Paper No. 651: Towards Zero Energy Renovation: Ex-Post Building in Bolzano/Italy

For the relocation of the Environmental Department in Bolzano/Italy the three-storey ex-post building was enlarged with two storeys and refurbished with the goal to reduce heating demand from 200 to 7 kWh/m²a. The envelope with small, regular window was refurbished as an ETIC system with 35cm of EPS-insulation. The window reveals were used for an aesthetically charming and at the same time functional solution, which enlarges lateral views and optimises daylighting and shading. This gives the facade a distinguished and lively appearance. The HVAC system guarantees optimum air quality also with closed windows (noise due to railway station and through road), whereas in each office the air can be thermally post-treated in order to take account of different locations and orientation. A green roof provides valuable unsealed surface in the city centre and mitigates summer climate in the last floor. The SE-facing staircase is covered with photovoltaic panels (26.7 kWp). A monitoring system, registering heat, electricity and gas consumption for different floors and zones and discriminating electricity demand for different uses, allows not only to verify the overall performance, but also to analyse the influence of parameters as location, orientation and user behaviour. Evaluations of energy consumption, indoor temperature and humidity have been carried out and show satisfying results. Energy consumption is slightly above the design values but some optimisation measures could already be identified.