IES-VE User Forum

Not sure I understand your question, but if you are trying to set minimum Outside air airflow, I do this at the damper to the left of the supply fan graphic. (There's probably a way to do this from within the System Parameters window, but I'm still warming up to that thing personally)
As for ...

I'd set the radiator controller setpoint a couple degrees higher than the VAV reheat, I think this would provide the results you want.

In my experience, VEpro gets very unhappy with unbalanced flows. You'll see "Negative Flow" errors at the effected Nodes when you run simulations on you HVAC networks.

Hope others have a workaround as these errors can be a nuisance when variances in pressures are desired (Often)

Tom

Maybe the CO2 variable could be made to work for your application?

I don't really know the answer to your question, but I'd bet a dollar it's based on Ammonia.

Not sure I understand your question, but I'd simplify the model by modeling a single DOAS system and model the FCU's and VAV's completely separately.
I would Simplify by delivering OA to the space even if it actually is ducted to a return.

I'm seeing the same thing and I'm looking for a solution as well.

It's a shame that support has ignored your post, I really expect more from IES than this.

I've run into the same kind of issue, unfortunately there does'nt appear to be a way to do what you want.

A workaround I've used is (one by one), assign the energy use I'm interested in capturing to the "Parking Garage Fan" fuel usage and document the results. Not ideal, and I don't understand why ...

Hi,

I'm trying to model a space that has an electric unit heater for heating when space temp drops below 68F. The space also has an exhaust fan and dampers to the outside, that turn on/open when the space temperature exceeds 80F.

The network show below seems to work ok except that during "cooling ...

I have a situation where I'm exhausting more air from a zone (170 cfm) than supplying (135), in order to keep the space negative with respect to nearby areas.
When I run a system plant sizing report I get the negative airflow at node 12 error (this node is at entrance to adiabatic space).
I've tried ...