How heat waves influence indoor temperature during summer in old renovated parisian buildings.

Energy saving policies in the building sector in France have resulted in the implementation of thermal insulation to reduce energy consumption during winter. Nevertheless, old buildings in Paris were built with uninsulated thick walls made of porous materials with high thermal inertia, this property could be affected by the installation of the insulation. Furthermore considering that heat wave periods could become more frequents in future weather, indoor conditions could become intolerable. The thermal measures in old residential buildings must be then assessed. The aim of this study is to evaluate through a thermodynamical model the behavior of two old apartments in Paris, renovated with internal and external insulation. Thermal simulations were performed in EnergyPlus with real and hypothetical weather data of Paris (2 scenarios). Results highlight the impact of thermal isolation position on the thermal behavior of old renovated buildings in summer with indoor temperatures that could reach 28°C.