[Equest-users] Modeling infiltration from an adjacent zone

[Michael Campbell]

I should clarify that when I try to change it to Standard, it goes right
back to Air.



*Mike Campbell, E.I.T., LEED AP O+M*
*Sustainability Specialist*
*Sustainable Solutions Corporation*
Office: 610-569-1047

Mobile: 609-923-1743 <http://610-569-1047/>
www.SustainableSolutionsCorporation.com
<http://www.sustainablesolutionscorporation.com/>
*Sustainable Solutions Corporation is WBENC and BCorp Certified.*

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*From:* Michael Campbell [mailto:mike at sustainablesolutionscorporation.com]
*Sent:* Thursday, November 20, 2014 3:28 PM
*To:* 'Nick Caton'; 'equest-users at lists.onebuilding.org'
*Subject:* RE: [Equest-users] Modeling infiltration from an adjacent zone



Thanks for the reply, Nick.



For some reason, this interior wall is defined as an Air wall, and it will
not let me change it to a Standard wall.  It will allow me to change it to
Adiabatic or Interior, just not Standard.  Any ideas?



Thanks,



*Mike Campbell, E.I.T., LEED AP O+M*
*Sustainability Specialist*
*Sustainable Solutions Corporation*
Office: 610-569-1047

Mobile: 609-923-1743 <http://610-569-1047/>
www.SustainableSolutionsCorporation.com
<http://www.sustainablesolutionscorporation.com/>
*Sustainable Solutions Corporation is WBENC and BCorp Certified.*

*This email message and any attachments are for the sole use of the
intended recipient(s) and may contain confidential and privileged
information. Any unauthorized review, use, disclosure or distribution is
prohibited. If you are not the intended recipient, please contact the
sender by reply email and destroy all copies of the original message and
any attachments.*



*From:* Nick Caton [mailto:ncaton at gmail.com <ncaton at gmail.com>]
*Sent:* Thursday, November 20, 2014 2:55 PM
*To:* 'Michael Campbell'; equest-users at lists.onebuilding.org
*Subject:* RE: [Equest-users] Modeling infiltration from an adjacent zone



Hi Mike!



Like many things, I’d adjust my approach depending on how accurate/critical
this infiltration is to the whole picture.



Most simple approximation:

Assign/bump up the infiltration inputs at the corridor space (detailed
edit) to draw additional quantities of raw outside air.  Assign a custom
infiltration schedule (applied only to this space) to approximate when and
to what extent infiltration occurs.  This is a few steps back from reality,
for reasons that will hopefully become clear after reading the rest of this
reply.



Time-allowing / closer to reality:

1.       Model the loading dock as a space adjacent to the corridor.
Exterior perimeter construction should account for loading dock door
thermal performance in the closed position (or else model explicitly as
opaque doors).

2.       Estimate an elevated infiltration flow rate/schedule to represent
normal levels of infiltration in the dock on a day-to-day (not “design,”
necessarily) basis.

a.       Consider prescriptive loading dock weatherseal requirements in
90.1 and similar, as may apply in the actual design

b.      If this dock is of the “open service garage” variety where modest
winds will “flush” the space with multiple bays left open, you might want
to consider a substantial wind-driven ACH quantity as well, to capture that
behavior

c.       Keep in mind this is not something to dwell hours on – you are
just looking to get a fair approximation of actual dock space temps.  Use
the space temperature reports (or custom  hourly reports) to track and QC
the resulting space temperatures – adjust your inputs as necessary.

3.       The above efforts will result in a zone with a realistic annual
space temperature profile, tempered relative to the outside air temps.
Thermostats in the dock space (if conditioned) and the interior
constructions bordering the dock will likely need attention in turn to
avoid unmet hours for the dock and any all thermally connected conditioned
zones.

4.       The above will capture the hourly conductive transfer effects on
the corridor, and may be a good stopping point if the construction of the
corridor/dock wall is tight and doors between them are not actively
opened.

5a.  Assuming the adjacent corridor transitions are “active” and/or leaky
wall construction, with doorways routinely left or propped open, you could
*approximate* the associated infiltration by specifying a section of air
wall under the corridor space (interior surface, NEXT-TO dock) equal to the
free area between the spaces.  Note this approximation can’t “schedule”
when the doors are open/closed.

5b.  A more in-depth model could alternatively set up the dock as a
sunspace,  permitting you to define an interior wall construction assigned
wall parameters to simulate natural convective heat transfer between the
two zones when doors are open.  At the associated sunspace zone, you could
further define an SS-FLOW-SCH to account for normal door operation behavior
(i.e. doors remain closed on holidays and in the evening hours).



~Nick



*From:* Equest-users [mailto:equest-users-bounces at lists.onebuilding.org
<equest-users-bounces at lists.onebuilding.org>] *On Behalf Of *Michael
Campbell
*Sent:* Thursday, November 20, 2014 8:30 AM
*To:* equest-users at lists.onebuilding.org
*Subject:* [Equest-users] Modeling infiltration from an adjacent zone



Hi,



I have a corridor next to a loading dock. And the corridor is experiencing
infiltration from the loading dock.  Is it possible to model this, and if
so, how?



Thanks,



*Mike Campbell, E.I.T., LEED AP O+M*
*Sustainability Specialist*
*Sustainable Solutions Corporation*
Office: 610-569-1047

Mobile: 609-923-1743 <http://610-569-1047/>
www.SustainableSolutionsCorporation.com
<http://www.sustainablesolutionscorporation.com/>
*Sustainable Solutions Corporation is WBENC and BCorp Certified.*

*This email message and any attachments are for the sole use of the
intended recipient(s) and may contain confidential and privileged
information. Any unauthorized review, use, disclosure or distribution is
prohibited. If you are not the intended recipient, please contact the
sender by reply email and destroy all copies of the original message and
any attachments.*
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