Electrochromic Materials For Controlled Radiant Energy Transfer In Buildings

Ronald B. Goldner; R. David Rauh

doi:10.1117/12.936298

1 December 1983 Electrochromic Materials For Controlled Radiant Energy Transfer In Buildings

Ronald B. Goldner, R. David Rauh

Proceedings Volume 0428, Optical Materials and Process Technology for Energy Efficiency and Solar Applications; (1983) https://doi.org/10.1117/12.936298
Event: 27th Annual Technical Symposium, 1983, San Diego, United States

Abstract

Windows and building envelopes with an externally variable light transmission can be used to reduce significantly heating and cooling loads. Thin film, large area electrochromic structures are conceptualized which would permit reversible aperture control through applica-tion of small dc electrical currents. The structures have the generalized geometry TEC/EC₁/FIC/EC₂/TEC, where TEC is a thin transparent electrical conductor, EC₁. and EC₂ are complementary electrochromic layers, and FIC is a fast ion conductor. Measurements of the optical properties of the polycrystalline electrochromic oxide H_xWO₃ show large increases in reflectivity on increasing x, an effect not pronounced in the more frequently investigated amorphous material. The variation of the optical constants with x are used to demonstrate the dominance of free electron scattering in determining the optical properties. It is therefore concluded that electrochromic windows based on polycrystalline electrochromic layers may be operated in a reflectivity mode, which has several important advantages over variable absorption operation.

Citation Download Citation

Ronald B. Goldner and R. David Rauh "Electrochromic Materials For Controlled Radiant Energy Transfer In Buildings", Proc. SPIE 0428, Optical Materials and Process Technology for Energy Efficiency and Solar Applications, (1 December 1983); https://doi.org/10.1117/12.936298

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