This report describes the final tests carried out on an advanced
apparatus for measurement of thermal conductivity of materials at
atmospheric pressure and different levels of evacuation. The
apparatus was designed and constructed in the phase 1 of the
project. Difficulties with the control system have been solved and
measurements have been carried out on common polystyrene foam
insulation at atmospheric pressure. The measurements have been
compared with results from reference measurements and a difference
of only 0.3% was found in measured thermal conductivity.
Measurements on monolithic silica aerogel were performed at 5
different pressure levels in the range 0.2 - 1000 hPa. The
measured equivalent thermal conductivity is in the range 8.9 -
16.4 mW/(m K) which corresponds very well with results obtained by
institutes in Germany and France.
|Number of pages||11|
|Publication status||Published - 1998|