Quantification of safety factors for simplified heating and cooling demand calculation methods for Vienna |
| |
Authors: | Mario Sofic Azra Korjenic Thomas Bednar |
| |
Affiliation: | (1) OTB Research Institute for the Built Environment, Delft University of Technology, Jaffalaan 9, 2628 BX Delft, The Netherlands;(2) The Hague University of Applied Science, The Hague, The Netherlands |
| |
Abstract: | The method used in Austria for calculating building heating and cooling demand is a monthly quasi-steady-state calculation.
This method is presented in the European draft ISO/FDIS 13790. The simplified monthly calculation method is based on utilization
factors. For these factors there is no specific mathematical derivation. The factor is based on an empirical formula. For
increasing the practicability of the simplified calculation methods, the precision of the method is important, as well as
the prediction accuracy by modifying the building parameters. Both requirements for a simplified calculation method are verified
in this investigation. A simplified investigation of the calculation method precision for the cooling demand for offices leads
to a 40 percent margin of error when using the simplified method for Vienna climate. The prediction accuracy of the monthly
balanced method for changing the building parameters was verified for a six zone office model. At the end, the precision of
the simplified method was quantified for an office model for the heating and cooling demand. Safety factors for the simplified
method resulted from the investigation of the office model. The imprecision of the simplified method is greater than the validation
of the monthly calculation method, as is exposed in the draft ISO/FDIS 13790. 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 no safety factor is necessary
if the simplified method is not used for low air change rates and uncoupled models. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|