<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:st1="urn:schemas-microsoft-com:office:smarttags" xmlns="http://www.w3.org/TR/REC-html40"
xmlns:ns0="urn:schemas-microsoft-com:office:smarttags">
<head>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 11 (filtered medium)">
<o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="PostalCode"/>
<o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="State"/>
<o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="City"/>
<o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags"
name="place"/>
<!--[if !mso]>
<style>
st1\:*{behavior:url(#default#ieooui) }
</style>
<![endif]-->
<style>
<!--
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline;}
p
{mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:12.0pt;
font-family:"Times New Roman";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:Arial;
color:windowtext;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.25in 1.0in 1.25in;}
div.Section1
{page:Section1;}
-->
</style>
</head>
<body lang=EN-US link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi All,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
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 size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thank You,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Janne<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><b><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-weight:bold'>Janne Kairento, E.I.T., LEED AP</span></font></b>
<br>
<b><i><font size=2 color=blue><span style='font-size:10.0pt;color:blue;
font-weight:bold;font-style:italic'>Cosentini Associates</span></font></i></b> <o:p></o:p></p>
<p class=MsoNormal><b><font size=2 color=blue face="Times New Roman"><span
style='font-size:10.0pt;color:blue;font-weight:bold'>A Tetra Tech Company</span></font></b><font
size=2 color=black><span style='font-size:10.0pt;color:black'> </span></font><font
size=2 color=blue><span style='font-size:10.0pt;color:blue'>| Complex World,
Clear Solutions</span></font><font size=2 color=black><span style='font-size:
10.0pt;color:black'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=gray face="Times New Roman"><span
style='font-size:10.0pt;color:gray'>One Broadway</span></font> <br>
<font size=2><span style='font-size:10.0pt'><ns0:place
w:insAuthor="janne.kairento" w:insDate="2009-01-15T15:20:00Z"
w:endInsAuthor="janne.kairento" w:endInsDate="2009-01-15T15:20:00Z"><ns0:City
w:insAuthor="janne.kairento" w:insDate="2009-01-15T15:20:00Z"
w:endInsAuthor="janne.kairento" w:endInsDate="2009-01-15T15:20:00Z"><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:insAuthor="janne.kairento" w:insDate="2009-01-15T15:20:00Z"
w:endInsAuthor="janne.kairento" w:endInsDate="2009-01-15T15:20:00Z"><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:insAuthor="janne.kairento" w:insDate="2009-01-15T15:20:00Z"
w:endInsAuthor="janne.kairento" w:endInsDate="2009-01-15T15:20:00Z"><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 size=2 color=gray><span style='font-size:10.0pt;color:gray'>Phone:
617.494.9090</span></font> <br>
<font size=2 color=gray><span style='font-size:10.0pt;color:gray'>Fax:
617.494.9292</span></font> <o:p></o:p></p>
<p><b><font size=2 color=green face="Times New Roman"><span style='font-size:
10.0pt;color:green;font-weight:bold'>Please consider the environment before
printing this e-mail</span></font><o:p></o:p></b></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<br clear=all> NOTICE OF CONFIDENTIALITY
This E-mail message and its attachments (if any) are intended solely for the use of the addressees hereof. In addition, this message and the attachments (if any) may contain information that is confidential, privileged and exempt from disclosure under applicable law. If you are not the intended recipient of this message, you are prohibited from reading, disclosing, reproducing, distributing, disseminating or otherwise using this transmission. Delivery of this message to any person other than the intended recipient is not intended to waive any right or privilege. If you have received this message in error, please promptly notify the sender by reply E-mail and immediately delete this message from your system.
</body>
</html>