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<P><FONT size=2>All,<BR><BR>I believe it is the RA temperature of the Dummy Zone
that is passed to the units with OA-From specified, so you are right John that
the RA would be too cold to return to an ERV, assuming your dummy space is
something around 55F.<BR><BR>I have spent many a late night trying to work
around this problem and can recommend the following approaches:<BR></FONT><FONT
size=2>1. Model any Energy Recovery as an exceptional calculation (in a separate
model) for LEED<BR>2. Incorporate the Energy Recovery into the FCUs or AHUs
(although you have to be really careful to properly account for your fan energy
and flow rates).<BR><BR>Regards,</FONT></P>
<P><FONT size=2><B><SPAN style="FONT-FAMILY: 'GillSans Light'"><SPAN
style="mso-spacerun: yes"> </SPAN></SPAN></B><B><SPAN
style="COLOR: #4d4d4d; FONT-FAMILY: 'GillSans Light'; mso-bidi-font-size: 10.0pt">Jonathan
M. Curtin, EIT, LEED</SPAN></B><SUP><SPAN
style="FONT-FAMILY: 'GillSans Light'">®</SPAN></SUP><B><SPAN
style="COLOR: #4d4d4d; FONT-FAMILY: 'GillSans Light'; mso-bidi-font-size: 10.0pt">
AP</SPAN></B><B><SPAN
style="COLOR: #4d4d4d; FONT-FAMILY: 'GillSans Light'"><BR></SPAN></B><B><SPAN
style="COLOR: #4d4d4d; FONT-FAMILY: 'GillSans Light'; mso-bidi-font-size: 10.0pt"><SPAN
style="mso-spacerun: yes"> </SPAN></SPAN></B><B><SPAN
style="COLOR: #4d4d4d; FONT-FAMILY: 'GillSans Light'">Mechanical
Engineer</SPAN></B><STRONG><SPAN
style="FONT-FAMILY: 'GillSans Light'"><?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></STRONG></P>
<DIV class=Section1>
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<P>-----Original Message-----<BR>From:
equest-users-bounces@lists.onebuilding.org [<A
href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</A>]
On Behalf Of Grando, John<BR>Sent: Monday, March 01, 2010 03:08 PM<BR>To: James
Hansen; Marcus Eliason; equest-users@lists.onebuilding.org<BR>Subject: Re:
[Equest-users] eQuest - FCU with DOAS<BR><BR><BR>One further question that has
been bothering me. How would you set up ERV with the DOAS? I've seen
some posts from the archives but none are too clear. The return air
temperature of the DOAS appears to be too low to use an ERV on. Any
suggestions?<BR><BR><BR>John Grando LEED AP<BR><BR><BR>-----Original
Message-----<BR>From: James Hansen [<A
href="mailto:JHANSEN@ghtltd.com">mailto:JHANSEN@ghtltd.com</A>]<BR>Sent: Monday,
March 01, 2010 11:16 AM<BR>To: Marcus Eliason;
equest-users@lists.onebuilding.org<BR>Subject: Re: [Equest-users] eQuest - FCU
with DOAS<BR><BR>I haven't had a chance to look at your .inp file, but when you
are creating a DOAS system, make sure that you at least do the
following:<BR><BR>1) Make sure the fan schedule is forced off at night and
setback times.<BR>2) Make sure the throttling range for the dummy zone
thermostat is at least 4 degrees (I usually use 6).<BR>3) Make sure that the
heating/cooling schedules that the dummy zone follows are set to something like
120 degrees cooling and 20 degrees heating after hours, just to make sure that a
call for heating/cooling doesn't show up in your report, and mess up the unmet
load hours.<BR><BR><BR>Just looked at your file: you need to specify some
sort of minimum OA control or minimum air schedule for the FCUs (I think).
Right now nothing shows up.<BR><BR>Also, why is the DOAS system serving so many
"dummy" zones? I *think* your DOAS system is EL1 Sys1 (SZRH), yet it is
serving 20+ zones. I'm confused...<BR><BR>GHT Limited<BR>James Hansen, PE,
LEED AP<BR>Senior Associate<BR>1010 N. Glebe Rd, Suite 200<BR>Arlington,
VA 22201-4749<BR>703-338-5754 (Cell)<BR>703-243-1200
(Office)<BR>703-276-1376 (Fax)<BR>www.ghtltd.com<BR><BR><BR><BR>-----Original
Message-----<BR>From: equest-users-bounces@lists.onebuilding.org [<A
href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</A>]
On Behalf Of Marcus Eliason<BR>Sent: Monday, March 01, 2010 11:04 AM<BR>To:
equest-users@lists.onebuilding.org<BR>Subject: [Equest-users] eQuest - FCU with
DOAS<BR><BR><BR>Hello,<BR><BR>I am trying to model a building with FCUs and a
DOAS to deliver outdoor air to the individual zones. I have put in the
dummy zones for the DOAS system, modeled as a single air handler with chilled
and hot water coils. I have changed the walls of the dummy zone to air walls,
specified the DOAS to get OA flow as sum of all zones and for the FCUs to get OA
from the DOAS. When I run the model, I get a lot of unmet hours
corresponding to the dummy zones and the DOAS system. I have tried but
cannot seem to turn off the return air path for the DOAS (since it is 100% OA)
and have specified the minimum OA fraction for the DOAS as 1. I am not
sure if the unmet hours means that my DOAS is not adequately cooling the OA load
or if it something else.<BR>Also, my "pump & aux" energy in the model seems
very high for a building that only has 3 pumps. Can someone familiar with
modeling DOAS shed any light on what might be causing some of these
problems. I have attached the .inp and .pd2 files for
reference.<BR><BR>Thanks,<BR><BR>Marcus Eliason<BR><BR><BR><BR>The information
contained in this communication is confidential, may be privileged, and is
intended only for the use of the addressee. It is the property of GHT
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