Evaluation of the energy consumption of an educational building, based on the UNI EN 15193–1:2017, varying different lighting control systems

Nowadays, it is well-known the importance of reducing the CO2 emissions, through several interventions for retrofitting and renovating the entire building sector. In line with this, this work is focused on the building lighting sector, which accounts for about 20% of the total electricity consumption of the construction industry. In the standard UNI EN 15193–1:2007 “Energy performance of buildings-Energy requirements for lighting”, different LENI (Lighting Energy Numeric Indicator) calculation methods for assessing the energy consumption of artificial lighting are available. A new software LENICALC, developed by ENEA (Ente per le Nuove Tecnologie, l'Energia e l'Ambiente), based on this standard, allows users to calculate LENI values for a specific building. In this framework, the authors analyzed an educational building to understand the impact of daylight and occupancy lighting system controls and the combination of them on the final lighting consumptions. Simulations are carried out with the LENICALC tool. Results highlight that a balanced combination in the use of the two types of lighting control systems allows to obtain higher energy savings compared to the use of both efficient control systems.