Hybrid System for Reducing Operational CO2 Emissions Generated by Technical Systems in Tertiary Buildings

To achieve climate neutrality by 2050, new buildings, but also approximately 75% of the existing building stock in the EU, must begin the transition process towards decarbonization. The article models, analyses, develops and experimentally tests a hybrid technical system that provides heating, cooling and hot water for an educational building located in Timisoara, Romania. The hybrid system was designed by the authors to integrate renewable technologies for reducing operational CO2 emissions generated by technical systems in tertiary buildings. The hybrid system can provide, by PV system, 17.94% of hot water and heating agent for the winter season, and 78.61% of hot water and chilled water for building cooling in the summer season. The results obtained show a decrease in electricity consumption from the national energy system of 2.5 MWh. In terms of operational CO2 emissions, there was a reduction of 84.47% when compared with the classic system in which the building was connected to the city’s centralized system, which is currently dependent on fossil fuels (a coal and gas addition of approximately 10–15%).