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Dr. Nabila Ihaddadene

Departement of mechanical engineering, M’Sila University, Algeria


Talk Title
Study of the thermal conductivity of clay-based building materials

Talk Abstract

Local clay materials have been widely used in the construction of buildings in North Africa. The thermal comfort is well ensured inside without having recourse to the installations neither of heating nor of air conditioning (building with the lowest energy consumption). This study deals with the determination of the thermal conductivity of these clay-based materials. For this, a type of clay from an agricultural region was used to which straw was added in different quantities. The ratio of the mass of the clay to that of the straw R is the criterion used in this investigation to study the effect of the addition of straw on the thermal properties of the clay and straw mixture. Five samples were studied namely R=20, R=40, R=50, and R=60 in addition to that without straw. The samples were obtained by drying in the sun the manageable paste made of clay, straw, and water. The estimation of the thermal conductivity was based on the analysis of transient temperature measurement (0 to 180s) of heating films placed between two identical samples of the material to be tested. The clay with and without straw present a thermal anisotropy as the thermal conductivity measured in the longitudinal direction is significantly different from that measured in the transverse direction (p <0.05). These samples are more conductible in the longitudinal direction than in the transverse direction. The addition of straw to the clay reduces its thermal conductivity and this reduction depends on the amount of straw added. Indeed, the thermal conductivity of a clay mass of m kg is reduced by more than 50% (in both directions) by adding a straw mass of m/20 kg (more straw). The thermal conductivity of the same mass is reduced by more than 30% (in both directions) by adding a straw mass of m/60 (less straw). The conductivity measurement direction and the amount of straw added have a significant effect on the thermal conductivity of the mixture made of clay and straw (p<0.05). In fact, the mass of straw added to the clay to make bricks used in construction presented one-twentieth of the mass of clay, this study confirms that the people of North Africa were right in their choice.

Short Biography

Associate Professor at the University of M'Sila in 2014, Chair of the Scientific Committee of the Department of Mechanical Engineering at the University of M'Sila, Head of Research Team at the Laboratory of Renewable Energy and Sustainable Development (LRESD) affiliated to Mentouri Brothers University of Constantine, Algeria. She received the PhD Degree in Biomechanics, from Ferhat Abbas University, Sétif (Algeria) in 2009. She received M.S. Degree in Engineering Process from Polytechnic Military School (EMP), Bordj El Bahri, Algiers (Algeria) in 2001. Member of the reading committee of the International Congress of Renewable Energy IREC (Tunisia). She published in peer-reviewed journals including International Journal of Hydrogen Energy, Journal of Solar Energy Engineering, Energy Conversion, and management. Her research interest focus on renewable energies, thermal buildings, nutrition, medicinal plants and the well-being of the living.

Talk Keywords
Clay, straw, thermal conductivity, heating films.
Target Audience
Students, Post doctoral, Industry, Doctors and professors
Speaker-intro video

The International Conference on Innovative Applied Energy (IAPE’18)