Family don't calculates airflows.

[Anonymous]

Hi. 

I try to create family of AHU. I created very easy example, because I wanted to check how is it works. There are 4 connectors.
- air from room
- supply air to room
- fresh air
- exhaust air

I connected air from room with exhaust air diffusers, and supply air wit supply air diffusers. They have set som airflows. I would like to, connector of fresh air took the value of supply air etc. What i done wrong, why is not working?

Thank you for replies. 

I attach data. 

[dbutts7]

Here's a link to a post I wrote about air flow settings in Revit...it's based on 2013 but the theory is the same - let me know if it helps explain how this works -

http://mep-cad.blogspot.com/2013/01/getting-in-flow-with-revit-hvac.html

thanks - David B.

[dbutts7]

For connecting air flow values from one connector to another, you can accomplish this by adding a parameter that is defined as a formula for the other airflow value. The rules are important to follow:

- the values must be the same format - in other words, this works best when both parameters use the default Air Flow units - you don't want to combine common text with a duct specific Air flow parameter

- the values must be defined in the same family, to "inherit" the same values. Don't try to do this as a project parameters, it needs to be specific to the part

- Make the airflow value instance based, so you can make adjustments based on the exact airflow at the unit, rather than by the type.

hope this helps - thanks - David B.