Energy performance analysis of an NZEB - The Danish case in the PRELUDE Project

This thesis focuses on the research and analysis of a real case study in Denmark. The house in question is part of a European project called PRELUDE (Prescient building Operation Utilising Real Time data for Energy Dynamic Optimisation) and represents a building with high-level technological solutions. The building is classified as an NZEB (Nearly Zero Energy Building) for its energy performance and use of renewable energy resources. These types of buildings, despite being equipped with many energy efficiency solutions, do not perform as expected, and they often demonstrate the highest energy performance gap. So, thanks to measurements and modelling, it could be possible to know whether the selected buildings underperform and to identify the most impactful parameters. Within this general framework, this study therefore sought to take a step towards reducing the possible energy performance gap in the building by analysing the behaviour from various points of view. Initially, the Be18 model was created. This software is a calculation programme used to document whether a building complies with the energy framework of building regulations and thus identify the position of the house in terms of primary energy requirements. This analysis made it possible to compare theoretical performance with actual performance and to check whether there were any major differences. Then the data measured over the past four years were analysed and compared in order to check the efficiency of the systems in operation and to identify possible faults. This also allowed to understand the differences in user behaviour and how this affects energy consumption. Finally, a model of the building was created, with the Design Builder software, to obtain its dynamic simulation in order to reproduce its complex behavior. A reproduction of it can help to understand the consequences of any change in the setpoint and control of the house.