[Trace-users] Air Flows (UNCLASSIFIED)

Eurek, John S NWO John.S.Eurek at usace.army.mil
Tue Jul 29 08:39:04 PDT 2014

Classification: UNCLASSIFIED
Caveats: NONE

I use trane trace to get the loads. Then I select equipment, but I do not use the cfms trace provides.

Examples from trace:
Stair well 7 cfm. (The unit I selected has only went down to 200 cfm)
Storage room 12 cfm (I provided 50 cfm)
And I round up other areas such as corridors and offices.

The leed reviewer says the values in the model and in the design do not match.

Do I need to go back through my trace file and enter the air flows I used in my design?
The main system is an AHU with VAV boxes. If I go into each office and enter the airflows to match the drawings, will the program use that airflow at 100% or will the VAV box still modulate?

Will I need to go through the pretend building and also manually change the cfms to match the design? Or should I use the values trace spits out?

Also, a comment was that the pumps (and air handling unit) in the model did not match the model.  I calculated that there would be 40 feet of head in the system, but I selected (and scheduled) a pump that provides a minimum of 60 feet of head. Do I need to enter in the scheduled values or the values I calculated?

Classification: UNCLASSIFIED
Caveats: NONE

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