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Thread: K Factor for Trane VAV
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04-07-2005, 10:12 AM #1
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Anyone have a K factor chart for VCW boxes?
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04-07-2005, 05:35 PM #2
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I have a list of Flow Coefficients from a Siemens manual that lists a Trane box as 0.66.
It does not list model numbers and I don't know how old the list is.
Hope that helped.
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04-07-2005, 06:51 PM #3
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Sys is this the older boxes or the newer ones?
I have a IOM manual on these model boxes in Pdf form and at the beginning it says for air balancing instructions see
EA10_IOM2-E, the manual I have doesnt have the K factor but the one I just listed should.Dad's Hideout The online mancave for dads
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04-07-2005, 09:10 PM #4
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If you know the inlet size of the box, regardless of manufacturer, the number will be the same. A 10" box is a 10" box, ask any balancer.
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04-07-2005, 09:13 PM #5
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...you know you say that and they all end up being a little different. What's the reason is what I want to really know.
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04-07-2005, 09:30 PM #6
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Even if they are the slightest bit different, your balancer should give you the proper multiplier to compensate for that, but I know what your talkin about!! I'll check my online info for the Trane VCW box and get you the correct info, hey man, don't you ever sleep? Bacnet rules!!
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04-07-2005, 09:32 PM #7
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... too busy fighting the ASHRAE BACnetter propaganda...
if somebody would send over a cape I'd be set.
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04-07-2005, 11:01 PM #8
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Sys, see my post above, that should be the manual you need
Dad's Hideout The online mancave for dads
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04-08-2005, 05:15 PM #9
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Keep up the good fight, we need you!Originally posted by sysint
... too busy fighting the ASHRAE BACnetter propaganda...
if somebody would send over a cape I'd be set."Profit is not the legitimate purpose of business. The legitimate purpose of business is to provide a product or service that people need and do it so well that it's profitable."
James Rouse
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04-09-2005, 09:48 PM #10
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Sometimes K factors are....
....the amount of CFM a box will deliver at 1 inch of differentialpressure.
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04-16-2010, 11:50 AM #11
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reviving this thread... I was looking for the same thing, found this IOM dated June 2006. See page 32 for an updated pressure differential vs cfm flow chart with actual box sizes.
http://www.trane.com/Commercial/Uplo...av_unitiom.pdf
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04-16-2010, 04:32 PM #12
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Trane K Factors
Duct Size Area K Factor
5 .14 3.27
6 .20 2.65
8 .35 2.44
10 .55 2.30
12 .79 2.30
14 1.07 2.30
16 1.40 2.27
This is the chart I have for Trane, hope it helps!!!!
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04-16-2010, 04:45 PM #13
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HW spudders ask for the k-factors as box CFM @ 1 in w.c.
What's the conversion from your method?
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