context in order to find out how the cost optimal energy performance outcomes are vulnerable to uncertainties of several economical input data as influential parameters of building lifetime cost calculation . Its focus is to monitor the variations in achieved results to illustrate their sensitivity to uncertain economic parameters . Firstly , an Italian representative apartment building model was simulated with twenty two different wall envelope technologies and then by means of global cost calculation , the cost-optimal solution was found out . In particular , crucial economic parameters which have the highest influence on the global cost calculations are investigated in order to look at the effects of their variation in a specific range on global energy performance related cost results .
Methods
The entire procedure of this study relies on four main steps ; defining envelope technologies for the reference building ( RB ), simulating and obtaining the energy needs , performing cost optimal calculation to find out life cycle present value of cost and as the final phase , analyzing deviation of cost optimal solutions versus uncertainties in financial parameters .
Reference building
European Directive EU No 244 / 2012 requires investigation of cost optimal nZEB energy performance level to be performed on different building categories ; single-family houses , apartment blocks and multifamily buildings , office buildings and other non-residential buildings . The chosen RB is a sample of social housing built by ACER ( housing service of region Reggio Emilia ) in 2005 with energy consumption of slightly more than 70 kWh / m2yr . This RB properly represents a typical Italian condominium with constructive characteristics of Mediterranean area such as walls and attic made of brick . Summary of main geometrical and constructive properties of the building is presented in Table 1 and Table 2 respectively . Brick structure applied in the RB guarantees its compatibility with typical Italian traditions in construction methods .
Figure 1 : Isometric view of analyzed building
78 ZEMCH 2015 | International Conference | Bari - Lecce , Italy