the solar energy load by roughly one third for equal light transmittance sv.
2007 Elsevier Ltd. All rights reserved.
