Standard Test Method for Thermal Conductivity of Refractories by Hot Wire (Platinum Resistance Thermometer Technique)

Abstract

5.1 The k-values determined at one or more temperatures can be used for ranking products in relative order of their thermal conductivities. 5.2 Estimates of heat flow, interface temperatures, and cold face temperatures of single and multi-component linings can be calculated using k-values obtained over a wide temperature range. 5.3 The k-values determined are “at temperature” measurements rather than “mean temperature” measurements. Thus, a wide range of temperatures can be measured, and the results are not averaged over the large thermal gradient inherent in water-cooled calorimeters. 5.4 The k-values measured are the combination of the k-values for the width and thickness of the sample, as the heat flow from the hot wire is in both of those directions. The water-cooled calorimeter measures k-value in one direction, through the sample thickness. 5.5 The test method used should be specified when reporting k-values, as the results obtained may vary with the type of test method that is used. Data obtained by the hot wire method are typically 10 % to 30 % higher than data obtained by the water calorimeter method given in Test Method C201.