ENERGY PERFORMANCE ANALYSIS OF BUILDINGS IN THE 5TH MUNICIPAL COMMUNITY OF THE MUNICIPALITY OF ATHENS

Abstract

The subject of this diploma thesis is the extensive energy performance analysis of 45 municipal buildings, covering 100% of the relevant infrastructure in the 5th Municipal Community of the Municipality of Athens. Applying a comprehensive and technically documented methodology, based on the specifications of a Building Energy Efficiency Plan (BEEP / ΣΕΑΚ) and fully aligned with European and national regulatory frameworks (EPBD, EED, NECP, Law 4843/2021), the study aims at drastically improving efficiency and contributing to climate neutrality. The baseline assessment was achieved through the combined utilization of data from the Athens Energy Portal digital platform and the execution of comprehensive on-site energy audits (site visits). This field research accurately bridged the "performance gap" between theoretical design and actual operating conditions. For the rational prioritization of upgrading needs, a Multi-Criteria Decision Analysis (MCDA) method was applied, equally combining energy (specific and total consumption) and non-energy criteria (building age, number of users, useful area). Based on the results, the proposed interventions include: external thermal insulation of the envelope and roof, installation of new

energy-efficient double-glazed windows, radical replacement of old oil boilers with modern, high- efficiency Heat Pumps, lighting upgrades using LED technology, integration of Building Energy

Management Systems (BEMS), and the installation of Photovoltaic (PV) stations for self- production via virtual net billing.

An integral part of the thesis was the comparative evaluation of the developed methodology against the central BEEP of the Municipality of Athens (Chapter 11). The comparison highlighted the methodological complementarity of macro-level strategic planning with specialized micro-level local analysis. It was demonstrated that implementing Deep Renovation ensures maximum thermal protection, prevents heat losses, and transforms public buildings into active clean energy producers (Net-Exporters). The quantitative assessment of the measures revealed a total annual energy saving of approximately 2,095,439 kWh, achieving the complete elimination of emissions from heating fossil fuels. The techno-economic evaluation over a 25-year time horizon confirmed the macroeconomic viability of the investments, as 29 out of the 45 buildings exhibit a positive Net Present Value (NPV). Finally, a ten-year implementation roadmap (Gantt chart) was formulated, accompanied by a monitoring plan, user behavior change initiatives, and an ISO 50001 certification strategy.