applying Night time purging or free cooling

[pascali]

Hi,

I am getting high number of hours( Range temp >25deg) after Dynamic simulation range test. I have profiled all the external window opening same as occupied hours for macro flow. The hours came down well. There are Still high number of hours. It may improve if I can model the windcatcher or fan and use it for free cooling. My question is how would I assign night time purging or free cooling in the systems. I am able to profile it with a formula but where do you have to put fig i.e 1 ach or l/s? is there a way to check it that it has been applied?
Any suggestion to overcome the Range temp >25deg hours for natural ventilation would be very helpful.

Pascali