<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]-->
<title>VAV with Electric Reheat</title>
<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:Consolas;
panose-1:2 11 6 9 2 2 4 3 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
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p
{mso-style-priority:99;
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","serif";}
pre
{mso-style-priority:99;
mso-style-link:"HTML Preformatted Char";
margin:0in;
margin-bottom:.0001pt;
font-size:10.0pt;
font-family:"Courier New";}
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";}
span.balloontextchar0
{mso-style-name:balloontextchar;
mso-style-priority:99;
font-family:"Tahoma","sans-serif";}
span.emailstyle20
{mso-style-name:emailstyle20;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.emailstyle22
{mso-style-name:emailstyle22;
font-family:"Arial","sans-serif";
color:navy;}
span.HTMLPreformattedChar
{mso-style-name:"HTML Preformatted Char";
mso-style-priority:99;
mso-style-link:"HTML Preformatted";
font-family:Consolas;}
span.EmailStyle25
{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="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=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Omar,<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'>I have a few comments. First of all, when I opened your file I
got many warnings stating that the windows were not positioned correctly. I am
using a modified eQUEST version of 3.63 supplied in a training from Marlin
Addison. You may not receive the warnings depending on what version you are
using. You may want to double check your window placements.<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'>I have provided screen shots of air handler 1. I made the
following modifications and it appeared to run correctly.<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'>Also, I would recommend having an experienced modeler to review
you model when it is finished since this is your first one and there appears to
be many small items that could be improved. <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'><img width=469 height=351 id="Picture_x0020_4"
src="cid:image001.jpg@01CB2A6A.0ABE6160"></span><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'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img width=437 height=327 id="Picture_x0020_11"
src="cid:image002.jpg@01CB2A6A.0ABE6160"></span><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'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img width=469 height=351 id="Picture_x0020_18"
src="cid:image003.jpg@01CB2A6A.0ABE6160"></span><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'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>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'>Otto<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>
<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"'> Omar Katanani
[mailto:omar@ecoconsulting.net] <br>
<b>Sent:</b> Friday, July 23, 2010 12:48 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] VAV with Electric Reheat<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Otto, it didn’t work!</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'> </span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Dear all,</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'> </span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>I discovered that the parameter “Hot Deck Max Leaving
Temp” is necessary in order to activate the main heating coil! If left to
default, only the reheat coils will operate.</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'> </span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Back to my case, where I had electric reheat. When I didn’t
specify the “Hot Deck Max Leaving Temp”, the hot water loop had
zero flow because it wasn’t activated (and hence the error).</span><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Now when I specified a value of 70F, I got rid of the error, but
the whole heating (99.9%) was electric, and a very small 0.1% was due to the
hot water loop.</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'> </span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>A possible percentage of space heating sources is 80% hot water
loop, 20% electric reheat coil. (or any other reasonable percentage).</span><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'> </span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>I played a lot with the “reheat delta temp” and the
“Hot Deck Max Leaving Temp”, the results slightly varied (change in
the fuel consumption of space heat, but still negligible compared to the
electric portion.</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'> </span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Any recommendations? I attach my files just in case…</span><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'> </span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Many thanks,</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Omar</span><span lang=EN-GB><o:p></o:p></span></p>
<div>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>___________________________</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Omar Katanani<br>
Sustainable Design Engineer</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Email: <a href="mailto:omar@ecoconsulting.net">omar@ecoconsulting.net</a></span><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='color:navy'> </span><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:navy'>EcoConsulting (Lebanon)</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:navy'>Nahas Building, 4<sup>th</sup> floor</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:navy'>4 St-Maron Street / Georges Haddad Avenue</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:navy'>Postal Code: 2028 5806 SAIFI</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:navy'>Beirut, Lebanon</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:navy'>Tel: </span><span
lang=EN-GB style='font-size:7.5pt;font-family:"Arial","sans-serif";color:navy'>+961
(0) 1 971 255<br>
Mobile: +961 (0) 3 045 045</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='color:navy'> </span><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:navy'>EcoConsulting (UK) Ltd<br>
28 Marshalsea Road<br>
London, SE1 1HF<br>
Tel: +44 (0) 207 939 0989<br>
