<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:x="urn:schemas-microsoft-com:office:excel" xmlns:p="urn:schemas-microsoft-com:office:powerpoint" xmlns:a="urn:schemas-microsoft-com:office:access" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns:b="urn:schemas-microsoft-com:office:publisher" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:odc="urn:schemas-microsoft-com:office:odc" xmlns:oa="urn:schemas-microsoft-com:office:activation" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:q="http://schemas.xmlsoap.org/soap/envelope/" xmlns:rtc="http://microsoft.com/officenet/conferencing" xmlns:D="DAV:" xmlns:Repl="http://schemas.microsoft.com/repl/" xmlns:mt="http://schemas.microsoft.com/sharepoint/soap/meetings/" xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ppda="http://www.passport.com/NameSpace.xsd" xmlns:ois="http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir="http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:dsp="http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc="http://schemas.microsoft.com/data/udc" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sub="http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec="http://www.w3.org/2001/04/xmlenc#" xmlns:sp="http://schemas.microsoft.com/sharepoint/" xmlns:sps="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:udcs="http://schemas.microsoft.com/data/udc/soap" xmlns:udcxf="http://schemas.microsoft.com/data/udc/xmlfile" xmlns:udcp2p="http://schemas.microsoft.com/data/udc/parttopart" xmlns:wf="http://schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:dsss="http://schemas.microsoft.com/office/2006/digsig-setup" xmlns:dssi="http://schemas.microsoft.com/office/2006/digsig" xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" xmlns:mver="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:mrels="http://schemas.openxmlformats.org/package/2006/relationships" xmlns:spwp="http://microsoft.com/sharepoint/webpartpages" xmlns:ex12t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ex12m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:pptsl="http://schemas.microsoft.com/sharepoint/soap/SlideLibrary/" xmlns:spsl="http://microsoft.com/webservices/SharePointPortalServer/PublishedLinksService" xmlns:Z="urn:schemas-microsoft-com:" xmlns:st="" 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:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@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;}
@font-face
{font-family:"Stylus BT";
panose-1:2 14 4 2 2 2 6 2 3 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Balloon Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";}
p.Normal, li.Normal, div.Normal
{mso-style-name:"\[Normal\]";
margin:0in;
margin-bottom:.0001pt;
text-autospace:none;
font-size:12.0pt;
font-family:"Arial","sans-serif";}
span.EmailStyle20
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.EmailStyle21
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.Section1
{page:Section1;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</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=Section1>
<p class=MsoNormal><span style='color:#1F497D'>Hi everyone,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I’ve got what I believe to
be a working preliminary model of a DOAS system. I’m following the DOAS
concept (prescribed by previous archived discussions) of creating a
“dummy zone/shell” to be served by the DOAS equipment. All terminal
units are tied to the DOAS via <u>OA-FROM-SYSTEM</u>. My DOAS is based on
the system type SZRH (“Single Zone Air Handler with HW reheat”).
<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>This DOAS is assigned to a
1ft-cube “dummy shell” with a single zone, adiabatic ceiling/floor
constructions, wall constructions of U=.0001, and zeroed-out internal loads.
Conceptually, I believe the airflow for the DOAS should be calculated as the
hourly sum of all the terminal unit’s calculated OA needs. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I’ve got three basic
questions, presented in order of (perceived) difficulty:<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>QUESTION 1)<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>As I’ve set my “dummy”
zone’s walls to U=0.0001, and of physically tiny dimensions, I don’t
think there’s much to worry about regarding heat gains/losses. In
the interest of doing the intuitively “right” thing however, is
there a way to set their “surface type” as adiabatic in the same
way as roof and floor surfaces? Is perhaps the cleanest way to deal with
all three to create “adiabatic” constructions, and if so how do you
get around the error (see attached image) when you input U=0?<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>QUESTION 2) <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Every system (DOAS and terminal
units) currently has the <u>MIN-OA-METHOD</u> set as <u>FRACTION-OF-DESIGN</u>,
per the warning below. In reality, the hourly OA supplied by the DOAS
will be calculated by summing what is being called for by all of the terminal
units, which will be based on local DCV sensors in the return air path of each
unit. Unfortunately, setting any of the terminal units’ <u>MIN-OA-METHOD</u>
to the intuitive <u>DCV-RETURN-SENSOR</u> results in the following warning (typical
for each system):<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:#C0504D'>**WARNING**********************************************************************<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:#C0504D'>
EL1 Sys1 (FC)
(G.N1)
has a MIN-AIR-SCH, OA-CONTROL<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:#C0504D'>
other than FIXED and/or a MIN-OA-METHOD other than FRACTION-OF-DESIGN<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:#C0504D'>
along with having a specified OA-FROM-SYSTEM. This may cause incorrect<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Courier New";color:#C0504D'>
OA load/flow calculation for its OA-FROM-SYSTEM.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I’ve gathered that one
approach to this problem is to manually define the design airflow of the DOAS,
based on summing the critical case of OA required by digging through the
reports (not sure where to begin there), but is there any way of tricking
eQuest into correctly summing the hourly OA CFM required by all terminal units
tied to the DOAS, and then sizing the DOAS system based on that critical sum?<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>QUESTION 3)<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>The following are the remaining
3 warnings, all referring to this “dummy zone</span><span
style='color:#1F497D'>:”</span><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'>**WARNING**********************************************************************<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'>
Zone: EL2 Zn
(G.1)
has a design cooling<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'>
temperature differential of only 1.0F. This<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'>
may result in an extremely large design airflow.<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'><o:p> </o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'> **WARNING**********************************************************************<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'>
Zone: EL2 Zn
(G.1)
has a design heating<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'>
temperature differential of only -1.0F. This<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'>
may result in an extremely large design airflow.<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'><o:p> </o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'> **WARNING**********************************************************************<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'>
ZONE EL2 Zn
(G.1)
<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'>
might have insufficient heating capability.<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'>
Check that the SYSTEM or ZONE HEATING-CAPACITY plus this<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'>
ZONEs BASEBOARD-RATING is adequate to maintain the ZONE<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'>
specified DESIGN-HEAT-T for the calculated peak ZONE load<o:p></o:p></span></p>
<p class=Normal><span style='font-size:8.0pt;font-family:"Courier New";
color:#C0504D'>
(see LS-A or LS-B for the ZONE peak load.)<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Which (if any) of these I should
be addressing/evaluating, considering the modeling function of this
“dummy zone?” In other words, can I ignore these and sleep
well at night? =)<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><img width=119 height=37 id="Picture_x0020_1"
src="cid:image001.jpg@01CA3C69.A8A4DD90" alt="cid:489575314@22072009-0ABB"><b><span
style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-size:12.0pt;
font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;color:#CC9900'>PROJECT ENGINEER</span><span
style='font-size:7.5pt;font-family:"Times New Roman","serif";color:#CC9900'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>25501 west
valley parkway<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>olathe ks 66061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>direct 913
344.0036<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>fax 913
345.0617<o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;color:#2D4D5E'>Check out
our new web-site @ </span></i><span style='color:#1F497D'><a
href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span
style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span
style='font-size:10.0pt;color:blue'> </span></u><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
</div>
</body>
</html>