Vereinfachtes Flächenerfassungsmodell für Mehrzonenbilanzen

A simplified surface area calculation and zoning model for energy performance assessment of buildings

According to the DIN V 18599 energy performance assessment, buildings have to be divided into zones depending on their utilisation. The same zoning applies to the building envelope where the segments are being allocated to the individual zones. In engineering practice about 50% of the work is required for zoning, calculating surface areas and evaluating the properties of building envelope components. In order to reduce the time needed for these efforts a methodology similar to the single zone model has been developed. To carry out the multiple zone calculation the building envelope is being split and allocated to the individual zones in a simplified way. This as well provides a significant advantage for the dimensioning and optimisation of the related HVAC and lighting systems. Within the simplified calculation, the allocation of the building envelope is carried out in dependence of the zone size and corrected with a weighting factor if needed. The analysis of several buildings has shown that the simplified method can be applied with sufficient accuracy. The weighting factors are however necessary. By implementing this simplification the time expenditure to calculate a building is reduced by more or less 30%. This reduction tends to be even more important when dealing with complex buildings which have a high number of zones. The methodology enables building components to be edited by zones and hereby gives the opportunity to easily modify the design during the course of the planning. As the project develops, the calculations can be more detailed thereby increasing the precision of the calculation. In the near future this methodology will be implemented in the Luxembourg energy saving ordinance (EnEV) for the energy performance assessment of non residential buildings.