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<DIV><SPAN class=640553613-08062012><FONT color=#0000ff face=Calibri>Following
up on my earlier question, it seems like you have the plenums in their
respective conditioned zones in the design case, but the base case still
shows</FONT></SPAN></DIV>
<DIV><SPAN class=640553613-08062012><FONT color=#0000ff face=Calibri>them all
under their own separate system and at indoor design temps similar to the
conditioned zones.</FONT></SPAN></DIV>
<DIV><SPAN class=640553613-08062012><FONT color=#0000ff
face=Calibri></FONT></SPAN> </DIV>
<DIV><SPAN class=640553613-08062012><FONT color=#0000ff
face=Calibri></FONT></SPAN> </DIV>
<DIV>
<HR tabIndex=-1>
</DIV>
<DIV><FONT size=2 face=Tahoma><B>From:</B> Armstrong, Jamie
[mailto:JArmstrong@dbrinc.com] <BR><B>Sent:</B> Friday, June 08, 2012 9:14
AM<BR><B>To:</B> Umesh Atre; 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">I’ve
finally got the unmet hours under control but my heating costs are more in my
design than my baseline. I’m shooting for 24% increase in efficiency and
I’m at 4 now.<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">My
design system is a PSZ with natural gas heat. <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:640553613@08062012-3798" 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"> Umesh Atre
[mailto:umesh@innovativedesign.net] <BR><B>Sent:</B> Friday, June 08, 2012 8:00
AM<BR><B>To:</B> Armstrong, Jamie; Howe, Timothy;
equest-users@lists.onebuilding.org<BR><B>Subject:</B> RE: [Equest-users] 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 class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: blue">Jamie,</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: blue">Is there a reason you
have all the plenum spaces on their own separate system with indoor design
temperatures similar to your conditioned zones?</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<DIV style="TEXT-ALIGN: center" class=MsoNormal align=center>
<HR align=center SIZE=2 width="100%">
</DIV>
<P style="MARGIN-BOTTOM: 12pt" 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"> <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
6:20 PM<BR><B>To:</B> Howe, Timothy; <A
href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</A><BR><B>Subject:</B>
Re: [Equest-users] Can't get unmet hours under control for
cooling</SPAN><o:p></o:p></P>
<DIV>
<P style="mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"
class=MsoNormal>In regards to OA for PSZ RTU’s. <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>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></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>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></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>
<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_i1026 border=0
alt="Description: Description: image001" src="cid:640553613@08062012-379F"
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></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><B>From:</B> Howe, Timothy [<A
href="mailto:Timothy.Howe@stantec.com">mailto:Timothy.Howe@stantec.com</A>]
<BR><B>Sent:</B> Thursday, June 07, 2012 3:51 PM<BR><B>To:</B> Armstrong, Jamie;
<A
href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</A><BR><B>Subject:</B>
RE: 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>
<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_i1027 border=0 src="cid:640553613@08062012-37A6"
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_i1028 border=0 src="cid:640553613@08062012-37AD"
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_i1029 border=0
alt="Description: Description: image001" src="cid:640553613@08062012-379F"
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"
class=MsoNormal><o:p> </o:p></P></DIV></DIV></DIV></BODY></HTML>