2 December 1985 Evacuated Window Glazings for Energy Efficient Buildings
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The design and fabrication of a highly insulating window glazing is being studied at SERI. Computer aided design analyses indicate that an all glass, edge sealed vacuum window with spherical glass interpane spacers and a low emittance, coating,on one internal surface could exhibit a thermal conductance of less than 0.6 W/m2K (thermal resistance, R > 10°F ft h/Btu). Cost effective means of mass-producing such a glazing have been explored. A CO2 laser has been used to produce a continuous, leak tight welded glass perimeter at 580°C, and this process appears to be a promising approach. However, at this temperature in vacuum, few low-emissivity coatings retain their desirable properties. Systemmatic measurements were made on tin oxide (fluorine doped) and indium-tin oxide low-e coatings. The indium-tin oxide was shown to be improved by vacuum heating. The ratio of solar weighted transmittance to emittance (313 K black-body weighted), a measure of performance in this application, is shown to have a sharply defined maximum at a coating sheet resistance of approximately 5 ohms per square in both of these oxide semiconductor coatings.
© (1985) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
D. K. Benson and C. E. Tracy "Evacuated Window Glazings for Energy Efficient Buildings", Proc. SPIE 0562, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion IV, (2 December 1985); doi: 10.1117/12.966313; https://doi.org/10.1117/12.966313

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