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I have found an explanation:<BR>
Look your air system. <BR>
<BR>
If your cooling system is installed before the heat exchanger you will cool the air and then heat it. So you will need much more energy than without HE. So change the position of the HE in the system. In theory that can be the problem but I don´t have experience with complex energy systems on eQUEST.<BR>
<BR>
example summer day <BR>
<BR>
outdoor air ... 30ºC<BR>
Cross the cooling system 20ºC --->delta T=10ºC<BR>
cross the HE system 25ºC<BR>
<BR>
Without HE<BR>
outdoor air ... 30ºC<BR>
Cross the cooling system 25ºC --->delta T=5ºC<BR>
<BR>
<BR>
Mateo de Guadalfajara.<BR>
<BR>
<BR>
Mateo de Guadalfajara Pinilla<BR>
<A href="mailto:mateo_mw@hotmail.com">mateo_mw@hotmail.com</A><BR>
Engineer Energy systems and construction Student<BR>
Looking for a job :)<BR>
<BR>
<BR>
<HR id=stopSpelling>
<BR>
Date: Mon, 17 May 2010 11:55:04 -0400<BR>From: Glenn.Haynes@kema.com<BR>To: aazhari@jainconsultants.com; equest-users@lists.onebuilding.org<BR>Subject: Re: [Equest-users] Cooling Energy and Exhaust air heat recovery<BR><BR><BR>
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<DIV dir=ltr align=left><SPAN class=ecx070295015-17052010><FONT color=#0000ff size=2 face=Arial>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=ecx070295015-17052010><FONT color=#0000ff size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=ecx070295015-17052010><FONT color=#0000ff size=2 face=Arial>Glenn</FONT></SPAN></DIV><BR>
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<FONT size=2 face=Tahoma><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=ecxSection1>
<P class=ecxMsoNormal>Hello Users, </P>
<P class=ecxMsoNormal> </P>
<P class=ecxMsoNormal>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:</P>
<P class=ecxMsoNormal> </P>
<P class=ecxMsoNormal><IMG id=ecx_x0000_i1027 src="cid:070295015@17052010-34A1" width=379 height=241> </P>
<P class=ecxMsoNormal>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.</P>
<P class=ecxMsoNormal> </P>
<P class=ecxMsoNormal>When I change the cooling coil control to Outdoor air reset the results change as follow:</P>
<P class=ecxMsoNormal> </P>
<P class=ecxMsoNormal><IMG id=ecxPicture_x0020_3 src="cid:070295015@17052010-34A8" width=362 height=211></P>
<P class=ecxMsoNormal> </P>
<P class=ecxMsoNormal>The above scenario makes sense in a way that both the heating and cooling energy decreased by incorporating exhaust air heat recovery. </P>
<P class=ecxMsoNormal> </P>
<P class=ecxMsoNormal>I appreciate any explanation on the strange behavior of scenario I</P>
<P class=ecxMsoNormal> </P>
<P class=ecxMsoNormal>Best Regards, </P>
<P class=ecxMsoNormal><SPAN style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt" lang=EN-CA>__________________________________________________________________________</SPAN><SPAN style="FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: 10pt"></SPAN></P>
<P class=ecxMsoNormal><SPAN style="COLOR: #0f243e; FONT-SIZE: 12pt">Ahmed Azhari</SPAN><SPAN style="COLOR: #002060; FONT-SIZE: 12pt">, </SPAN><SPAN style="COLOR: gray; FONT-SIZE: 10pt">B.Eng., LEED® AP</SPAN><SPAN style="COLOR: #002060; FONT-SIZE: 12pt"></SPAN></P>
<P class=ecxMsoNormal><SPAN style="COLOR: gray; FONT-SIZE: 10pt">Energy Analyst</SPAN></P>
<P class=ecxMsoNormal><SPAN style="COLOR: gray; FONT-SIZE: 10pt"> </SPAN></P>
<P class=ecxMsoNormal><SPAN style="COLOR: #0f243e">Jain Sustainability Consultants Inc.</SPAN></P>
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<P class=ecxMsoNormal><SPAN style="COLOR: gray; FONT-SIZE: 10pt">2260 Argentia Road, 2nd Floor</SPAN></P>
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<P class=ecxMsoNormal><SPAN style="COLOR: gray; FONT-SIZE: 10pt">Email:</SPAN><SPAN style="FONT-SIZE: 10pt"> </SPAN><A href="mailto:aazhari@jainconsultants.com"><SPAN style="COLOR: #0f243e; FONT-SIZE: 10pt">aazhari@jainconsultants.com</SPAN></A><SPAN style="FONT-SIZE: 10pt"></SPAN></P>
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