Flow Calculation through Mechanical Equipment in Parallel

[josh.stewart752411]

Hi Guys,

I am having issues with my model, where I have placed multiple Filter banks in a row and connected them into my duct header in parallel, prior to connection into my exhaust fans.
As you can see from the attached image, I have air flow into a header (the under slung duct with red arrow) above my filter housings, where legs branch off the side, and drop down into my filters.
I have set up the filter housings as mechanical equipment with the following settings on the two duct connectors:

Filter Inlet:
Flow Configuration:Calculated
Flow Direction: In
System Classification: Exhaust Air
Loss Method: Specific Loss

Filter Outlet:
Flow Configuration: Preset
Flow Direction: Out
System Classification: Exhaust Air
Loss Method: Not Defined

The filters are then connected back up into another header above (blue arrow) which takes the air to the fans.

I am still relatively new to Revit, so I may have missed something fairly elementary, but when I place the second filter bank in the model, the flow calculations cease to function.
Does Revit not allow this sort of functionality or do I have to amend my model? I had assumed that I could balance the dampers attached to my dropped legs, however I am unaware how I could achieve this.

Any help would be appreciated

Josh

[josh.stewart752411]

No Worries Guys,

I managed to solve my own problem.

I was not aware of the functionality of the "System" flow configuration.

By amending the inlet and outlet of the filter housing to show:

Flow Configuration: System
Flow Direction: In/Out
System Classification: Global
Loss Method: Not Defined

and then linking the connectors together and using an instance Flow factor parameter, I was able to specify the proportion of flow to each filter bank and it allowed flow across the parallel system.

If anyone else has this issue and that description is not helpful, please say and I can post a more detailed explanation.