[Trace-users] Transfer air & room exhaust calculations & system calculations

Wed Jan 18 14:29:30 PST 2017

Hi Brad-

Interesting predicament. Common question.

>From your images, it looks like 116 should have the adjacent room set as
115, and 115 should have the adjacent room set as 196. That would match the
flow from your diagram.

That should change your results, but probably won't fix them.

Next thing is that it looks like the total system ventilation is 101 cfm.
The TRACE air transfer is controlled based on the room ventilation. You
can't exhaust more than you have ventilated (vent+infiltration)

For instance, I created a simple file with similar room names and I set 101
cfm of ventilation to 196. That seems to get it right, except for the
Algebra for Room 116 "SA" because TRACE will not count transfer air as
Supply air.

See the attached file and let me know if you have questions.

Bob Fassbender
Energy-models.com
ᐧ

On Wed, Jan 18, 2017 at 1:57 PM, Eisenbarth, Brad via Trace-users <
trace-users at lists.onebuilding.org> wrote:

> I am trying to use Trane Trace 700 to calculate my room airflows and
> system airflows & load requirements for the room air balance diagram show
> in the snip it below, also attached.
>
>
>
> I have set up a Trace model with the 3 spaces shown (CIRCULATION 196, ANTE
> ROOM 115, & CONTAINMENT SUITE 116).  I have input information for exterior
> walls, windows, doors, lighting loads, & miscellaneous loads.  I want Trace
> to do the usual load calculation for these spaces but also include the
> transfer air requirements.  I’m having trouble getting the transfer air to
> be included in the room and system level airflow calculations.  See snip it
> below & attached for my inputs in the Create Rooms – Airflow Tab for each
> of the 3 spaces mentioned.
>
>
>
> The resulting System & Room Checksums are attached.  The transfer air is
> not being calculated correctly.  CONTAINMENT SUITE is negative but not by
> 100 CFM as it should be.  CIRCULATION supply air and return air are equal
> which is also incorrect, 100 CFM of the supply air (which is greater than
> the 89 CFM calculated, I’ll have to artificial bump this up to at least 100
> CFM) should be couted as transfer air to CONTAINMENT SUITE, therefore there
> shouldn’t be any return air for this space.
>
>
>
> Questions:
>
>
>
> 1.       Has anyone been successful specifying a transfer air value vs
> letting Trane Trace 700 calculate it? If so, how?
>
> 2.       Does anyone know why my transfer air from CIRCULATION isn’t
> being calculated in the return air value?  Again, is there a way to set the
> transfer air from a space?  If so, how?
>
> 3.       Does anyone have recommendations how to potentially fix this
> (under create rooms – airflow tab, system level, or potentially other
> ways)?
>
>
>
>
>
>
>
>
>
>
>
>
>
> Thanks,
>
>
>
> Brad Eisenbarth, CDT
>
> [image: cid:image001.png at 01D089A3.3AF406D0]
> T 314.425.8799 <(314)%20425-8799>
>
>
>
> _______________________________________________
> Trace-users mailing list
> http://lists.onebuilding.org/listinfo.cgi/trace-users-onebuilding.org
> To unsubscribe from this mailing list send  a blank message to
> TRACE-USERS-UNSUBSCRIBE at ONEBUILDING.ORG
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20170118/5b19a544/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.jpg
Type: image/jpeg
Size: 43772 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20170118/5b19a544/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image005.png
Type: image/png
Size: 38762 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20170118/5b19a544/attachment-0008.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image006.png
Type: image/png
Size: 39706 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20170118/5b19a544/attachment-0009.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image007.png
Type: image/png
Size: 39002 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20170118/5b19a544/attachment-0010.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 6945 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20170118/5b19a544/attachment-0011.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: DaisyChain.trc
Type: application/octet-stream
Size: 747520 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/trace-users-onebuilding.org/attachments/20170118/5b19a544/attachment-0002.obj>