Technique for measuring the apparent thermal conductivity of flat insulation
Abstract
A technique for measuring the apparent thermal conductivity, gamma, of flat insulations - either batt or loose - is described. This technique consists of a flat Nichrome-screen wire sandwiched between two samples and heated electrically. Results from a limited experimental test are described and compared with results from a pipe insulation tester. Thermal modeling of this system shows that accurate measurement with gamma down to 0.01 W/mK and insulation thicknesses below 0.089 m (3 1/2 in.) should be straightforward. Measurement of gamma for material as thick as 0.305 m (12 in.) should also be possible with a lateral guard scheme to reduce heat flow along the screen wire heater.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- October 1979
- Bibcode:
- 1979STIN...8020549M
- Keywords:
-
- Heat Transmission;
- Thermal Conductivity;
- Thermal Insulation;
- Computer Programs;
- Energy Conservation;
- Finite Difference Theory;
- Mathematical Models;
- Fluid Mechanics and Heat Transfer