Fabrication of a Guarded-Hot-Plate Apparatus for Use Over an Extended Temperature Range and in a Controlled Gas Atmosphere.
Fabrication of a Guarded-Hot-Plate Apparatus for Use
Over an Extended Temperature Range and in a Controlled
Gas Atmosphere.
(1336 K)
Zarr, R. R.; Flynn, D. R.; Hettenhouser, J. W.;
Brandenburg, N. J.; Healy, W. M.
International Thermal Conductivity 28th
Conference/International Thermal Expansion 16th
Symposium. Proceedings. June 26-29, 2005, New
Brunswick, Canada, DEStech Publications, Inc.,
Dinwiddie, R.; White, M. A.; McElroy, D. L.,
Editor(s)(s), 235-245 pp, 2005.
Sponsor:
DOE Office of Industrial Technology
Keywords:
guarded-hot-plate apparatus; insulation; temperature
range; gas atmosphere; transmission; equipment;
thermometers; thermocouples; thermopile; calibrating;
vaccum chambers
Abstract:
This paper describes a guarded-hot-plate apparatus
suitable for determining the steady-state thermal
transmission properties of insulation specimens from 90
K to 900 K in a controlled gas atmosphere from 10-5 kPa
to 105 kPa. The apparatus accommodates flat-slab
specimens 500 mm in diameter and from 13 mm to 100 mm in
thickness. Fabrication and assembly details are
presented for the apparatus hot and cold plates, guard
system surrounding the plates, temperature sensors,
metal-sheathed heaters, and vacuum/gas pressurization
system. An initial assessment of the calibration
uncertainties for the primary measurement sensors is
presented.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899