The influence of daylighting in buildings with parameters nZEB: application to the case study for an office in Tuscany Mediterranean area

The paper deals with the analysis of the contribution of consumption for lighting (EPL) on the global energy consumption, in the case study of the office "Building 5A" by the Italian Heat Technology Committee, to which the reference values nZEB for thermal transmittance and solar control were applied. The case study is located in central Italy, where Florence has an appropriate a significant climate for the aim of the research. The analysis highlights that it is fundamental to use daylight control systems to reduce the energy need both for lighting and for total consumption if we want to achieve the nZEB standard. Improving the use of daylight in buildings results in an energy saving strategy because lighting accounts for approximately from 6 to 46 % of the global electric energy consumption, in accordance to researches on this topic. Results cannot be used to provide general solutions; however, they are useful to highlight the importance of the reduction in lighting usage and of the integration of daylight with electric light