Design method of high performance precast external walls for warm climate by multi-objective optimization analysis
CHALLENGE - Taking into account global environmental problems, there is an urgent need to reduce energy consumption and greenhouse gas emissions in the construction sector. This can be done through the application of precast systems in buildings construction. This study aims at identify energy-efficient precast walls for Zero Energy Buildings and reveal the position of layers for some eco-friendly materials.
SOLUTION - modeFRONTIER, with the use of computational procedures developed in Matlab, was used to assess the thermal dynamics of building components. The construction materials have been selected considering the optimum balance between energy performance and environmental impact, avoiding the formation of thermal bridges and moisture during assembly. In modeFRONTIER, the correlation is carried out between five input variables (5 layers of the precast wall) and twelve output variables (9 thermal properties, the commercial thickness, sustainability score and costs). Objective functions include minimization of decrement factor, periodic thermal transmittance, static transmittance and maximization of internal areal heat capacity, thermal admittance, time shift and eco sustainability score.
BENEFITS - The results illustrate that it is possible to obtain high performance precast multi-layered walls of a thin, light nature. Using MOGA-II algorithm in modeFRONTIER coupled with Matlab, best configurations of precast walls for warm climate are shown to have low decrement factor and several configurations show a very low number of layers, high performances and low cost.