Saturday, December 01, 2012

Set Calculations to Stun

Attending sessions at a conference is always a good way to come up with ideas for new blog posts. This post was inspired by David Butt's session at Autodesk University 2012 about Pipe and Duct Systems. I was working as one of his lab assistants and he mentioned this so I made a note to myself to mention it again, here.

By the way sorry about the title, I was thinking of the Star Trek "Set phasers to Stun" command that Captain Kirk often uttered. Literary license, I was just rhyming Stun with None.

In Revit MEP you can create systems for pipe and duct, meaning just the act of sketching one of them assigned to a particular system will impose certain design properties and graphical qualities to that element automatically. In the past the only way a duct or pipe could behave this way was to connect it to a component or to another duct or pipe that was already. That made it harder to just sketch pipe or duct (schematic design) and use it to represent different uses, like supply or return air, or hot versus cold water.

One of the properties of these systems is called Calculations and you can choose between None, Flow Only or All.

Since Revit only does fluid based calculations (piping) it doesn't make much sense to "waste" any CPU cycles on trying to do calculations on pipe systems for gases like oxygen or nitrogen. Same is true if you really aren't going to rely on Revit for pipe sizing or related calculations either. Any system that isn't going to need this ought to be assigned to None.

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