Free cooling - natural ventilation - macro flow

[simonemiri3]

Hi,
I'm new of this kind of argument,
I'm modelling a multifloor office building with a big central empty zone with openable windows on the roof and on the ground floor.
On vista I can find three different categories:
- Free cooling
- Natural ventilation
- Macro flow ventilation
What's the difference between this?
What's the correct way to simulate Free cooling in a temperature range?

thanks,

Simone