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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

ON THE THEORETICAL PREDICTION OF THE EFFECTIVE THERMAL CONDUCTIVITY OF BRICKS

Get access (open in a dialog) DOI: 10.1615/IHTC8.270
pages 627-632

Resumo

The knowledge of the effective thermal conductivity of bricks is very important for materials of buildings. The experimental measurement of the thermal conductivity is fundamental but also the theory of heat transfer in an unsaturated porous medium, like the brick, reveals its importance. The theoretical model proposed in this work assumes the porous medium as a cubic space with a centered solid cubic grain. The liquid water present in the brick in unsaturated conditions is situated around the grain according to the phenomena of adsorption and capillarity. If the constituents of the brick are known it is possible to evaluate the effective thermal conductivity without empirical constants and other experimental data. Otherwise, it is necessary to know the experimental thermal conductivities of the saturated and/or dry brick. The theoretical predictions of this work are compared to some experimental data. Predictions are carried on also for unsaturated frozen brick with some unfrozen water.