In a
dynamic simulation (EnergyPlus) I have to model a ventilated crawl space, like
that one in the picture http://www.ferracinsrl.it/en/vespaio4s.php

The heat
transmission through the floor is therefore influenced also by the ventilation
in that system. Have you ever modeled such a system? Should I consider as floor construction only the layers over the ventilated
crawl space and as temperature an average value among monthly air temperature,
internal temperature and ground temperature?

Best
Regards

Francesco
Passerini