Abstract
This paper presents experimental results concerning thermal properties of phenolic foams, with or without activated carbon. Effective thermal conductivity (keff) of various samples is measured using heat flow thermal conductivity testers that comply with ASTM C518. Transmittance spectra are taken using FTIR for samples of various densities. Extinction coefficient spectra are obtained by applying Beer's law. The Rosseland mean extinction coefficients and radiative thermal conductivities are then obtained for various temperatures. Results show that keff increases with temperature. Furthermore, it takes only approximately 2 hours for the sample to become saturated with moisture. The keff of saturated samples is about 20 % higher than that of the dry samples. Addition of activated carbon shows no appreciable effect on keff. The extinction coefficient increases with sample density. Radiation accounts for approximately 15% of the total heat transfer for phenolic foams at near room temperatures.
| Original language | English |
|---|---|
| Pages (from-to) | 753-758 |
| Number of pages | 6 |
| Journal | Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an |
| Volume | 25 |
| Issue number | 6 |
| DOIs | |
| State | Published - 2002 |
Keywords
- Effective thermal conductivity
- Phenolic foam
- Thermal insulation
- Transmission spectra