Improvement of the Energy Saving of a House With Biosourced Materials Walls (Rice Husk-Cement) by a Judicious Choice of Its Thickness

Abstract

This document has two essential parts: a first part which summarizes a comparative study of thermal retention capacity of some local materials of common construction. At the end of this study, a classification is made, followed by a case study of economic energy gain. The second part, offers a thorough analysis of the best material according to the previous classification in terms of the effect of its thickness on its thermal and economic performance. In this context, five samples of rice husk composite materials are manufactured at thicknesses of 7.5; 10; 12; 15 and 20 cm. They are kept in the laboratory (LEMA) for 1 month. They are then wrapped in glass wool, instrumented and exposed for five days to solar thermal solicitations. Flow and temperature data are collected and processed. Curves of phase shift and damping variations as a function of the thicknesses are plotted.The analysis of the data processing and the interpretation of the curves shows that the increase in thickness improves the damping and the phase shift of this material and consequently a saving of energy necessary for the comfort of a building. We note a maximum to this evolution, which shows that beyond a certain value of the thickness these parameters do not evolve anymore.