Abstract
The use of fine powders to provide high thermal resistance for high-temperature industrial applications and commercial or residential appliances could provide significant energy savings. Theoretical considerations show an apparent thermal conductivity below 0. 0072 W/m multiplied by (times) K (R value equals 20 ft**2 h degree F/Btu/in. ) can be achieved by a system that blocks radiation by use of small diameter particles and increases the mean free path in the gas phase by reducing pressure. A model that includes radiative and conductive heat transfer is used to discuss the requirements for a high thermal resistance material. Thermal conductivity measurements are reported for powders with particle diameters from 7 nm to 500 mu m at pressures from t to 1. 0 multiplied by 10**5 Pa and temperatures from 296 to 339 K.
| Original language | English |
|---|---|
| Pages (from-to) | 213-225 |
| Number of pages | 13 |
| Journal | High temperature science |
| Volume | 19 |
| Issue number | 2 |
| Publication status | Published - 1 Apr 1984 |
| Externally published | Yes |
ASJC Scopus subject areas
- General Engineering