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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Doug, <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 very recently came across the same problem but haven’t been
able to solve it either. If you haven’t tried it already, one workaround you
might consider is to set the COOLING‑SCHEDULE with OA temperatures below which
cooling is unavailable. This will mitigate the winter cooling you are seeing.
In my case it appears pretty helpful in making up for the bug but I haven’t
looked at this approach enough to know for certain that it doesn’t cause any
undesirable affects.<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>
<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'>Billy Vreeland<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>DMI<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>35 Walnut Street<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Wellesley, MA 02481<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>(p) 781.431.1100 x 23<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>(f) 781.431.1109<o:p></o:p></span></p>
</div>
<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-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Doug
Maddox<br>
<b>Sent:</b> Wednesday, July 16, 2008 3:19 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] heat recovery bug<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I
think I found a bug with the ERV feature in eQuest related to temperature
control. My input is as follows:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
RECOVER-EXHAUST = YES<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
ERV-RECOVER-TYPE = ENTHALPY-WHEEL<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
ERV-SENSIBLE-EFF = 0.75<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
ERV-LATENT-EFF = 0.75<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
ERV-RUN-CTRL = OA-EXHAUST-DT<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
ERV-TEMP-CTRL = MIXED-AIR-RESET<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
ERV-CAP-CTRL = MODULATE-HX<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
ERV-HX-KW = 0.207<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
ERV-FANS = HVAC-SUPPLY/RETURN <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
ERV-OA-STATIC = 0.5<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
ERV-EXH-STATIC = 0.5<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
ERV-FROST-CTRL = USE-CAP-CTRL<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>The
system shows heating savings as expected, and cooling savings during summer
periods, but during winter there is a large cooling penalty. Hourly
reports show an unexpected cooling load during winter night mode
operation. If I set ERV-OA-STATIC to zero, that cooling load goes away.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>If
I change to a fan located in the ERV, the unexpected cooling load is still
absent:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
ERV-FANS = SELF-CONTAINED<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>
ERV-EXH-KW/FLOW = 0.002<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thus,
it appears that the heat gain due to friction in the heat wheel is not taken
into account for the OA setpoint during night mode when ERV-FANS =
HVAC-SUPPLY/RETURN. Has anyone else seen this problem?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>The
SELF-CONTAINED option appears to be a work-around, but it is not as convenient
for add-on heat wheels.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks,<o:p></o:p></span></p>
<p><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>Doug Maddox,
PE</span><o:p></o:p></p>
<p><span style='font-size:11.0pt;font-family:"BankGothic Md BT"'>THE WEIDT
GROUP</span><br>
<img width=32 height=40 id="_x0000_i1025"
src="cid:image001.gif@01C8E762.BF26C720"> <br>
<span style='font-size:10.0pt'><ns0:Street w:insAuthor="DougM"
w:insDate="2008-07-16T14:52:00Z" w:endInsAuthor="DougM"
w:endInsDate="2008-07-16T14:52:00Z"><ns0:address w:insAuthor="DougM"
w:insDate="2008-07-16T14:52:00Z" w:endInsAuthor="DougM"
w:endInsDate="2008-07-16T14:52:00Z"><span style='font-size:9.0pt;font-family:
"Arial","sans-serif"'>5800 Baker Road</span><span class=msoIns><ins
cite="mailto:DougM" datetime="2008-07-16T14:52"></ns0:address></ins></span></ns0:Street></span><br>
<span style='font-size:10.0pt'><ns0:place w:insAuthor="DougM"
w:insDate="2008-07-16T14:52:00Z" w:endInsAuthor="DougM"
w:endInsDate="2008-07-16T14:52:00Z"><ns0:City w:insAuthor="DougM"
w:insDate="2008-07-16T14:52:00Z" w:endInsAuthor="DougM"
w:endInsDate="2008-07-16T14:52:00Z"><span style='font-size:9.0pt;font-family:
"Arial","sans-serif"'>Minnetonka</span><span class=msoIns><ins
cite="mailto:DougM" datetime="2008-07-16T14:52"></ns0:City></ins></span><span
style='font-size:9.0pt;font-family:"Arial","sans-serif"'>, </span><ns0:State
w:insAuthor="DougM" w:insDate="2008-07-16T14:52:00Z" w:endInsAuthor="DougM"
w:endInsDate="2008-07-16T14:52:00Z"><span style='font-size:9.0pt;font-family:
"Arial","sans-serif"'>MN</span><span class=msoIns><ins cite="mailto:DougM"
datetime="2008-07-16T14:52"></ns0:State></ins></span><span style='font-size:
9.0pt;font-family:"Arial","sans-serif"'> </span><ns0:PostalCode
w:insAuthor="DougM" w:insDate="2008-07-16T14:52:00Z" w:endInsAuthor="DougM"
w:endInsDate="2008-07-16T14:52:00Z"><span style='font-size:9.0pt;font-family:
"Arial","sans-serif"'>55345</span><span class=msoIns><ins cite="mailto:DougM"
datetime="2008-07-16T14:52"></ns0:PostalCode></ins></span></ns0:place></span><br>
<span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>T 802-262-1033<br>
F 952.938.1480<br>
<a href="blocked::http://www.twgi.com/" title="blocked::http://www.twgi.com/">www.twgi.com</a><br>
<a href="blocked::mailto:DougM@twgi.com" title="blocked::mailto:DougM@twgi.com">DougM@twgi.com</a></span><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
</div>
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