<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 12 (filtered medium)">
<!--[if !mso]>
<style>
v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style>
<![endif]-->
<style>
<!--
/* Font Definitions */
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:12.0pt;
font-family:"Times New Roman","serif";}
a:link, span.MsoHyperlink
{color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal;
font-family:"Arial","sans-serif";
color:windowtext;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.25in 1.0in 1.25in;}
div.WordSection1
{page:WordSection1;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="2050" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=EN-US link=blue vlink=purple>
<div class=WordSection1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>It’s possible that you are ok, but a lot of variables need
to be aligned.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The building location (climate/exposures), use, occupancy
schedule and ventilation rates all play a big part in determining whether the
shortcut is valid. I don’t usually have that much good luck.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The big variable is whether you will actually need reheat and
what is driving the need for reheat. If you’ve determined you will
need reheat then the simplification will usually underestimate the amount of cooling
and airflow required, since the model will only return the average cooling load
instead of the overcooling/reheat that occurs in some of the zones. The degree
of this underestimate will depend on the variables mentioned earlier and how
the space ends up being zoned.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";
color:black'> <o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial","sans-serif";
color:black'>Michael Hardy, PE, F.NSPE</span><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Black Oak Engineering, Inc.</span><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><br>
</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Cell 503.314.5244</span><span style='font-size:11.0pt;font-family:
"Calibri","sans-serif";color:#1F497D'> <o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Gajewski,
David<br>
<b>Sent:</b> Monday, August 30, 2010 11:54 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Overcooling<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I
have modeled a building with DX rooftop units. In an effort to save time,
I have zoned the building per rooftop. Am I creating a problem by having
only one zone per rooftop if I designate that rooftop as a VAV system without
reheat? I am cooling often down to 64-65 degrees when I have a setpoint
of 70. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>David<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><!--[if gte vml 1]><v:shapetype id="_x0000_t75" coordsize="21600,21600"
o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f"
stroked="f">
<v:stroke joinstyle="miter" />
<v:formulas>
<v:f eqn="if lineDrawn pixelLineWidth 0" />
<v:f eqn="sum @0 1 0" />
<v:f eqn="sum 0 0 @1" />
<v:f eqn="prod @2 1 2" />
<v:f eqn="prod @3 21600 pixelWidth" />
<v:f eqn="prod @3 21600 pixelHeight" />
<v:f eqn="sum @0 0 1" />
<v:f eqn="prod @6 1 2" />
<v:f eqn="prod @7 21600 pixelWidth" />
<v:f eqn="sum @8 21600 0" />
<v:f eqn="prod @7 21600 pixelHeight" />
<v:f eqn="sum @10 21600 0" />
</v:formulas>
<v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect" />
<o:lock v:ext="edit" aspectratio="t" />
</v:shapetype><v:shape id="_x0000_s1026" type="#_x0000_t75" style='position:absolute;
margin-left:0;margin-top:1.35pt;width:474.95pt;height:89.25pt;z-index:-1'>
<v:imagedata src="cid:image001.gif@01CB488A.D02A4930" o:title="logo-murphy"
gain="19661f" blacklevel="22938f" />
</v:shape><![endif]--><![if !vml]><span style='mso-ignore:vglayout;position:
absolute;z-index:-1;margin-left:0px;margin-top:2px;width:633px;height:119px'><img
width=633 height=119 src="cid:image003.jpg@01CB488A.D02A4930" v:shapes="_x0000_s1026"></span><![endif]><b><span
style='font-size:16.0pt;font-family:"Arial","sans-serif";color:navy'>David
Gajewski</span></b><b><span style='font-family:"Arial","sans-serif";color:navy'>,
CEM</span></b><b><span style='font-size:16.0pt;font-family:"Arial","sans-serif";
color:navy'><br>
</span></b><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Energy Solutions Division</span></b><b><span style='font-size:16.0pt;
font-family:"Arial","sans-serif";color:navy'><br>
</span></b><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Murphy Company</span></b><b><span style='font-size:16.0pt;
font-family:"Arial","sans-serif";color:navy'><br>
</span></b><b><span lang=EN style='font-size:10.0pt;font-family:Wingdings;
color:green'>(</span></b><b><span lang=EN style='font-size:10.0pt;font-family:
Wingdings;color:#FF6600'> </span></b><b><span lang=EN style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'>Direct: (</span></b><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>314)
692-1541</span></b><b><span style='font-size:16.0pt;font-family:"Arial","sans-serif";
color:navy'><br>
</span></b><b><span lang=EN style='font-size:10.0pt;font-family:Wingdings;
color:green'>(</span></b><b><span lang=EN style='font-size:10.0pt;font-family:
Wingdings;color:#FF6600'> </span></b><b><span lang=EN style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'>Mobile: (</span></b><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>314)
220-4281<br>
</span></b><b><span lang=EN style='font-size:10.0pt;font-family:Wingdings;
color:green'>(</span></b><b><span lang=EN style='font-size:10.0pt;font-family:
Wingdings;color:#FF6600'> </span></b><b><span lang=EN style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'>Main: (</span></b><b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>314)
997-6600</span></b><b><span style='font-size:16.0pt;font-family:"Arial","sans-serif";
color:navy'><br>
</span></b><b><span lang=EN style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Web: <a href="http://www.murphynet.com/"
title="http://www.murphynet.com/">www.murphynet.com</a></span></b> <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
</div>
</body>
</html>