Paper Conference

Proceedings of Building Simulation 2011: 12th Conference of IBPSA


Numerical Investigation Of Heat And Mass Transfer In Flax And Hemp Concrete Walls

Chadi Maalouf, Le Anh Dung Tran, Michèle Quéneudec T'kint

Abstract: The purpose of this paper is to study heat and mass transfer in two vegetal fibre materials: flax and hemp concrete which are known to have a low environmental impact. After presenting each of these materials and their physical properties, we present equations of the coupled heat and moisture transfer within simple layer walls. In this model, moisture transport phenomenon is made through liquid and vapour phases. The liquid phase is supposed to move by capillarity whereas the vapour phase diffuses under vapour partial pressure gradient. Simulations are done with the simulation environment SPARK suited to complex problems. In this case, we investigate the impact of moisture transfer on heat diffusion within these two materials through the study of the damping effect, time lag and heat conduction loads and moisture transfer through a simple layer wall subjected to periodical variation of outdoor conditions.
Pages: 278 - 285