The recent worldwide environmental issues impose to decrease the energy consumption and the greenhouse gas emissions from the construction sector. To improve productivity and to decrease the negative effects on the environmental and social activities, particular attention is placed on precast systems. A multi-objective analysis has been carried out in order to identify high energy efficiency external walls for Zero Energy Buildings (ZEBs) in warm climate, encouraging eco-friendly building materials. The definition of the external walls for Mediterranean climate has been carried out through the integration of a multi-criteria optimization. ModeFRONTIER rel.4.3 environment has been used with calculation procedures to evaluate the dynamic performance of building components developed in MatLab rel.7.0 environment. The optimization has been carried out in terms of steady thermal transmittance, periodic thermal transmittance, decrement factor, time shift, areal heat capacity, thermal admittance, surface mass, small thickness, eco sustainability score, light-weight and costs. The results shows the possibility to reach high energy performance with light and thin solutions, considering the superficial mass and the internal areal heat capacity. The best solutions present repetitive features: high surface mass for the first layer (internal side), eco-friendly insulating materials for the middle layers and common insulating materials for the outer layer. The aim is to show a method to design high efficiency precast external walls of new low-cost residential buildings among which the designers can choose the proper solution for his application, according to the Pareto front of the multi-objective problem.
SELECTION OF HIGH PERFORMANCE PRECAST EXTERNAL WALLS FOR ZERO ENERGY BUILDINGS BY MULTI-OBJECTIVE OPTIMIZATION ANALYSIS
BAGLIVO, CRISTINA;CONGEDO, Paolo Maria;LAFORGIA, Domenico
2015-01-01
Abstract
The recent worldwide environmental issues impose to decrease the energy consumption and the greenhouse gas emissions from the construction sector. To improve productivity and to decrease the negative effects on the environmental and social activities, particular attention is placed on precast systems. A multi-objective analysis has been carried out in order to identify high energy efficiency external walls for Zero Energy Buildings (ZEBs) in warm climate, encouraging eco-friendly building materials. The definition of the external walls for Mediterranean climate has been carried out through the integration of a multi-criteria optimization. ModeFRONTIER rel.4.3 environment has been used with calculation procedures to evaluate the dynamic performance of building components developed in MatLab rel.7.0 environment. The optimization has been carried out in terms of steady thermal transmittance, periodic thermal transmittance, decrement factor, time shift, areal heat capacity, thermal admittance, surface mass, small thickness, eco sustainability score, light-weight and costs. The results shows the possibility to reach high energy performance with light and thin solutions, considering the superficial mass and the internal areal heat capacity. The best solutions present repetitive features: high surface mass for the first layer (internal side), eco-friendly insulating materials for the middle layers and common insulating materials for the outer layer. The aim is to show a method to design high efficiency precast external walls of new low-cost residential buildings among which the designers can choose the proper solution for his application, according to the Pareto front of the multi-objective problem.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
