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<font size="+1"><font face="Times New Roman, Times, serif">I have
used infrared heaters in a high bay application but they were
wall mounted closer to the floor and were used to protect the
footings from freezing in a mothballed building. They can be a
hazard with forklifts running around. Most high bays use large
fans to drive the warm air back down and prevent or reduce
stratification. Much depends on the warehouse and how it is
used. Many don't have much of an occupant load and don't need
much fresh air. Saving heating costs means minimizing fresh
air. Mostly you are protecting the products stored in the
warehouse.</font> ASHRAE has a 30% guideline on their website
for warehouses which gives some guidance on good design to reduce
energy consumption.<br>
<a class="moz-txt-link-freetext" href="http://www.ashrae.com/standards-research--technology/advanced-energy-design-guides">http://www.ashrae.com/standards-research--technology/advanced-energy-design-guides</a><br>
Bruce<br>
<br>
</font>
<div class="moz-cite-prefix">On 09/08/2012 04:42 PM, Busman, Michael
R wrote:<br>
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<p class="MsoNormal"><span style="color:#1F497D">You raise a
good point, Bruce. I forgot to add in my other email if
consideration had been given to closed-combustion infrared
heating as I was pondering the difficulties in heating high
bay areas.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Mike<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
<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>Bruce Easterbrook<br>
<b>Sent:</b> Thursday, August 09, 2012 1:35 PM<br>
<b>To:</b> Adam Barker<br>
<b>Cc:</b> 'equest-users'<br>
<b>Subject:</b> Re: [Equest-users] Cambridge direct
fired units in warehouse space<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span
style="font-size:13.5pt">You have to be careful where you
use these types of heaters due to IAQ. Direct fired units
dump the products of combustion into the building as well as
fresh air. So you basically have CO2, CO, and water,
minimum going into the building with the air. There can be
other nasties as well depending on how efficient the burn
is. In Canada their application is very limited by law.<br>
Bruce Easterbrook P.Eng.<br>
Abode Engineering</span><o:p></o:p></p>
<div>
<p class="MsoNormal">On 09/08/2012 04:07 PM, Adam Barker
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">Hello everyone,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I was recently asked to model the impact
of Cambridge ‘direct’ fried air handling units for a
warehouse building compared to a conventional MUA with
supply and exhaust. Has anyone had experience with these
units?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">They boast a very low fan power
consumption (5 hp for 8565 cfm of air), 92% thermal
efficiency, and a temperature rise and max discharge temp of
160 F.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Most of the inputs are straightforward
however I am not sure I am modeling the 160 F temperature
rise properly. As of now I have Packaged Single Zone
systems and have entered 160 F as both the ‘zone entering
max supply temp’ and ‘hot deck max leaving temp’. Would this
fully capture that temperature rise? I ask as I am getting
about 150-200 unmet heating hours in these zones, even
though all other inputs are as per the mechanical engineer.
Is this significant, or likely just the difference between
how eQuest and the mechanical engineer size their loads?
The building is a cold climate (southern Ontario, Canada)
LEED building, so I want to make sure I am modeling as much
benefit as possible.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:green">Adam
Barker</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:green">,
C.E.T., LEED AP BD+C</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:green">Sustainability Project
Manager</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:gray">Provident
Energy Management Inc.</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:gray">T:
416-736-0630 x 1874 |
<a moz-do-not-send="true" href="mailto:abarker@pemi.com">abarker@pemi.com</a>
</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif""><br>
<br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Equest-users mailing list<o:p></o:p></pre>
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