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Thermal Conductivity of Straw Bales: Full Size Measurements Considering the Direction of the Heat Flow

Article dans une revue avec comité de lecture
Author
COSTES, Jean-Philippe
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
EVRARD, Arnaud
92863 Université Catholique de Louvain = Catholic University of Louvain [UCL]
BIOT, Benjamin
491088 Institut de Conseil et d’Etudes en Développement Durable [ICEDD]
KEUTGEN, Gauthier
491088 Institut de Conseil et d’Etudes en Développement Durable [ICEDD]
DARAS, Amaury
93075 Université de Liège = University of Liège = Universiteit van Luik = Universität Lüttich [ULiège]
DUBOIS, Samuel
LEBEAU, Frédéric
COURARD, Luc
93075 Université de Liège = University of Liège = Universiteit van Luik = Universität Lüttich [ULiège]

URI
http://hdl.handle.net/10985/11615
DOI
10.3390/buildings7010011
Date
2017
Journal
Buildings

Abstract

The thermal conductivity of straw bales is an intensively discussed topic in the international straw bale community. Straw bales are, by nature, highly heterogeneous and porous. They can have a relatively large range of density and the baling process can influence the way the fibres are organised within the bale. In addition, straw bales have a larger thickness than most of the insulating materials that can be found in the building industry. Measurement apparatus is usually not designed for such thicknesses, and most of the thermal conductivity values that can be found in the literature are defined based on samples in which the straw bales are resized. During this operation, the orientation of the fibres and the density may not be preserved. This paper starts with a literature review of straw bale thermal conductivity measurements and presents a measuring campaign performed with a specific Guarded Hot Plate, designed to measure samples up to 50 cm thick. The influence of the density is discussed thoroughly. Representative values are proposed for a large range of straw bales to support straw-bale development in the building industry.

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