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. <div>
<br></div><div>Does anyone have any insight into what could be causing this?</div><div><br></div><div>Thanks,</div><div><p class="MsoNormal" style="margin-top:1.0pt"><a name="_MailAutoSig"><b><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";mso-fareast-font-family:
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<p class="MsoNormal" style="line-height:115%"><span style="mso-bookmark:_MailAutoSig"></span><a href="http://www.rushingco.com/"><span style="mso-bookmark:_MailAutoSig"><b><i><span style="font-size:8.0pt;mso-bidi-font-size:11.0pt;line-height:115%;font-family:
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color:#1F497D;mso-no-proof:yes"></span></span></p><br><div class="gmail_quote">On Mon, Aug 1, 2011 at 6:13 AM, Bishop, Bill <span dir="ltr"><<a href="mailto:wbishop@pathfinder-ea.com">wbishop@pathfinder-ea.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">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<br>
<div><div></div><div class="h5"><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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