Windcatcher: 0 values in variable "MacroFlo external ventilation"

[narias]

Hi! I want to know if you can help me with some doubts about a test with IESVE that I am doing

I am evaluating the performance of a windcatcher through a simulation and I had consistent results in Vista Pro in MacroFlo Arrows (l / s). Also I have consistent values of "air temperature" in the rooms selected in the VistaPro variables. However when I want evaluate the variable "MacroFlo external vent", I get a value of 0.(I confirm the variable "MacroFlo external vent" in the Model Browser, in "Windcatcher Duct" and it gives me value 0, unlike the "Windcatcher" where if flow values are obtained).

Something similar happens when I import border conditions to MicroFlo, where the resulting flow rate is minimal and graphically does not seem to cross the damper.

I dont know if this is a limitation of the software regarding these components (windcatcher) or this is an error on my data?

[PCully]

Hi,

If you are using a windcatcher from our Monodraught library (or similar style created yourself) then it might be a simple case of what variable you want to look at. The windcatchers have multiple geometry components to them, there is usually an outside part on top of the buidling and then the damper will be modelled as an intermediate volume between that component and the room itself, the windcatcher component will show arrows and has an ext MacroFlo flow associated to it but from that point onwards we consider the flow to be internal through the damper and into the room so when you are reviewing the results inside your room the variable you are interested in will be the MacroFlo internal vent (i.e. what is being shared through the internal opening between windcatcher and room)

If you have arrows the simulation must have run and MacroFlo calculations are picking up air entering and exiting via the windcatcher so that all sounds to be running correctly

Phil