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<font size="+1">I would not include the large unit. It is a
specific purpose/intermittent unit. I would however investigate
how it is going to be used. Normally you try to segregate the
truck loading areas from the rest of the plant to limit the area
exposed to the exhaust fumes and to make it easier to remove
them. Sometimes though, making large items, this is not
possible. Typically these units are connected to CO/CO2 sensors
and also have an exhaust fan. If you use the MUA unit to blow the
exhaust fumes out it won't work when the doors are closed. This
is why an exhaust fan works better with the MUA unit. The way the
loading normally happens is the trailer is backed in first and the
tractor comes in last, the door is closed and the truck is shut
off for the loading period. That puts all the truck exhaust on
the ceiling by the loading doors. That is where you put the
exhaust fans. The MUA unit is placed across from the exhaust to
push the truck exhaust to the exhaust fans. The unit only runs
until the sensor is satisfied. As Bill mentioned you don't have
to bring that MUA up to plant temperature either, that would
depend on where you are dumping it and how much air there is. You
may not have to heat it at all. I have used systems which bring
in air unheated and use fabric tubes to spread it at ceiling level
in the hot stratified air next to the ceiling.<br>
I don't consider these events in the general system for heating
the building but you do have to consider the event and how to
mitigate it's impact on the plant and meet all the safety rules.
You generally have unit heaters near large roll up doors as they
are leaky and not as well insulated as the rest of the building.
This comes in handy when you open the doors or when you have 10
tons of cold steel sitting in the loading bay. Don't forget floor
drains.<br>
Bruce Easterbrook P.Eng.<br>
Abode Engineering<br>
<br>
</font>
<div class="moz-cite-prefix">On 08/10/2012 08:52 AM, Bishop, Bill
wrote:<br>
</div>
<blockquote
cite="mid:90D829482BDEDB4CB264DE5060592B1905C25219@lightning.pathfinderengineers.com"
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Pete,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Before
increasing the proposed design heating capacity, I would
consider other changes you can make to the model:<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:Symbol;color:#1F497D"><span
style="mso-list:Ignore">·<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Increase
the process/plug loads (after all, it is a manufacturing
facility)<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:Symbol;color:#1F497D"><span
style="mso-list:Ignore">·<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Decrease
the heating thermostat setpoint (70F or less)<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:Symbol;color:#1F497D"><span
style="mso-list:Ignore">·<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">If
you have nighttime setback, create a morning warm-up period<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-.25in;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-size:11.0pt;font-family:Symbol;color:#1F497D"><span
style="mso-list:Ignore">·<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Increase
the thermostat throttling range a few degrees (reflecting
less “comfort” but resulting in fewer unmet hours; IMO a
last resort before adding heating capacity)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Note
that you would make the same changes in the baseline for
any/all of these suggestions.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><a moz-do-not-send="true"
href="mailto:wbishop@pathfinder-ea.com"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:blue;text-decoration:none"><img
id="Picture_x0020_1"
src="cid:part1.02060900.06000208@bellnet.ca"
alt="Senior Energy Engineer 28Jun2012" border="0"
height="114" width="480"></span></a><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a class="moz-txt-link-abbreviated" href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
[<a class="moz-txt-link-freetext" href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Peter Baumstark<br>
<b>Sent:</b> Friday, October 05, 2012 10:54 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] ASHRAE 90.1 Appendix G
Proposed Model<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal"><span
style="font-family:"Arial","sans-serif"">I
have a high bay manufacturing facility with two100% OSA,
CV, low cfm but high air velocity heating only units.
These are intended for comfort heating.<br>
<br>
The building also has one 100% OSA, CV make-up air (MUA)
unit, with a gas furnace. The MUA is only used when one
or more roll-up doors are open with trucks inside and
unloading. This blows the diesel fumes out of the
building. The MUA has almost 3x the air volume capacity
as the two comfort heating units combined.<br>
<br>
When I model the proposed design, with just the two
units intended for comfort heating, I end up with almost
700 unmet heating hours. I add the capacity for the MUA
unit and schedule it for the purpose of comfort heating,
and my unmet hours go down to less than 10.<br>
<br>
Also in 90.1, App G, if unmet load hours exceed 300,
heating capacity can be added incrementally until unmet
load hours are reduced to below 300.<br>
<br>
So would it be fair to not include the MUA unit for
heating, but simply add one or two more of the comfort
heating units to get the unmet hours down? It seems
like it may be over-kill to include the MUA unit for the
purpose of comfort heating.<br>
<br>
Any guidance would be appreciated.<br>
<br>
Thank you,<br>
Pete<o:p></o:p></span></p>
</div>
</div>
</div>
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