Thermal Resistance of an Insulation Sample
1. CLIENT
NRG Building Systems Pty Ltd, 30 Binary Street, Yatala, QLD 4207, Australia
2. DESCRIPTION OF TEST EQUIPMENT
The test equipment used was a LaserComp Fox 600 heat flow meter. The specimen for testing is placed horizontally in the apparatus, with upwards heat flow. The hot and cold plates each have a 250 mm x 250 mm heat flux transducer embedded in their surface. The edges of the specimen are insulated from the room ambient temperature.
3. PROCEDURE
The specimen was supplied by the client and consisted of one piece of light green polystyrene. The dimensions of the sample were 595 x 595 mm. It was tested at its actual thickness, to the requirements of ASTM C518-04.
4. RESULTS
| Nominal Upper Plate Temperature | 13 °C | |
| Nominal Lower Plate Temperature | 33 °C | |
| Nominal Difference in Temperature | 20 K | |
| Nominal Mean Temperature | 23 °C | |
| Calibration check | 20-Apr-09, EPS 01 | |
| BRANZ reference | D4393 | |
| ‘grams per sq. metre’ | 1325 | |
| Sample weight | gram | 469 |
| Test date | 22-Apr | |
| Test thickness | mm | 72.7 |
| Density | kg/m3 | 18.2 |
| Temperature difference | K | 20.0 |
| Mean temperature | °C | 23.0 |
| Heat-flux | W/m2 | 10.67 |
| Thermal resistance (for four pieces) | m2K/W | 1.874 |
| Thermal conductivity | W/mK | 0.0388 |
| Difference between heat flux transducers | % | 0.1 |
These measurements comply with the requirements of ASTM C518. The uncertainty in the measurements of thermal conductivity and thermal resistance are estimated to be ± 3%.
5. REFERENCES
ASTM C518-04 Standard Test Method for Steady-State Heat Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus.
American Society for Testing and Materials, Philadelphia, PA, 2004.
