ÂRecently I am doing Natural Cross Ventilation Simulation.I input:Room Air Model Type= cross ventilationRoom Air Setting=Cross Ventilation (Recirculation)Zone Air flow > Zone Ventilation Design Flow Rate.but the following errors ...****Program Version,EnergyPlus-Windows-64 8.1.0.009, YMD=2016.03.02 21:10,IDD_Version 8.1.0.009
  ** Severe ** Problem with RoomAirSettings:CrossVentilation = Z-1
  **  ~~~  ** AirflowNetwork airflow model must be active in this zone
  ** Fatal ** GetAirModelData: Errors found getting air model input. Program terminates.
  ...Summary of Errors that led to program termination:
  ..... Reference severe error count=1
  ..... Last severe error=Problem with RoomAirSettings:CrossVentilation = Z-1Please help to inform the proper steps.
Sajal Chowdhury
B.Arch.(BUET), M.Arch.(BUET), M.Eng.(HU,Japan)C.--
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