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Getting started with ventilation simulation in OS

Dear all,

I am a (very new) research staff in agricultural engineering field and want to simulate energy balance of greenhouses.

Currently, I am trying to model very simple greenhouse with natural ventilation. With OpenStudio, I set natural ventilation to "Zone Equipment" in "Thermal Zones" and ran the model. However, it seems that there was no ventilation as it is shown in results (I checked the Zone Ventilation Total Heat Loss Energy).

The description of the model is like; with one thermal zone and two windows, using weather data downloaded from E+ webpage (Tokyo), without anything set in the space.

I would like to know what is the possible solution for this.

Best regards,