Residential building rehabilitation in Porto historic center: Case study analysis by using a simulation model

Nowadays, rehabilitation in historic centers can become a challenge due to the restrictions concerning requirements for building envelope. Portugal has conducted studies define maximum U values [W/(m2 K)] single components based on indoor temperature. Despite relative humidity being crucial thermal comfort, current Portuguese scheme energy certification of buildings does not consider it. Additionally, it is essential know that most dwellings are fleet-float regime cultural habits and poverty. Therefore, increasing insulation thickness exterior walls might have relevant impact There even risk harming authenticity built heritage. Using calibrated dynamic simulation model developed with TRNSYS software, we found that, winter, effect external wall temperature tiny. Results suggest be over-defined. Further cost-optimal levels should models free-float this type buildings.