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<DIV dir=ltr align=left><FONT face=Arial><FONT color=#0000ff><FONT
size=2>Hi Janne,</FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT color=#0000ff><FONT
size=2></FONT></FONT></FONT> </DIV>
<DIV><FONT><FONT><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=390103516-19012009>T</SPAN><SPAN class=390103516-19012009>his appears
to be a bug in equest - free cooling should override DCV. I ran into
the same problem a few months ago, and found no solution other than
post-processing hourly report
data.</SPAN></FONT></FONT></FONT></FONT></FONT></DIV>
<DIV><FONT><FONT><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=390103516-19012009></SPAN></FONT></FONT></FONT></FONT></FONT> </DIV>
<DIV><FONT><FONT><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=390103516-19012009>Shaun</SPAN></FONT></FONT></FONT></FONT></FONT></DIV>
<DIV><FONT><FONT><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=390103516-19012009></SPAN></FONT></FONT></FONT></FONT></FONT> </DIV>
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<P class=MsoNormal><EM><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Shaun Martin LEED
AP<o:p></o:p></SPAN></EM></P>
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style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Principal<o:p></o:p></SPAN></EM></P>
<P class=MsoNormal><EM><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Shaun Martin
Consulting</SPAN></EM><SPAN style="FONT-SIZE: 10pt"><o:p></o:p></SPAN></P>
<P class=MsoNormal><st1:Street w:st="on"><st1:address w:st="on"><EM><SPAN
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604-789-1095</SPAN></EM><SPAN
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<P class=MsoNormal><EM><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">e:smartin@shaunmartinconsulting.com</SPAN></EM><SPAN
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<P class=MsoNormal><SPAN class=GramE><EM><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">member</SPAN></EM></SPAN><EM><SPAN
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ASHRAE</SPAN></EM><SPAN
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<FONT face=Tahoma size=2><B>From:</B> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Kairento,
Janne<BR><B>Sent:</B> Thursday, January 15, 2009 12:28 PM<BR><B>To:</B>
bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> [Bldg-sim] DCV and Enthalpy
Economizer<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hi All,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">I’m currently working on a model
that has CO2 sensing in a few large high occupancy spaces. When I select DCV
Return Sensor with a minimum OA sizing method of ‘Sum of Zone OA’, it drives up
the energy consumption of my electric centrifugal open chillers during the
winter months (this is in climate zone 5A). But without the DCV Return Sensor,
there is no space cooling energy consumption during the winter months. It
appears as if the DCV Return Sensor is overriding the Enthalpy Economizer with a
drybulb high limit of 70F. Does anyone have any insight into what is
happening?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thank
You,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Janne<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><B><FONT face="Times New Roman" size=3><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 12pt">Janne Kairento, E.I.T., LEED
AP</SPAN></FONT></B> <BR><B><I><FONT color=blue size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; COLOR: blue; FONT-STYLE: italic">Cosentini
Associates</SPAN></FONT></I></B> <o:p></o:p></P>
<P class=MsoNormal><B><FONT face="Times New Roman" color=blue size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; COLOR: blue">A Tetra Tech
Company</SPAN></FONT></B><FONT color=black size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: black"> </SPAN></FONT><FONT color=blue
size=2><SPAN style="FONT-SIZE: 10pt; COLOR: blue">| Complex World, Clear
Solutions</SPAN></FONT><FONT color=black size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: black"> </SPAN></FONT><o:p></o:p></P>
<P class=MsoNormal><FONT face="Times New Roman" color=gray size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: gray">One Broadway</SPAN></FONT> <BR><FONT
size=2><SPAN style="FONT-SIZE: 10pt"><ns0:place
w:endInsDate="2009-01-15T15:27:00Z" w:endInsAuthor="janne.kairento"
w:insDate="2009-01-15T15:27:00Z" w:insAuthor="janne.kairento"><ns0:City
w:endInsDate="2009-01-15T15:27:00Z" w:endInsAuthor="janne.kairento"
w:insDate="2009-01-15T15:27:00Z" w:insAuthor="janne.kairento"><st1:place
w:st="on"><st1:City w:st="on"><FONT color=gray><SPAN
style="COLOR: gray">Cambridge</SPAN></FONT></st1:City></ns0:City></st1:place><FONT
color=gray><SPAN style="COLOR: gray">, </SPAN></FONT><ns0:State
w:endInsDate="2009-01-15T15:27:00Z" w:endInsAuthor="janne.kairento"
w:insDate="2009-01-15T15:27:00Z" w:insAuthor="janne.kairento"><st1:State
w:st="on"><FONT color=gray><SPAN
style="COLOR: gray">MA</SPAN></FONT></st1:State></ns0:State><FONT
color=gray><SPAN style="COLOR: gray"> </SPAN></FONT><ns0:PostalCode
w:endInsDate="2009-01-15T15:27:00Z" w:endInsAuthor="janne.kairento"
w:insDate="2009-01-15T15:27:00Z" w:insAuthor="janne.kairento"><st1:PostalCode
w:st="on"><FONT color=gray><SPAN
style="COLOR: gray">02142</SPAN></FONT></st1:PostalCode></ns0:PostalCode></ns0:place></SPAN></FONT>
<BR><FONT color=gray size=2><SPAN style="FONT-SIZE: 10pt; COLOR: gray">Phone:
617.494.9090</SPAN></FONT> <BR><FONT color=gray size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: gray">Fax: 617.494.9292</SPAN></FONT>
<o:p></o:p></P>
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