Thermal conductivity of insulating refractory materials: Comparison of steady-state and transient measurement methods
Diana Vitiello,
Benoit Nait-Ali,
Nicolas Tessier-Doyen,
Thorsten Tonnesen,
Luís Laím,
Lionel Rebouillat,
David S. Smith
Affiliations
Diana Vitiello
University of Limoges, IRCER, 12 Rue Atlantis, F-87068, Limoges, France; Corresponding author.
Benoit Nait-Ali
University of Limoges, IRCER, 12 Rue Atlantis, F-87068, Limoges, France
Nicolas Tessier-Doyen
University of Limoges, IRCER, 12 Rue Atlantis, F-87068, Limoges, France
Thorsten Tonnesen
RWTH Aachen University, Institute of Mineral Engineering, Mauerstrasse 5, D-52064, Aachen, Germany
Luís Laím
University of Coimbra, Institute for Sustainability and Innovation in Structural Engineering, Rua Luís Reis Santos - Pólo II, 3030-788 Coimbra, Portugal
Measurements of thermal conductivity with the heat flow meter, laser flash method, hot disk method and hot wire method are compared on two kinds of refractory materials: Insulating Boards and Insulating Fireclay Bricks. Heat losses, humidity, anisotropy and heterogeneity can explain the variation in thermal conductivity values obtained with the different techniques. If they are taken into account in the analysis, discrepancy within 10% can be found. The choice of the technique depends on the investigated material and on the level of information required.
