Methodology for energy rehabilitation of office building

In this paper, a methodology has been described for energy consumption assessment and rehabilitation of an office building. The initial activity is focused on the evaluation of office buildings energy reference consumptions at EU and national level, in order to quantify the saving potential related to rehabilitation strategy on this sector. Subsequently, the work has focused on the assessment method regarding energy consumption for different energy uses in order to identify the energy classification level according to the present Italian building energy standards implemented under EPBD (European Directive on Energy Performance of Buildings). In particular, the first phase is related to the analysis of building envelope components and the systems for energy supply. Further a detailed analysis has been proposed on the measured (actual) energy consumption based on the actual energy bills. The results have then been compared with the estimated primary energy demand for different energy uses, performed by computer simulations of building through software calculations in dynamic regime. The final stage of the method, therefore, identifies the possible interventions (different scenarios) for energy rehabilitation on building envelope and energy systems and controls. Finally, the proposed methodology has been applied on a case-study office building, and different rehabilitation strategies have been proposed for the improvement of the energy performance of the building.