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<DIV dir=ltr align=left><SPAN class=070295015-17052010><FONT face=Arial
color=#0000ff size=2>Your cooling loads are so small, I suspect there is some
kind of net effect (sometimes smaller, sometimes greater loads) happening.
For example, if your ERV is sensible only, perhaps the increase in latent loads
is more than offsetting your sensible savings. Can't tell without knowing
more about your system and your weather data. Take a look at your hourly
"savings" for clues.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=070295015-17052010><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=070295015-17052010><FONT face=Arial
color=#0000ff size=2>Glenn</FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> 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 11:21 AM<BR><B>To:</B>
equest-users@lists.onebuilding.org<BR><B>Subject:</B> [Equest-users] Cooling
Energy and Exhaust air heat recovery<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<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 id=_x0000_i1027 height=241
src="cid:070295015@17052010-34A1" width=379> <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 id=Picture_x0020_3 height=211
src="cid:070295015@17052010-34A8" width=362><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: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'">__________________________________________________________________________</SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 12pt; COLOR: #0f243e">Ahmed
Azhari</SPAN><SPAN style="FONT-SIZE: 12pt; COLOR: #002060">, </SPAN><SPAN
style="FONT-SIZE: 10pt; COLOR: gray">B.Eng., LEED® AP</SPAN><SPAN
style="FONT-SIZE: 12pt; COLOR: #002060"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: gray">Energy
Analyst<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; 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: 10pt; COLOR: gray">2260 Argentia
Road, 2nd Floor<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: gray">Mississauga,
Ontario L5N 6H7, CANADA<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: gray">Tel: (905)
542 7211 Ext 234<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: gray">Fax: (905) 542
7622<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: gray">Email:</SPAN><SPAN
style="FONT-SIZE: 10pt"> </SPAN><A
href="mailto:aazhari@jainconsultants.com"><SPAN
style="FONT-SIZE: 10pt; COLOR: #0f243e">aazhari@jainconsultants.com</SPAN></A><SPAN
style="FONT-SIZE: 10pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: gray">Web: </SPAN><A
href="http://www.jainassoc.com/"><SPAN
style="FONT-SIZE: 10pt; COLOR: #0f243e">www.jainassoc.com</SPAN></A><SPAN
style="FONT-SIZE: 10pt; COLOR: #0f243e"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-CA
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
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