Vacuum insulation properties of phenolic foam
Characteristic properties of phenolic foam as the interstitial material of a vacuum insulation panel are investigated experimentally. For the measurement of effective thermal conductivity, a vacuum guarded hot plate (VGHP) apparatus is used and the conductivity is measured at various vacuum levels....
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Veröffentlicht in: | International journal of heat and mass transfer 2012-09, Vol.55 (19-20), p.5343-5349 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Characteristic properties of phenolic foam as the interstitial material of a vacuum insulation panel are investigated experimentally. For the measurement of effective thermal conductivity, a vacuum guarded hot plate (VGHP) apparatus is used and the conductivity is measured at various vacuum levels. Radiative properties are found using a Fourier transform infrared spectroscopy (FT-IR) device. Solid conductivity is estimated using the porosity of the foam. Effective thermal conductivity at high level of vacuum is measured to be 5mW/mK which is sum of solid conductivity (2.56mW/mK) and radiative conductivity (2.44mW/mK) with 5% of measurement uncertainty. The pore size of the foam is estimated to be 260μm using rarefied gas conduction theory. This ensures insulation performance of phenolic foam up to about 10−3atm. Other practical characteristics of phenolic foam as the VIP core material are also discussed. |
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ISSN: | 0017-9310 1879-2189 |
DOI: | 10.1016/j.ijheatmasstransfer.2012.05.051 |