Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
If you have roof surfaces, then the problem is likely that E+ is not identifying them as roof surfaces. The coefficient curves are generated and then the surfaces are connected to the curves (via generated external node objects). The code that does all that is in AirflowNetworkBalanceManager.cc (look at the CalcWindPressureCoeffs routine). If you have tilted roof surfaces then those surfaces may be identified as walls rather than roofs. The "SurfaceAverageCalculation" approach uses a flat roof correlation, so that restriction is pretty much required.
Have you tried using "Input" instead? That will require defining the external nodes yourself, so it is more work, but would also help determine if there is something else going wrong.
