[Zurück]

M. Sofic, A. Korjenic, T. Bednar:
"Safety Factors For Simplified Calcualtion Methods Of Heating And Cooling Need Of Buildings";
Vortrag: International Conference: Informatics and Ecology,, Bielsko-Bia322;a, Polen (eingeladen); 14.09.2013 - 15.09.2013; in: "Proceedings of the International Conference Informatics and Ecology", (2013), ISBN: 978-83-62466-20-7; S. 105 - 122.

The method which is used in Austria for calculation of heating and cooling demand of buildings is a monthly calculation quasi-steady-state method. This method is presented in the European draft ISO/FDIS 13790 [ISO07]. The simplified monthly calculation method based on utilization factors, for these factors there is no specific mathematical derivation.
For increasing the practicability of simplified calculation methods on the one hand the precision of the method is important on the other hand the prediction accuracy by changing the building parameters is fundamental. Both demands for simplified calculation method are verified in this work. A simplified investigation of the precision of the calculation method for the cooling demand for office boxes, leads to an imprecision of 40 percent of the simplified
method for Vienna [ANA07]. The next step was the systematically study of a six zone model which is used as an office [STR08]. For this model the prediction accuracy of the monthly balanced method for changing the building parameters was verified. At the end the precision of the simplified method was quantified for an office model for the heating and cooling demand for Vienna. The results of the investigation of an office model are safety factors for
the simplified method. The imprecision of the simplified method is higher than the validation of monthly calculation method, as in the draft ISO/FDIS 13790 [ISO07] is exposed. For the cooling demand for Vienna the safety factor is 1,25 for the one zone method and 1,15 for the multi-zone method. For the heating demand there is no safety factor necessary, if the simplified method is not used for little air change rates and uncoupled models.