Thermal design optimization of lightweight concrete blocks for internal one-way spanning slabs floors by FEM

Characteristics of fired clay bricks with pumice additive

“…The aim is to decrease energy consumption in the buildings for the best thermal protection of the internal enclosure [1]. Buildings today account for about 40 % of energy consumption in developed countries according to the Organization for Economic Co-operation and Development [2]. This represents 36 % of the global CO 2 emissions in the World [3].…”

Nonlinear thermal analysis of multi-holed lightweight concrete blocks used in external and non-habitable floors by FEM

“…(17), as well as the view factors required for finding [K ts ]. In this sense, the view factors in the radiation matrix method are calculated using the hidden method [12,18,19].…”

“…In this sense, it is possible to extend the Stefan-Boltzmann law for a system of N enclosures or recesses, so that the energy balance for each surface in the enclosure for a gray diffuse body [12,15,19], which relates the energy losses to the surface temperatures, leads to the expression:…”

“…In this way, these equations provide the basis for the finite element formulation and solution of this complex heat transfer problem. Consequently, the basic equations of heat transfer are summarized below [12,[15][16][17]. Fig.…”

“…At present, there are some research works that provides a comprehensive treatise on the application of thermal analysis techniques (both experimental and numerical ones) for various types of construction elements applied to walls [4][5][6][7][8][9] and floors [10][11][12][13][14], but nowadays there are not many research papers about the numerical thermal behavior of multilayer floors and, specifically, there are not manuscripts about the thermal influence of the recesses in the multi-holed lightweight concrete blocks to be used in external and non-habitable floors.…”