Overview
The Thermal Conductivity of Insulating Powder apparatus employs a concentric sphere or guarded hot plate method to determine the thermal conductivity of loose, granular, or powder insulating materials. The powdered sample fills the annular space between a heated inner sphere and a cooled outer sphere (or between plates), and steady-state temperature difference and heat input are recorded. The experiment provides insight into how powder density, particle size, and moisture content affect insulation performance. It is relevant to the selection of refractory linings, building insulation, and industrial pipe lagging materials.
Specifications
| Method | concentric sphere / guarded plate |
| Sample | powder / granular material |
| Heater | electric, 0 to 100W |
| Temperature range | ambient to 200 degrees C |
| Temperature sensors | thermocouples, multiple points |
| Sample cell | machined aluminium / brass |
| Guard heater | provided for 1D heat flow |
| Power supply | 220V AC, 50 Hz |
