Laser Sealed Evacuated Window Glazings

    Research output: NRELTechnical Report


    The design and fabrication of a highly insulating, evacuated window glazing have been investigated. A thermal network model has been used to parametrically predict the thermal performance of such a window. Achievable design options are predicted to provide a glazing with a thermal conductance less than 0.6 W/m K (R > l0F ft h/Btu) which is compact, lightweight and durable. A colaser has been usedto produce a continuous, leak tight, welded glass perimeter seal around 25 x 25 cm test specimens. Various diameters of regularly spaced spherical support spacers were incorporated in the specimens as well as an integral SnO2:F transparent, low emissivity coating for suppression of radiative heat transfer. Laser sealing rates of .06 cm/s were achieved at a 580 degrees C glass working temperaturewith 400 W of continuous wave (CW) laser power.
    Original languageAmerican English
    Number of pages8
    StatePublished - 1984

    NREL Publication Number

    • NREL/TP-255-2454


    • thermal performance
    • window glazing


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