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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Bill, I have successfully managed to get
rid of the ERV cooling increase by increasing the OA-DT to about 20 F and using
the “only run during heating mode” function. Why I don’t
know. My guess is that the smaller the OA-DT, the more chances the
controls have of over shooting their cooling set points which then adds to the total
cooling energy consumption. <o:p></o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Robby Oylear<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, August 01, 2011 1:22
PM<br>
<b><span style='font-weight:bold'>To:</span></b> Bishop, Bill<br>
<b><span style='font-weight:bold'>Cc:</span></b> equest-users@lists.onebuilding.org;
Bill Lafley<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users] Heat
Recovery</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>To piggy back onto this discussion, I've been having trouble with a
heat recovery system that's increasing the cooling energy of my system. I
can understand that under certain control schemes, this might actually be the
case, but even when I set the control method to OA-DT and select that the ERV
will only run during heating operation, the end result is still an increase in
cooling. <o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Does anyone have any insight into what could be causing this?<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Thanks,<o:p></o:p></span></font></p>
</div>
<div>
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minor-fareast'> AP BD+C</span></span></font></b><o:p></o:p></p>
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line-height:115%'><font size=3 face="Times New Roman"><span style='font-size:
12.0pt;line-height:115%'><a href="http://www.rushingco.com/"><b><i><span
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face=Verdana><span style='font-size:8.0pt;line-height:115%;font-family:Verdana;
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Mon, Aug 1, 2011 at 6:13 AM, Bishop, Bill <<a
href="mailto:wbishop@pathfinder-ea.com">wbishop@pathfinder-ea.com</a>>
wrote:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Bill,<br>
<br>
There should always be at least a slight increase in fan energy when you<br>
add heat recovery to a system, leaving everything else equal (duct size,<br>
cabinet size, airflow rate etc.). By default, eQUEST adds either 1.5" or<br>
1.0" static pressure (depending on the ERV device type you select) to<br>
both the make-up and exhaust air streams. The extra static is added to<br>
the system supply and return fans, unless you create separate<br>
"self-contained" ERV-FANS under the system Outdoor Air -> Heat
Recovery<br>
2 tab. If you don't have separate fans in the ERV/HRV, and you know what<br>
the total static pressure of the system is with heat recovery included,<br>
you can enter the system SUPPLY-STATIC under Fans -> Fan Power and<br>
Control, and zero out the ERV-OA-STATIC and ERV-EXH-STATIC.<br>
<br>
If the heat recovery system is not designed yet and you are running<br>
what-if scenarios, try different control strategies under system Outdoor<br>
Air -> Heat Recovery 1, ERV-RUN-CTRL and ERV-RECOVER-MODE. Optimizing<br>
the control strategy will help you find the best balance between fan<br>
energy penalty, cooling energy savings/penalty and heating energy<br>
savings.<br>
<br>
Regards,<br>
Bill<br>
<br>
<br>
-----Original Message-----<br>
From: <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a><br>
[mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>]
On Behalf Of Bill<br>
Lafley<br>
Sent: Saturday, July 30, 2011 1:34 PM<br>
To: <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
Subject: [Equest-users] Heat Recovery<o:p></o:p></span></font></p>
<div>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
Hello,<br>
<br>
When I add heat recovery to my proposed model the natural gas usage<br>
drops significantly but the vent fan electrical usage skyrockets to<br>
almost 6 times the base vent fan usage without heat recovery. I<br>
searched the archives and tried adjusting down the in W.G. but it does<br>
not seem to reduce it. Is there something else I should be looking at?<br>
<br>
Thanks,<br>
<br>
<<a href="http://www.cetonline.org" target="_blank">http://www.cetonline.org</a>><br>
<br>
Bill Lafley <mailto:<a href="mailto:blafley@cetonline.org">blafley@cetonline.org</a>>
| Energy Analyst<br>
Center for EcoTechnology<br>
<<a href="http://www.cetonline.org" target="_blank">http://www.cetonline.org</a>><br>
<<a href="http://www.cetonline.org/Mailist/VR_Signup.php" target="_blank">http://www.cetonline.org/Mailist/VR_Signup.php</a>><br>
<br>
<br>
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