Study of Heat Transfer in a Kapok Material from the Convective Heat Transfer Coefficient and the Excitation Pulse of Solicitations External Climatic

Abstract

The aim of this study is to characterize thermal insulating local material, kapok, from a study in 3 dimensions in Cartesian coordinate and in dynamic frequency regime. From a study a 3 dimensional the heat transfer through a material made of wool kapok (thermal conductivity: λ = 0.035 W/m/K; density: ρ = 12.35 kg/m 3 ; thermal diffusivity: α = 17, 1.10-7 m 2 /s) is presented. The evolution curves of temperature versus convective heat transfer coefficient have helped highlight the importance of pulse excitation and the depth in the material. The thermal impedance is studied from representations of Nyquist and Bode diagrams allowing characterizing the thermal behavior from thermistors. The evolution of the thermal impedance with the thermal capacity of the material is presented.

Method for Determining the Optimum Insulation Thickness of the Plaster Tow Material: Influence of the Heat Exchange Coefficient in Transient Regime

“…The proposed method is based on the determination of the thermal resistance in the depth of the material for a different value of heat exchange coefficient. We also used the relative thermal resistance that shows how the optimum insulation thickness of the material changes when the heat exchange coefficients change values [5].…”

Characterization Phenomena of Thermal Transfer Through an Insulating Material Kapok-plaster Starting from Dynamic Impedance Method

“…Wool kapok (Dieng et al, 2013) associated with plaster is proposed as insulating useable material in building construction.…”

Study of the Equivalent Electrical Capacity of a Thermal Insulating Kapok-plaster Material in Frequency Dynamic Regime Established

“…From of thermal electrical analogy (Dieng et al, 2013), we study the equivalent capacity of storage of heat.…”