Heat Transport and Thermal Expansion of Electrochromic Glazing Systems Due to Solar Irradiation

For many technical and architectural applications of electrochromic glazings a thorough understanding of the heat transport and the optical and thermal radiative properties of the system is essential. Furthermore, the thermal expansion and eventually the induced stresses within the laminated system...

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Bibliographic Details
Published in:International journal of thermophysics 2004-07, Vol.25 (4), p.1299-1307
Main Authors: Fischer, U., Häusler, T., Rogaß, H., Rottmann, M., Kraft, A., Heckner, K.-H.
Format: Article
Language:English
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Summary:For many technical and architectural applications of electrochromic glazings a thorough understanding of the heat transport and the optical and thermal radiative properties of the system is essential. Furthermore, the thermal expansion and eventually the induced stresses within the laminated system are of interest. To meet these demands the solar absorptance of the electrochromic glazings at different tinted states were measured using an UV-VIS-NIR spectrometer. The thermal expansion coefficients of the glass materials were determined by a push-rod dilatometer. Then the instationary coupled conductive and radiative heat transfer due to solar irradiation were calculated for various pane configurations by finite element analysis. Starting from the resulting instationary temperature fields, the stress and strain states within the laminated. glazing system were calculated. There is tremendous potential for such electrochromic glazings. For example, switchable filters for light and heat within optical instruments, rapid responding sunglasses, and large area information displays are feasible. In the car industry the adoption of electrochromic systems in sunroofs with overheating protection and for windshields and rear view mirrors with glare protection is advantageous. Electrochromic glazing can be used in smart windows without any mechanical sun protection systems which can change gradually the transmittance in response to the intensity of the solar radiation. Such windows prevent overheating of rooms during intense sunshine and therefore minimize energy for climatization. Protection against glare and electromagnetic radiation are additional advantages.
ISSN:0195-928X
DOI:10.1023/B:IJOT.0000038517.43854.b1