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Analysis of thermal conductivity measurement data from international comparison of national laboratories.

Hay, B*; Zarr, R*; Stacey, C; Lira-Cortes, L*; Hammerschmidt, U*; Sokolov, N*; Zhang, J*; Filtz, J R*; Fleurence, N* (2013) Analysis of thermal conductivity measurement data from international comparison of national laboratories. Int. J. Thermophysics, 34 (5). pp. 737-762.

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For the first time under the auspices of BIPM, seven National Metrology Institutes (NMIs) participated in an international inter-laboratory comparison on thermal conductivity measurements by the Guarded Hot Plate method. Measurements were conducted successively by all participants on the same sets of specimens of insulating materials (mineral wool and expanded polystyrene) at temperatures ranging from 10 °C to 40 °C, according to the International Standard ISO 8302. This protocol aims to minimize issues of material variability by circulating the same pairs of specimens among the laboratories following the strict format of a round-robin test program. This pilot study is intended as a first stage for future Key Comparisons between NMIs.
The descriptive analysis of obtained results shows good agreement between laboratories for the mineral wool specimens and the thicker specimens of expanded polystyrene, with relative deviations within the uncertainties of measurement. A positive drift of thermal conductivity values, which has appeared progressively during the comparison process, seems to be correlated with the size of the metering area of the used GHPs. A statistical analysis was apply to the repeated thermal conductivity measurements at 23 °C, in order to identify anomalous and outlying data, to assess the within- and between-laboratory variability, and to evaluate the participant laboratories performance.

Item Type: Article
Keywords: guarded hot plate, inter-laboratory comparison, insulating materials, thermal conductivity
Subjects: Advanced Materials
Advanced Materials > Thermal Analysis of Materials
Identification number/DOI: 10.1007/s10765-012-1225-x
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/6034

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