2 research outputs found
A FEM comparative analysis of the thermal efficiency among floors made up of clay, concrete and lightweight concrete hollow blocks
Thermal performance optimization of hollow clay bricks made up of paper waste
In this paper, the thermal behavior of hollow clay bricks made up of
paper waste has been studied and their thermal performance has been
optimized. On the one hand, both strength and thermal properties of
different paper waste concentrations have been obtained by means of
laboratory tests. Thermal conductivity of the microporous brick
materials with additives produced in this study reduced from 0.68 W/m K
to 0.39 W/m K compared with that of the sample without additives. On the
other hand, the finite element method (FEM) has been applied to the
nonlinear numerical thermal analysis of three different hollow bricks,
including radiation and convection phenomena inside holes. Next, using
the design of experiments (DOE) over the FEM models, several parameters
such as the material conductivity, the convection and radiation
properties and the mean brick temperature have been studied. In general,
the thermal resistance is a nonlinear function that depends on the
geometry of the recesses, the material properties and the temperature
distribution. In all analyzed cases, minimizing the material thermal
conductivity of bricks and decreasing the recesses surface radiation
emissivity caused a lower thermal transmittance in the brick. Finally,
the most important conclusions and the main findings of this research
are exposed. (C) 2014 Elsevier B.V. All rights reserved