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Author(s):	Van De Walle, Wouter; Janssen, Hans
Title:	A thermal conductivity prediction model for porous building blocks
Abstract:	A 3D model for the prediction of the effective thermal conductivity of porous building blocks is introduced. Simulations are performed directly on the microstructure using voxel images and the finite element technique. Very good agreement with analytical solutions is achieved. The model is used to investigate the miscalculation effect of 2D simulations, clearly indicating the need for a 3D model. Furthermore, a method for incorporating radiative heat transfer at the microscale is implemented and applied on a synthetic sample, demonstrating the influence of thermal radiation on the effective thermal conductivity. Ein Vorhersagemodell für die Wärmeleitfähigkeit poröser Bausteine. Ein 3D-Modell zur Vorhersage der effektiven Wärmeleitfähigkeit poröser Bausteine wird vorgestellt. Simulationen werden direkt in der Mikrostruktur mittels Voxel-Bildern und Finite-Elemente-Methode durchgeführt. Sehr gute Übereinstimmungen mit analytischen Verfahren werden erreicht. Das Modell wird verwendet, um die Fehlberechnungswirkung von 2D-Simulationen zu untersuchen, welche klar das Erfordernis eines 3D-Modells zeigen. Zudem wird eine Methode zur Einbeziehung strahlungsgebundener Wärmeübertragung im Mikrobereich umgesetzt und auf einen synthetischen Prüfkörper angewandt. Dies zeigt den Einfluss von Wärmestrahlung auf die effektive Wärmeleitfähigkeit.
Source:	Bauphysik 38 (2016), No. 6
Page/s:	340-347
Language of Publication:	English

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