How do I find out when natural ventilation occurred?

grasshopper honeybee-legacy
1

I am trying to understand how Honeybee models natural ventilation through the SetEPAirflow component. Specifically, I would like to know the time frames during which a window was simulated to be open.

I have tried doing this by requesting the output Zone Ventilation Current Density Volume Flow Rate:

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image3789×1273 662 KB

My questions are

  1. Can I assume that every time the Zone Ventilation Current Density Volume Flow Rate is above 0, EnergyPlus is modelling the windows to be open?
  2. If so, does the above graph mean that the windows are always open during occupancy? This would seem unrealistic.
  3. It looks like the ventilation flow rate correlates with the occupancy - why is this the case?
  4. It also looks like the outputs are shifted by 3 days, i.e. the the time frames of weekends seem to occur at different times when comparing the occupancy schedule and ventilation output. Have I made a mistake?

WindowStates.gh (576.1 KB)

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