AirFlow Network Window/Door Opening

edit

In the AirflowNetwork:SimulationControl object, the AirflowNetwork Control input field is set to NoMultizoneOrDistribution. This effectively turns off AirFlow Network (AFN), even if you have AFN objects defined in the input file (see below).

AirflowNetwork:SimulationControl,
  AirflownetworkSimulation,!- Name
  NoMultizoneOrDistribution,  !- AirflowNetwork Control
  SurfaceAverageCalculation,  !- Wind Pressure Coefficient Type
  OpeningHeight,           !- Height Selection for Local Wind Pressure Calculation
  LowRise,                 !- Building Type
  500,                     !- Maximum Number of Iterations {dimensionless}
  ZeroNodePressures,       !- Initialization Type
  0.0001,                  !- Relative Airflow Convergence Tolerance {dimensionless}
  0.000001,                !- Absolute Airflow Convergence Tolerance {kg/s}
  -.5,                     !- Convergence Acceleration Limit {dimensionless}
  ,                        !- Azimuth Angle of Long Axis of Building {deg}
  1,                       !- Ratio of Building Width Along Short Axis to Width Along Long Axis
  No,                      !- Height Dependence of External Node Temperature
  SkylineLU;               !- Solver

To use AFN to model window openings, you should change the AirflowNetwork Control input field to MultiZoneWithoutDistribution if you DO NOT want AFN calculations for HVAC systems (duct leakage, etc.). If you want AFN calculations for HVAC systems, then you should set this input field to either the MultiZoneWithDistribution or MultiZoneWithDistributionOnlyDuringFanOperation options instead.

Once you make this change and "turn on" AFN, I would recommend using the EMSAirflowNetworkOpeningControlByHumidity.idf example file as a reference in case there are warnings and errors related to AFN.