Lüftung in Wohngebäuden: Ein Vergleich verschiedener Berechnungsmethodiken im Rahmen des EPBD

The legal background for the assessment of the energy performance of buildings and energy certificates in Germany will be changed in October 2009. Beside the tightening of the requirements by about 30%, a significant change will be made at the calculation of residential buildings. Up to now the calculation has to be performed by using the so-called simple approach (EN 15603) by applying the outdated European standard EN 832 in combination with the European Standard EN 14335 with national boundary conditions. From October the calculation can also be performed according to the so-called holistic approach (EN 15603) by applying the DIN V 18599, the German standard application of the EPBD related CEN standards from the EU mandate 343. The DIN V 18599 differentiates the calculation into mechanical ventilation, natural ventilation by opening the windows and ventilation due to infiltration through leakages. That means that the energy effort in residential buildings for ventilation cannow be considered in a much more detailed level. In this paper two typical residential buildings are calculated with various configurations of the ventilation system. This might be as well a mechanical ventilation system with heat recovery but also only naturally ventilated buildings. This work will give an overview, whether the energy performance and especially the energy for ventilation are significantly different, when calculated with the two standards