Il comportamento termoigrometrico degli edifici in legno nel clima Mediterraneo

In Sardinia timber and particulary cross laminated timber (CLT) are starting to be used for buildings due to their excellent properties and speed of execution. But timber is not a traditional material for wall in Sardinia and the climate (very wet but also very hot in summer) brought about many questions in designers. In this work dynamic hygrothermal simulations are performed by the use of WUFI software (Wärme und Feuchte Instationär – transient heat and moisture) developed by Fraunhofer Institute for Building Physics (IBP) and demonstrated that CLT is suitable in weather conditions of Sardinia. The commercial research software (WUFI PRO 5.3) was used to calculate heat and moisture transfer through 7 different walls and 7 types of roof in Cagliari, Oristano, Nuoro and Sassari due to their climatic conditions. The results show that there are no risks of surface or interstitial condensation and hygrothermal conditions inhibit mould growth. In the second part the research shows the project of a family house and townhouses in Cagliari using ProCasaClima software. ProCasaClima 2013 software was used to calculate heating and cooling in the buildings and thermal comfort for the occupants. The buildings observe Italian regulations on energy efficiency but in order to obtain a “zero energy building” and to increase thermal comfort passive design strategies must be applied. These strategies are not the same for all the Italian climates. In Cagliari the most effective strategies to reduce the need for cooling are: shading elements to avoid summer sun, night ventilation of thermal mass, areal heat capacity and light colours for building envelope. The research shows that also in Sardinia a building in CLT can reach high thermal performance and can provide comfort to its occupants.