Hello,
I'd like to know where I could find details about the assumptions taken in TRNBUILD/TRNFLOW to compute the air density is a room (or in a TRNFLOW link). None of the outputs give this information (if I'm not mistaken!), and all flow rates are expressed in kg/h.
Furthermore, if I try plotting the TRNFLOW output "ACHZ" for on zone in a very simple test model (external node --> duct --> zone --> fan ---> external node), to get an idea of the volumetric flow rate, i got zero value (although other indicators, such as FLNEL show me coherent mass flow rate).