Vacuum insulation properties of phenolic foam
- 8 June 2012
- journal article
- Published by Elsevier BV in International Journal of Heat and Mass Transfer
- Vol. 55 (19-20), 5343-5349
- https://doi.org/10.1016/j.ijheatmasstransfer.2012.05.051
Abstract
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 5 mW/m K which is sum of solid conductivity (2.56 mW/m K) and radiative conductivity (2.44 mW/m K) with 5% of measurement uncertainty. The pore size of the foam is estimated to be 260 μm using rarefied gas conduction theory. This ensures insulation performance of phenolic foam up to about 10−3 atm. Other practical characteristics of phenolic foam as the VIP core material are also discussed.Keywords
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