The new EN 15193-1 to calculate the energy performance for lighting in buildings: analysis and application to reference building types

The standard EN 15193 is part of a set of standards developed to support the implementation of EPBD directives. The EN 15193 provides a simplified method for the estimation of the energy consumption for lighting through the index LENI. The calculation method introduced in the original standard (2007) has been revised in 2017, especially on the approach to calculate the daylighting contribution. In this paper calculation method of the LENI is analysed and the results obtained for a reference buildings, representative of the Italian building stock, are presented. The LENI values found for the building stock were then compared to the LENI of four retrofitting scenarios, based on different combinations of relampling with LED systems, use of dimming sensors and automated shades. All together, these interventions allowed a reduction in the energy consumption for lighting up to -58.1% compared to the existing buildings.