<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:"Century Gothic";
panose-1:2 11 5 2 2 2 2 2 2 4;}
@font-face
{font-family:Webdings;
panose-1:5 3 1 2 1 5 9 6 7 3;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal;
font-family:"Century Gothic","sans-serif";
color:windowtext;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1027" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body bgcolor="white" lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I had a similar problem on my first energy model in equest. In my case it was associated with one particular “problem child” zone.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The heating and cooling loads of this one zone were extreme – Particularly, in Alaska’s coldest winter months (December, January) and I struggled with it for
about half a day trying to figure it why. It was a VAV system calling for heating AND cooling in the middle of Winter in Alaska?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The cause of the drama ended up being an exhaust fan (hood) in the kitchen/cooking zone.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The fan energy and flow of the exhaust fan was fine and schedules were fine. But while operating it caused the VAV system to operate excessively in response.
So much that it overheated the space, it would then cool the space excessively, it would then heat the space again (total madness).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Not only that but it was pulling the same OSA ratio as the rest of the zones in the system - Alaskan OSA in December/January no less! Here-in lied the problem.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Once I was able to put this together I was able to apply an easy fix.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I set up a new OSA ratio schedule for this VAV system that directly corresponded to the exhaust fan schedule. When exhaust fan was on it would pull recirculated/return-air
only and OSA dampers would be shut. Instantly fixed the problem.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I would definitely check the heating/cooling loads throughout to make sure nothing is throwing the system too off-kilter.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Also, I highly recommend using the mixed air reset as mentioned in the previous post.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">-Chris Baker<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<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 [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Brian Fountain<br>
<b>Sent:</b> Friday, December 18, 2015 5:04 AM<br>
<b>To:</b> Nufal, Maye; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Heat Recovery Increases Cooling load<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal" style="background:white"><span style="font-family:"Calibri","sans-serif";color:#1F497D">The default settings for heat recovery control is'float' which always maximizes heat recovery, even if it reduces free cooling. Changing this to 'mixed
air reset' will help.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><span style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><span style="font-family:"Calibri","sans-serif";color:#1F497D">Also, on the 2nd heat recovery tab, the default is 1" of static added to the supply fan (on top of whatever you have on the fan tab) to account for
the added fan power to push the air through the heat recovery device. <o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><span style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
</div>
<table class="MsoNormalTable" border="0" cellpadding="0" width="100%" style="width:100.0%;background:white;border-spacing:0px">
<tbody>
<tr>
<td style="padding:.75pt .75pt .75pt .75pt;font-size:initial;text-align:initial">
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<div>
<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"">Nufal, Maye<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Sent:
</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Friday, December 18, 2015 8:58 AM<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">To:
</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""><a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Subject:
</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">[Equest-users] Heat Recovery Increases Cooling load<o:p></o:p></span></p>
</div>
</div>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"><o:p> </o:p></p>
<div id="_originalContent">
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">Hi,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">We’ve been facing the same issue in multiple projects ; using heat recovery somehow increases our cooling load.
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">This was evident in a VAV system as well as Central Plant Systems .</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">We’ve tried using both Sensible HX/Enthalpy wheel with same results.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">Has anyone been able to tackle this issue ?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">Help/workaround ideas is appreciated.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">THANKS
</span><span style="font-size:10.0pt;font-family:Wingdings">J</span><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif"">MN</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""> </span><o:p></o:p></p>
<div>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif";color:#FF9B26">Maye Nufal , LEED BD+C</span></b><o:p></o:p></p>
<div>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Century Gothic","sans-serif";color:black">Sustainable Buildings Consultant<br>
Stantec <br>
100-401 Wellington Street West Toronto ON M5V 1E7<br>
Phone: (416) 598-7157<br>
Fax: (416) 596-7892<br>
<a href="mailto:Maye.Nufal@stantec.com"><span style="color:black;text-decoration:none">Maye.Nufal@stantec.com</span></a></span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:4.0pt;font-family:"Century Gothic","sans-serif";color:black"> </span><o:p></o:p></p>
</div>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0">
<tbody>
<tr>
<td style="padding:0in 0in 0in 0in">
<p class="MsoNormal"><a href="http://www.stantec.com/"></a><!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f">
<v:stroke joinstyle="miter" />
<v:formulas>
<v:f eqn="if lineDrawn pixelLineWidth 0" />
<v:f eqn="sum @0 1 0" />
<v:f eqn="sum 0 0 @1" />
<v:f eqn="prod @2 1 2" />
<v:f eqn="prod @3 21600 pixelWidth" />
<v:f eqn="prod @3 21600 pixelHeight" />
<v:f eqn="sum @0 0 1" />
<v:f eqn="prod @6 1 2" />
<v:f eqn="prod @7 21600 pixelWidth" />
<v:f eqn="sum @8 21600 0" />
<v:f eqn="prod @7 21600 pixelHeight" />
<v:f eqn="sum @10 21600 0" />
</v:formulas>
<v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect" />
<o:lock v:ext="edit" aspectratio="t" />
</v:shapetype><v:shape id="_x0000_s1026" type="#_x0000_t75" alt="Stantec" href="http://www.stantec.com/" style='position:absolute;margin-left:0;margin-top:0;width:75pt;height:20.25pt;z-index:251658240;mso-wrap-distance-left:0;mso-wrap-distance-top:0;mso-wrap-distance-right:0;mso-wrap-distance-bottom:0;mso-position-horizontal:left;mso-position-horizontal-relative:text;mso-position-vertical-relative:line' o:allowoverlap="f" o:button="t">
<v:imagedata src="http://www.stantec.com/content/dam/stantec/images/esignature/stantec.png" />
<w:wrap type="square"/>
</v:shape><![endif]--><![if !vml]><a href="http://www.stantec.com/"><img border="0" width="100" height="27" src="http://www.stantec.com/content/dam/stantec/images/esignature/stantec.png" align="left" alt="Stantec" v:shapes="_x0000_s1026"></a><![endif]><a href="http://www.stantec.com/"></a><o:p></o:p></p>
</td>
</tr>
</tbody>
</table>
<div>
<p class="MsoNormal"><span style="font-size:2.0pt;font-family:"Century Gothic","sans-serif";color:black"> </span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:4.0pt;font-family:"Century Gothic","sans-serif";color:black"> </span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:7.0pt;font-family:"Century Gothic","sans-serif";color:black">The content of this email is the confidential property of Stantec and should not be copied, modified, retransmitted, or used for any purpose except with
Stantec's written authorization. If you are not the intended recipient, please delete all copies and notify us immediately.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:4.0pt;font-family:"Century Gothic","sans-serif";color:black"> </span><o:p></o:p></p>
</div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:Webdings;color:#008040">ü</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span><span style="font-size:7.0pt;font-family:"Century Gothic","sans-serif";color:#008040">Please
consider the environment before printing this email.</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">
</span><o:p></o:p></p>
</div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Century Gothic","sans-serif""> </span><o:p></o:p></p>
<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
</div>
</div>
<br>
<hr>
<font face="Courier New" color="Gray" size="2"><br>
CCI-Alliance Confidentiality notice: This message is intended only for the person to whom addressed in the text above and may contain privileged or confidential information. If you are not that person, any use of this message is prohibited. We request that
you notify us by reply to this message, and then delete all copies of this message including any contained in your reply. Thank you.<br>
</font>
</body>
</html>