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Abstract
An experimental study has been carried out to investigate the material spatial variability in the cross section of six cellular plastic insulations. The products used in the investiation included the gas-filled closed cell phenolic, isocyanurate, urethane and extruded polystyrene foams and the expanded polystyrene boards. The steady state thermal conductivity of the full board specimens both with and withoug the presence of the facer material was determined employing a heat flow meter apparatus. Each board specimen was then sliced into 5mm thin layers with a horizontal bandsaw cutting device and remeasured. The thermal conductivity and the foam density of the thin layers were individually measured. Results of measurements varied significantly depending on the location of the layer in the cross section of the board in which the specimen was prepared. In most cases, material layers near the surface displayed lower thermal conductivity and higher density values; whereas those thin layers in the center region showed higher thermal conductivity and correlation can be established between the thermal conductivity and the location of the thin layers in the cross section of the foam board. A similar correlation was also evident between the density and the location of the thin layers.
An experimental study has been carried out to investigate the material spatial variability in the cross section of six cellular plastic insulations. The products used in the investiation included the gas-filled closed cell phenolic, isocyanurate, urethane and extruded polystyrene foams and the expanded polystyrene boards. The steady state thermal conductivity of the full board specimens both with and withoug the presence of the facer material was determined employing a heat flow meter apparatus. Each board specimen was then sliced into 5mm thin layers with a horizontal bandsaw cutting device and remeasured. The thermal conductivity and the foam density of the thin layers were individually measured. Results of measurements varied significantly depending on the location of the layer in the cross section of the board in which the specimen was prepared. In most cases, material layers near the surface displayed lower thermal conductivity and higher density values; whereas those thin layers in the center region showed higher thermal conductivity and correlation can be established between the thermal conductivity and the location of the thin layers in the cross section of the foam board. A similar correlation was also evident between the density and the location of the thin layers.
Date
9/1989
9/1989
Author(s)
Norman Low
Norman Low
Page(s)
18
18
Keyword(s)
thermal conductivity; thermal resistance; foam density; cellular plastic; gas filled foam
thermal conductivity; thermal resistance; foam density; cellular plastic; gas filled foam