Evaluation of the thermal performance of an innovative prefabricated natural plant fibre building system

Andrew D Shea, Katharine Wall, Pete Walker

OAI: oai:purehost.bath.ac.uk:openaire_cris_publications/55812612-b5a9-4c3c-9f26-913e3d1797b8 • DOI: https://doi.org/10.1177/0143624412450023

Energy efficient new and retrofit building construction relies heavily on the use of thermal insulation. A focus on the environmental performance of current construction materials with regards to both embodied energy and energy in-use has resulted in a growing interest in the use of natural fibre insulation materials. The results of heat flow meter thermal conductivity tests on a range of straw samples of different densities are presented. The innovative use of straw in the development of a prefabricated straw-bale panel and the results of guarded hot-box testing are presented. In common with most building materials, there is a degree of uncertainty in the thermal conductivity due to the influences of temperature, moisture content and density; however, from evaluation of a range of the literature and experimental data, a value of 0.064W/mK is proposed as a representative design value for straw bales at the densities used in building construction. Computer simulation and experimental testing suggest that the overall heat transfer coefficient (U-value) for the complete prefabricated panel is approximately 0.178W/m2K. This article also briefly discusses the use of this innovative unit in a highly instrumented test building constructed at the University of Bath.