High Temperatures-High Pressures · 2001 · 76 citations · 0 references
EngineeringMaterials EngineeringMaterials ScienceBuilding MaterialsBuilding PhysicsHeat TransferHeat ConductionInsulation MaterialsInsulation SystemsThermal InsulationThermal Management MaterialsThermal Properties Of MaterialsBuilding Envelope Thermal PropertiesBuilding FacadesGas Pressure EffectsInsulating MaterialsInsulation TechnologySilicon CarbideThermal ConductivityVacuum Insulation
The thermal conductivity of pyrogenic silica pcwder boards mixed with a silicon carbide opacifier is measured as a function of gas pressure and of temperature. At room temperature and gas pressures around 1 to 5 mbar the thermal conductivity is about 0.004 W m -1 K -1 . At a mean temperature of 300 C the evacuated panel has a thermal conductivity well below 0.010 W m -1 K -1 , because of the silicon carbide opacifier. Several square metres of vacuum panels have been encapsulated in laminated aluminium envelopes and tested as thermal insulations for building facades.