<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=us-ascii"><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: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;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-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;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Balloon Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0in;
margin-right:0in;
margin-bottom:0in;
margin-left:.5in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
/* List Definitions */
@list l0
{mso-list-id:1373456346;
mso-list-type:hybrid;
mso-list-template-ids:334659582 67698703 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
@list l0:level1
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level2
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level3
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
@list l0:level4
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level5
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level6
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
@list l0:level7
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level8
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level9
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
ol
{margin-bottom:0in;}
ul
{margin-bottom:0in;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</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 lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hello All,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am modeling a packaged single zone with ERV in phoenix, AZ on a facility that is 24x7 and has more than 75% OA.<o:p></o:p></p><p class=MsoNormal>When I apply ERV, the fan energy increases, a slight savings in the cooling energy, which I can understand. However, practically there is zero heating consumption. Obviously, something is wrong. Here’s a screen shot of my input at the ERV tab. I tried both with leaving the design OA flow/Exhaust Flow blank and with specifying a value – no change – they produce zero heating consumption.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I did just a portion of the building in Trane TRACE and it did the same thing first – practically no heating energy consumption. Then, thought maybe this is what is happening:<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Winter outdoor air is at say 30F<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Space exhaust air temp is at say 66F<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>If the ERV effectiveness is 76%, then ERV could raise the OA from 360F to 57F.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>If the required space temp for winter is 68F.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='mso-list:Ignore'>5.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Then, are the people load, lighting load and plug load providing the rest of the heat from 57F to 68F – since this is a 24x7 facility?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>It turns out in Trane Trace, if I knock the people sensible and latent to 1 btu then I am seeing a significant space heating energy consumption with ERV (still below my base case without ERV).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I tried this same thing in eQuest – didn’t work – no change in heating energy consumption.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I searched through the list and one other user has experienced similar results but no solutions yet.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Any help would be greatly appreciated.<o:p></o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal>Prem<o:p></o:p></p><p class=MsoNormal><img width=750 height=465 id="Picture_x0020_1" src="cid:image003.jpg@01CE7CDC.EA29A450"><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Arial","sans-serif";color:black'>Premnath Sundharam, AIA, LEED AP BD+C, BEMP, CEM</span></b><span style='font-size:12.0pt;font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Architect | Senior Associate<o:p></o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#4D4D4D'><a href="mailto:psundharam@dlrgroup.com"><span style='color:#4D4D4D'>psundharam@dlrgroup.com</span></a><o:p></o:p></span></p></div><div><p class=MsoNormal><b><span style='font-family:"Arial","sans-serif";color:black'>DLR Group</span></b><span style='font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:black'>Architecture Engineering Planning Interiors<o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#4D4D4D'>o: 602-381-8580<br>6225 North 24th Street, Suite 250 Phoenix, AZ 85016-2042<br>Find us at: <a href="http://www.dlrgroup.com/"><span style='color:#4D4D4D'>dlrgroup.com</span></a> | <a href="http://www.facebook.com/dlrgroup/"><span style='color:#4D4D4D'>Facebook</span></a> | <a href="http://www.twitter.com/dlrgroup/"><span style='color:#4D4D4D'>Twitter</span></a><br><br><i>ARCHITECT magazine names <a href="http://www.architectmagazine.com/business/the-architect-501.aspx"><span style='color:#F7403A'>DLR Group #1</span></a> firm in the U.S.</i></span><o:p></o:p></p></div></body></html>