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

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

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 wi...

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Bibliographic Details
Published in:Buildings (Basel) Vol. 7; no. 4; p. 11
Main Authors: Costes, Jean-Philippe, Evrard, Arnaud, Biot, Benjamin, Keutgen, Gauthier, Daras, Amaury, Dubois, Samuel, Lebeau, Frédéric, Courard, Luc
Format: Journal Article Web Resource
Language:English
Published: Basel MDPI AG 2017
MDPI
Stamats Communications Inc
Subjects:
Architecture
Architecture, space management
Baling
Buildings
Conductivity
Construction industry
Density
Engineering, computing & technology
environmental impact
Fibers
Heat conductivity
Heat flow
Heat transfer
Heat transmission
Humanities and Social Sciences
Humidity
Ingénierie, informatique & technologie
Insulation
Literature reviews
Moisture content
Straw
straw bale
Thermal conductivity
Thickness
environmental impact
thermal conductivity
straw bale
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Summary: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.
Bibliography:scopus-id:2-s2.0-85014080778
ISSN:2075-5309
0007-3725
2075-5309
DOI:10.3390/buildings7010011