NDLI: Influence of Spacer Systems on Heat Transfer in Evacuated Glazing

Content Provider	Springer Nature Link
Author	Swimm, K. Weinläder, H. Ebert, H. P.
Copyright Year	2009
Abstract	One attractive possibility to essentially improve the insulation properties of glazing is to evacuate the space between the glass panes. This eliminates heat transport due to convection between the glass panes and suppresses the thermal conductivity of the remaining low pressure filling gas atmosphere. The glass panes can be prevented from collapsing by using a matrix of spacers. These spacers, however, increase heat transfer between the glass panes. To quantify this effect, heat transfer through samples of evacuated glazing was experimentally determined. The samples were prepared with different kinds of spacer materials and spacer distances. The measurements were performed with a guarded hot-plate apparatus under steady-state conditions and at room temperature. The measuring chamber of the guarded hot plate was evacuated to < 10$^{−2}$ Pa. An external pressure load of 0.1 MPa was applied on the samples to ensure realistic system conditions. Radiative heat transfer was significantly reduced by preparing the samples with a low-ε coating on one of the glass panes. In a first step, measurements without any spacers allowed quantification of the amount of radiative heat transfer. With these data, the measurements with spacers could be corrected to separate the effect of the spacers on thermal heat transfer. The influence of the thermal conductivity of the spacer material, as well as the distance between the spacers and the spacer geometry, was experimentally investigated and showed good agreement with simulation results. For mechanically stable matrices with cylindrical spacers, experimental thermal conductance values ≤0.44W·m$^{−2}$ ·K$^{−1}$ were found. This shows that U $_{ g }$-values of about 0.5W · m$^{−2}$ · K$^{−1}$ are achievable in evacuated glazing, if highly efficient low-emissivity coatings are used.
Starting Page	934
Ending Page	948
Page Count	15
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	30
Issue Number	3
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2009-05-19
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hot-plate apparatus Thermal conductance Thermal contact resistance Vacuum insulation glass Physical Chemistry Mechanics Condensed Matter Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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