Natural ventilation formula

Hi all,

I’m using natural ventilation through the ‘Honeybee_Set EP Air Flow’ component.
Having single sided ventilation, I’m using natural ventilation type 1, and therefore the formula that is being used is:

I’m wondering how the following inputs are accounted for in the above formula:

  • Coefficient Discharge (Cd)
    i can’t see it in the above equation but when I change Cd in honeybee component to a value of (0), I get zeros for air flow from ventilation results and the temperatures increase largely.
  • Fraction of glazing area operable

Also, the Cw (opening effectiveness), is that auto-calculated in honeybee as there isn’t such input to the component?


Hi @mostapha, might need your help here, please :slight_smile: