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<DIV><FONT color=#0000ff face=Calibri><SPAN
class=771065112-08062012>Jamie,</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Calibri><SPAN class=771065112-08062012>Is there a
reason you have all the plenum spaces on their own separate system with
indoor design temperatures similar to your </SPAN></FONT><FONT
color=#0000ff face=Calibri><SPAN class=771065112-08062012>conditioned
zones?</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Calibri><SPAN
class=771065112-08062012></SPAN></FONT><FONT color=#0000ff face=Calibri><SPAN
class=771065112-08062012></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff size=2 face=Arial></FONT> </DIV>
<DIV><FONT color=#0000ff size=2 face=Arial></FONT> </DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <B>On Behalf Of
</B>Armstrong, Jamie<BR><B>Sent:</B> Thursday, June 07, 2012 6:20
PM<BR><B>To:</B> Howe, Timothy;
equest-users@lists.onebuilding.org<BR><B>Subject:</B> Re: [Equest-users] Can't
get unmet hours under control for cooling<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=WordSection1>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">In
regards to OA for PSZ RTU’s. <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">When
allowing eQuest to autosize the airflow to each space if you set a ratio of OA
to supply air whatever eQuest calculates the supply air needed for that space
will vary the outside airflow.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">If
I enter the OA at the zone level to each space how do you set up a schedule for
the OA? Based on Timothy’s answer I would need a different schedule for
each RTU with its ratio of OA to supply air. I wanted the MinOA schedule
to be an on/off flag to deliver the OA that I put in at the zone level according
to the occupied schedule.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<DIV>
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Verdana','sans-serif'; COLOR: #404040">Jamie Armstrong
</SPAN></B><SPAN
style="FONT-FAMILY: 'Verdana','sans-serif'; COLOR: #404040; FONT-SIZE: 10pt">P.E.</SPAN><B><SPAN
style="FONT-FAMILY: 'Verdana','sans-serif'; COLOR: #404040"><BR></SPAN></B><SPAN
style="FONT-FAMILY: 'Verdana','sans-serif'; COLOR: #404040; FONT-SIZE: 10pt">Mechanical
Engineer<BR><BR><IMG id=Picture_x0020_1 alt="Description: Description: image001"
src="cid:771065112@08062012-377C" width=264 height=53><BR><BR>v. 210.546.0200 |
www.dbrinc.com</SPAN><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #404040; FONT-SIZE: 11pt"><o:p></o:p></SPAN></P></DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt"> Howe, Timothy
[mailto:Timothy.Howe@stantec.com] <BR><B>Sent:</B> Thursday, June 07, 2012 3:51
PM<BR><B>To:</B> Armstrong, Jamie;
equest-users@lists.onebuilding.org<BR><B>Subject:</B> RE: Can't get unmet hours
under control for cooling<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<DIV>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal>Jamie,<o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal>You have some inconsistencies in your inputs for the OA on
system RTU-2 (and all the rest). See highlighted area below. You are
saying that the system is 100% recirc by setting the Minimum Outside Air ratio
to 0.00, but your Minimum Air Schedule (note that this is a fraction of the
design supply CFM type of input) is saying otherwise and takes precedence
causing it to be a 100% OA system. See my snip from the hourly reports
below too. You need to develop the proper ventilation rates for each
system and verify with hourly reports. Do not rely on the summary tab in
the air side system tab of eQUEST to give you correct data at all times.
If you just define the OA by using the Minimum Outside Air ratio,
you will be supplying OA every time the fan operates. To prevent this you
need to set up Minimum Air Schedule for each system which is based upon the
proper fractions for that system. <o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><IMG id=_x0000_i1025 src="cid:771065112@08062012-3783" width=531
height=448><o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><IMG id=_x0000_i1026 src="cid:771065112@08062012-378A"
width=1024 height=661><o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<DIV>
<DIV>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><B>Timothy Howe, MS, LEED® AP BD+C</B><BR>Mechanical
Engineer<BR>Stantec<o:p></o:p></P></DIV>
<DIV>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal>61 Commercial Street<BR>Rochester NY
14614<BR>Ph: (585) 413-5347<BR>Fx: (585)
272-1814<BR>Cell: (585) 330-8681<o:p></o:p></P></DIV>
<DIV>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><A href="http://www.stantec.com"><B>stantec</B>.com</A>
<o:p></o:p></P></DIV>
<DIV>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal>The content of this email is the confidential property of
Stantec and should not be copied, modified, retransmitted, or used for any
purpose except with Stantec's written authorization. If you are not the intended
recipient, please delete all copies and notify us
immediately.<o:p></o:p></P></DIV>
<DIV>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P></DIV></DIV>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal>ü Please consider the environment before printing this
email. <o:p></o:p></P>
<DIV>
<DIV>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><B>From:</B> <A
href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</A>
[<A
href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</A>]
<B>On Behalf Of </B>Armstrong, Jamie<BR><B>Sent:</B> Thursday, June 07, 2012
4:23 PM<BR><B>To:</B> <A
href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</A><BR><B>Subject:</B>
[Equest-users] Can't get unmet hours under control for
cooling<o:p></o:p></P></DIV></DIV>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal>I need some help getting these cooling unmet hours under
control. I have to get this model complete and submitted by
tonight.<o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal>We’ve tried multiple things to try to get the model to work
out. <o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal>We’ve tried the following:<o:p></o:p></P>
<P class=MsoListParagraph>·
Letting eQuest autosize the heating and cooling for the PSZ units<o:p></o:p></P>
<P class=MsoListParagraph>·
Verified that the schedules are consistent with both cooling, heating, and
occupancy.<o:p></o:p></P>
<P class=MsoListParagraph>· On
the baseline building we have the min cfm set to 0.5 for most spaces and 1
cfm/sf for some of the larger spaces.<o:p></o:p></P>
<P class=MsoListParagraph>· We
set the PSZ –fan – flow parameter – indoor fan mode to intermittent to get the
unit to show partial capacity thru out the days.<o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal>One item is RTU-2 in my model. It serves only one
space. We have a high amount of unmet hours on this and we are letting it
auto size the capacity and airflow and it still says its not staying under
control. We’re assuming that we are missing one small check box that’s
somehow causing these unmet hours.<o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal>I’ve attached the pd2 files for both baseline and proposed along
with weather data and inp files.<o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal>Thanks in advance for any help!<o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><o:p> </o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal><B>Jamie Armstrong </B>P.E.<B><BR></B>Mechanical
Engineer<BR><BR><IMG id=_x0000_i1027 border=0
alt="Description: Description: image001" src="cid:771065112@08062012-3791"
width=264 height=53><BR><BR>v. 210.546.0200 | <A
href="http://www.dbrinc.com">www.dbrinc.com</A><o:p></o:p></P>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
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