AHU mixing box

[bvm76]

is it possible to create a mixing box to calculate the flow to AHU (see attached).

[Thomas]

I think what you want is to add the flow from the Return Air connector and Fresh Air connector to the Supply Air connector?  You could try assigning a parameter to each connectors flow and then simply making the Supply one a formula of the other two.  They will probably all need to be Instance Based to work on the fly.  I recall doing something simular and having issues with it so make sure you do some testing.  Hope this puts you on the right track.

[bvm76]

Thank you for your reply.

Already did as you described and it works pretty well in the family editor. However, when i load the family into a project no flow is indicated to duct that connects to ahu.

[bvm76 · Accepted solution]

never mind I found a workaround to this. its not clean but at least it works.

[bvm76]

Thank you for your response.

Yes i did that and it calculates correctly in family editor but when you load the family into a project, it won't work. There is no flow going to AHU.

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