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<p class=MsoNormal><span style='color:#1F497D'>Hi Ahmed, not knowing the
details of your system and model, but in general by having an ERV, your system
may not be able to take advantage of the free cooling when outdoor air
temperatures are below your return air temperature and there is cooling demand.
It seems from your numbers that free cooling could be available for many days
during the year. During the cooling season, and unless it is bypassed, your ERV
may be preheating cool before it enters the space.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Regards,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Bassam<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<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"'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Ahmed
Azhari<br>
<b>Sent:</b> Monday, May 17, 2010 8:21 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Cooling Energy and Exhaust air heat recovery<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hello Users, <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have a packaged (Heating: Gas-Fired, Cooling: DX) air
handling unit with VAV boxes in the zones. The cooling coil control for the AHU
is Zone reset. I have noticed an odd behavior in the cooling side when I model
an exhaust air heat recovery as follow:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><img width=379 height=241 id="_x0000_i1027"
src="cid:image002.png@01CAF5A5.3218DE60"> <o:p></o:p></p>
<p class=MsoNormal>The cooling energy increase from 67.7MBTU to 132MBTU when I
include 70% exhaust air heat recovery which doesn’t physically make sense
to me.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>When I change the cooling coil control to Outdoor air reset
the results change as follow:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><img width=362 height=211 id="Picture_x0020_3"
src="cid:image003.png@01CAF5A5.3218DE60"><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The above scenario makes sense in a way that both the
heating and cooling energy decreased by incorporating exhaust air heat
recovery. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I appreciate any explanation on the strange behavior of
scenario I<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Best Regards, <o:p></o:p></p>
<p class=MsoNormal><span lang=EN-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>__________________________________________________________________________</span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;color:#0F243E'>Ahmed Azhari</span><span
style='font-size:12.0pt;color:#002060'>, </span><span style='font-size:10.0pt;
color:gray'>B.Eng., LEED® AP</span><span style='font-size:12.0pt;
color:#002060'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:gray'>Energy Analyst<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:gray'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#0F243E'>Jain Sustainability Consultants
Inc.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#002060'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:gray'>2260 Argentia
Road, 2nd Floor<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:gray'>Mississauga,
Ontario L5N 6H7, CANADA<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:gray'>Tel: (905)
542 7211 Ext 234<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:gray'>Fax: (905) 542
7622<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:gray'>Email:</span><span
style='font-size:10.0pt'> </span><a href="mailto:aazhari@jainconsultants.com"><span
style='font-size:10.0pt;color:#0F243E'>aazhari@jainconsultants.com</span></a><span
style='font-size:10.0pt'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:gray'>Web: </span><a
href="http://www.jainassoc.com/"><span style='font-size:10.0pt;color:#0F243E'>www.jainassoc.com</span></a><span
style='font-size:10.0pt;color:#0F243E'><o:p></o:p></span></p>
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