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<DIV>Thank you Nick, Patrick, and the other responders. I’m back on track
now and experimenting with delta-T.</DIV>
<DIV> </DIV>
<DIV>Best to you,</DIV>
<DIV> </DIV>
<DIV>Dave</DIV>
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<DIV> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A title=ncaton@smithboucher.com
href="mailto:ncaton@smithboucher.com">Nick Caton</A> </DIV>
<DIV><B>Sent:</B> Thursday, February 27, 2014 10:07 AM</DIV>
<DIV><B>To:</B> <A title=poleary1969@gmail.com
href="mailto:poleary1969@gmail.com">Patrick J. O'Leary, Jr.</A> ; <A
title=Dave.Weigel@thewattdoctors.com
href="mailto:Dave.Weigel@thewattdoctors.com">The Watt Doctors - Dave Weigel</A>
</DIV>
<DIV><B>Cc:</B> <A title=equest-users@lists.onebuilding.org
href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</A>
</DIV>
<DIV><B>Subject:</B> RE: [Equest-users] Strange ERV Error and
Results</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<P class=MsoNormal><SPAN style="COLOR: #1f497d">I have the vague impression that
“maximum tracked changes” messages have something to do with the user interface
and do not generally seem to affect an actual simulation (erroneous
warnings). I’ve encountered the same warning across many projects without
any apparent detrimental effects.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">I don’t think I’ve seen this
warning addressed in any official capacity however, so it would be prudent to
maintain a backup of your project prior to or immediately after receiving this
message for the first time, and take note of what change evoked that response,
in case you later want to backtrack. <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">I’d reinforce Patrick’s
response, and also layer on to consider pressure drop / fan heat while you’re at
it… Fred Betz summarized this pretty well a few months ago
(attached). It’s tempting to assume a cooling energy “jump” must be solely
caused by additional outside air loads, when adding ERV, but your fans working
harder can easily be a good chunk of that figure as well.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">~Nick<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN> </P>
<DIV>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><IMG id=Picture_x0020_1
alt=cid:489575314@22072009-0ABB
src="cid:9E99FF81AB6840A3ADCC13082FBE3AA5@DaveHPDesktop" width=119
height=37></SPAN><B><SPAN
style="FONT-FAMILY: 'Stylus BT','sans-serif'; COLOR: #2d4d5e"><o:p></o:p></SPAN></B></P>
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Stylus BT','sans-serif'; COLOR: #2d4d5e"><o:p></o:p></SPAN></B> </P>
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Stylus BT','sans-serif'; COLOR: #2d4d5e">NICK
CATON, P.E.<o:p></o:p></SPAN></B></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 7.5pt; COLOR: #cc9900">SENIOR
ENGINEER<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 7.5pt; COLOR: #cc9900"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #2d4d5e">Smith &
Boucher Engineers</SPAN><SPAN
style="FONT-SIZE: 7.5pt; FONT-FAMILY: 'Times New Roman','serif'; COLOR: #cc9900"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #2d4d5e">25501 west
valley parkway, suite 200<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #2d4d5e">olathe, ks
66061<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #2d4d5e">direct
913.344.0036<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10pt; COLOR: #2d4d5e">fax
913.345.0617<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><A
title=blocked::www.smithboucher.com href="wlmailhtml:www.smithboucher.com"><SPAN
style="FONT-SIZE: 10pt">www.smithboucher.com</SPAN></A></SPAN><U><SPAN
style="FONT-SIZE: 10pt; COLOR: blue"> </SPAN></U><SPAN
style="COLOR: #1f497d"><o:p></o:p></SPAN></P></DIV>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p></o:p></SPAN> </P>
<DIV>
<DIV
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<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: windowtext">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: windowtext">
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Patrick
J. O'Leary, Jr.<BR><B>Sent:</B> Thursday, February 27, 2014 5:34
AM<BR><B>To:</B> The Watt Doctors - Dave Weigel<BR><B>Cc:</B>
equest-users@lists.onebuilding.org<BR><B>Subject:</B> Re: [Equest-users] Strange
ERV Error and Results<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p></o:p> </P>
<P class=MsoNormal>how is the erv controlled? if you take the default on
when ahu supply fan unit is on then it will cost you more energy as the erv runs
continuously even when there is a) no advantage to do so, and b) when it is
detrimental to do so. try changing control to a delta t between exhaust
air and outside air temp via a eem & play with the delta. my
experience in southern arizona is that a 27 d t is optimum where i am
at.<BR><BR>On 2/27/14 2:17 AM, The Watt Doctors - Dave Weigel wrote:
<o:p></o:p></P>
<DIV>
<DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Hi
Group,<o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">My system is a simple
VAV. When I click to add an ERV, it ties up my machine completely for about 3-4
minutes and then throws up the error for “maximum number of tracked changes
exceeded.” But it accepts the ERV and lets me configure it. This
results in a vast decrease in heating energy, but a large increase in cooling
energy. Weather is Atlanta. I don’t understand why cooling energy would
increase with the simple addition of an ERV.<o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Any thoughts?
<o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Thanks!<o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"> <o:p></o:p></SPAN></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Dave<o:p></o:p></SPAN></P></DIV></DIV></DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"><BR><BR><BR><o:p></o:p></SPAN></P><PRE>_______________________________________________<o:p></o:p></PRE><PRE>Equest-users mailing list<o:p></o:p></PRE><PRE><A href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</A><o:p></o:p></PRE><PRE>To unsubscribe from this mailing list send a blank message to <A href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</A><o:p></o:p></PRE>
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