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<font size="+1"><font face="Times New Roman, Times, serif">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<br>
<br>
</font></font>
<div class="moz-cite-prefix">On 09/08/2012 04:07 PM, Adam Barker
wrote:<br>
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<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><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif";color:navy"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:green">Sustainability Project
Manager</span><span style="color:navy"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif";color:gray">Provident
Energy Management Inc.</span><span style="color:navy"><o:p></o:p></span></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"><span style="color:blue">abarker@pemi.com</span></a>
</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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