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<font size="+1">Hi Prem,<br>
<font size="+1">The 99% <font size="+1">heating design for Ph<font
size="+1">o</font>enix is 38F, so that will jump your
temperatures. <font size="+1">A</font> buildings <font
size="+1">total energy consumption can be in the ran<font
size="+1">ge of 30% for lightin<font size="+1">g. eQuest
also has high defaults for W/<font size="+1">SF for
lighting. I would check these first to make sure the
lighting levels are where they should be. An ERV <font
size="+1">recovers latent energy as well which will
reduce energy consumption if you are control<font
size="+1">ling humidity as well. I think that for
an ERV to heat you have to give it a heater and
control it's o<font size="+1">utput temperature or
<font size="+1">it just dumps into the space and
the AHU'<font size="+1">s</font> make up the
difference.<br>
<font size="+1">I don't think no heating is <font
size="+1">necessarily out of line for your
climate. You need to get into your sim
file and take a look at what is happening
in finer detail.</font> </font><br>
</font></font></font></font></font></font></font></font><font
size="+1">Bruce Easterbrook P.Eng.<br>
<font size="+1">Abode Engineering<br>
<br>
</font></font></font></font></font>
<div class="moz-cite-prefix">On 09/07/2013 10:45 PM, Sundharam,
Premnath wrote:<br>
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<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 id="Picture_x0020_1"
src="cid:part1.09070602.05040801@bellnet.ca" height="465"
width="750"><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>
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<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>
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