SYMPOSIA PAPER Published: 01 January 1997
STP12280S

Development of Vacuum Super Insulations with Glass Cover and Powder Filling

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An evacuated thermal insulation panel has been developed consisting of glass panes as covers and a powder filling. Several powder materials and mixtures of powders have been tested regarding their thermal conductivity and the critical gas pressure for the onset of gas conductivity. With an opacified precipitated silica powder a thermal conductivity of less than 0.003 W/mK could be reached if evacuated below 0.1 mbar. A value of 0.004 W/mK has been measured at an internal gas pressure of 1 mbar. A crucial point of panel design is the rim seal which should provide a negligible gas permeation and a small thermal heat transfer coefficient. With very thin stainless steel foils these requirements could be met.

Author Information

Caps, R
Bayerisches Zentrum für Angewandte Energieforschung (ZAE Bayern), Würzburg, Germany
Rettelbach, Th
Bayerisches Zentrum für Angewandte Energieforschung (ZAE Bayern), Würzburg, Germany
Ehrmanntraut, M
Physikalisches Institut der Universität Würzburg, Würzburg, Germany
Korder, S
Physikalisches Institut der Universität Würzburg, Würzburg, Germany
Fricke, J
Physikalisches Institut der Universität Würzburg, Würzburg, Germany
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Details
Developed by Committee: C16
Pages: 270–282
DOI: 10.1520/STP12280S
ISBN-EB: 978-0-8031-5373-8
ISBN-13: 978-0-8031-2409-7