Renovation Towards NZEB with PV
Abstract
A typical residential building from 1937 located near Wuerzburg,Germany undergone deep energy renovation in 2013. A balanced ventilation system with integrated air-to-water heat pump was installed together with an 8 kW PV system (roof-integrated). The key performance indicators were measured over a period of seven years (2014-2020). Energy production, energy use, self-consumption and exported electricity to the grid were monitored. The results show variations in performance indicators. The self-consumption varied between 16.9% and 25% while the level of autarchy varies between 34.1% (2014) and 45.4% (2020). The robustness of the key performance indicators is discussed and recommendations for designers and planners as well as prosumers are given.