Energy Analysis of a Residential Building: From Theoretical to Actual Consumption and Assessment of Energy Retrofitting Scenarios.

The energy efficiency of buildings plays a fundamental role in the global strategy to reduce energy consumption and greenhouse gas emissions. With buildings accounting for nearly 40% of total energy consumption in the European Union, improving their efficiency is essential for achieving climate goals and fostering sustainable development. This study focuses on the energy performance assessment and optimization of an existing old residential building, located in Ancona, by using the software Edilclima. In the first chapter the main regulations related to energy efficiency of buildings have been examined, starting with the European ones, and then discussing the Italian directives. Then, in the second chapter, the calculation software, and its main features have been examined. In the third chapter a digital model related to the existing building in Ancona has been created and then validated through a comparison between the estimated consumptions and the real ones, obtained from the energy bills. This validation phase has been conducted considering four different years. Then, in the fourth chapter, five energy retrofit interventions have been simulated in the software, examining their impact on the energy performance of the building and considering also the payback period of the investment. Furthermore, in the fifth chapter, the potential of Renewable Energy Communities (RECs) has been explored, analyzing the economic and environmental benefits of collective self-consumption. The simulations using the GSE platform highlighted that an energy-sharing approach can maximize savings and promote a more sustainable energy model.