Fax: +44 (0) 207 939 0981</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:navy'>Website: <a href="http://www.ecoconsulting.net/">www.ecoconsulting.net</a></span><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB style='color:navy'> </span><span
lang=EN-GB><o:p></o:p></span></p>
<p style='margin:0in;margin-bottom:.0001pt'><span lang=EN-GB style='font-size:
10.0pt;font-family:"Arial","sans-serif";color:navy'> <img border=0
width=870 height=102 id="_x0000_i1025" src="cid:image010.jpg@01CB2A69.246D8100"></span><span
lang=EN-GB><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>-----Original
Message-----<br>
<b>From:</b> Otto Schwieterman [mailto:oschwieterman@fhai.com] <br>
<b>Sent:</b> 21 July 2010 17:56<br>
<b>To:</b> Omar Katanani; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> RE: [Equest-users] VAV with Electric Reheat</span><span
lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Omar,</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>You can try using a pre-heat coil as your hot water coil in the
air handler and the electric heat in your re-heat coil.</span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img border=0 width=536 height=401 id="Picture_x0020_1"
src="cid:image011.jpg@01CB2A69.246D8100"></span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img border=0 width=539 height=403 id="Picture_x0020_2"
src="cid:image012.jpg@01CB2A69.246D8100"></span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> </span><span lang=EN-GB><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"'> Omar Katanani
[mailto:omar@ecoconsulting.net] <br>
<b>Sent:</b> Wednesday, July 21, 2010 10:06 AM<br>
<b>To:</b> Omar Katanani; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] VAV with Electric Reheat</span><span lang=EN-GB><o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal> <span lang=EN-GB><o:p></o:p></span></p>
<p class=MsoNormal> <span lang=EN-GB><o:p></o:p></span></p>
<p style='margin-bottom:12.0pt'><span style='font-size:10.0pt'>Dear all,<br>
<br>
I'm sorry I've been nagging a lot lately, but believe me, you guys are my only
support!<br>
<br>
I was using a VAV system, with the reheat source being the hot water loop. I
specified the Reheat delta temperature by trial and error to 25F. Everything is
fine.<br>
<br>
Now I got updated info from the client saying that the source of the reheat is
electric. I am getting an error message:<br>
<br>
"Hot Water Loop has zero design flow. Check input for consistency,
or specify design loads."<br>
<br>
I read a couple of discussions. I understand that many factors will affect this
issue. The "Hot Deck Maximum Supply Temp", the "Reheat Delta
Temp", and the "Zone Entering Max Supply Temp".<br>
<br>
I tried specifying the hot deck max supply temp to 70F, I got the results
attached in the pdf. However, the gas consumption part of the space heating is
negligible compared to the electric, while I thought both will be of
significant ratios!<br>
<br>
My main question is how to get reasonable results, knowing that the main
heating source is the hot water loop, and the electric reheat is to fine tune
the temperature of zones experiencing different loads or so...<br>
<br>
I know that the design temperature of the zones is 70F, and that the
temperature that is supplied to the zone should be 30 degrees higher than the
zone temperature (70+30=100F).<br>
<br>
Any advice on how to choose the "reheat delta temp" and the "hot
deck maximum supply temp", or any other input parameter you feel that it
affects, is greatly appreciated.<br>
<br>
Many thanks,<br>
Omar<br>
___________________________<br>
<br>
Omar Katanani<br>
Sustainable Design Engineer<br>
Email: omar@ecoconsulting.net<br>
<br>
<br>
EcoConsulting (Lebanon)<br>
Nahas Building, 4th floor<br>
4 St-Maron Street / Georges Haddad Avenue<br>
Postal Code: 2028 5806 SAIFI<br>
Beirut, Lebanon<br>
Tel: +961 (0) 1 971 255<br>
Mobile: +961 (0) 3 045 045<br>
<br>
<br>
EcoConsulting (UK) Ltd<br>
28 Marshalsea Road<br>
London, SE1 1HF<br>
Tel: +44 (0)207 939 0989<br>
Fax: +44 (0)207 939 0981<br>
Website: www.ecoconsulting.net<br>
<br>
<br>
<br>
-----Original Message-----<br>
From: Omar Katanani<br>
Sent: Thu 7/15/2010 11:44 AM<br>
To: equest-users@lists.onebuilding.org<br>
Subject: VAV with Electric Reheat<br>
<br>
<br>
Dear all,<br>
<br>
I was using a VAV system, with the reheat source being the hot water loop. I
specified the Reheat delta temperature by trial and error to 20F. Everything is
fine.<br>
<br>
Now I got updated info from the client saying that the source of the reheat is
electric. I am getting an error message:<br>
<br>
"Hot Water Loop has zero design flow. Check input for consistency,
or specify design loads."<br>
<br>
I read a couple of discussions. I understand that many factors will affect this
issue. The "Hot Deck Maximum Supply Temp", the "Reheat Delta
Temp", and the "Zone Entering Max Supply Temp".<br>
<br>
First of all, is the sum of the first two equal to the third?<br>
<br>
My main question is how to get reasonable results, knowing that the main
heating source is the hot water loop, and the electric reheat is just to fine
tune the temperature of zones experiencing different loads or so...<br>
<br>
I played with all values but I can't figure out the pattern. I know that the
design temperature of the zones is 70F, and that the temperature that is
supplied to the zone should be 30 degrees higher than the zone temperature
(70+30=100F).<br>
<br>
Any advice on how to choose the "reheat delta temp" and the "hot
deck maximum supply temp" is greatly appreciated.<br>
<br>
Many thanks,<br>
Omar<br>
<br>
<br>
___________________________<br>
<br>
Omar Katanani<br>
Sustainable Design Engineer<br>
Email: omar@ecoconsulting.net<br>
<br>
<br>
EcoConsulting (Lebanon)<br>
Nahas Building, 4th floor<br>
4 St-Maron Street / Georges Haddad Avenue<br>
Postal Code: 2028 5806 SAIFI<br>
Beirut, Lebanon<br>
Tel: +961 (0) 1 971 255<br>
Mobile: +961 (0) 3 045 045<br>
<br>
<br>
EcoConsulting (UK) Ltd<br>
28 Marshalsea Road<br>
London, SE1 1HF<br>
Tel: +44 (0)207 939 0989<br>
Fax: +44 (0)207 939 0981<br>
Website: www.ecoconsulting.net</span><span lang=EN-GB><o:p></o:p></span></p>
<pre>________________________________________________________________________________________<o:p></o:p></pre><pre>Fanning/Howey Associates, Inc. intends to send this transmission (including any attachments) only to the<o:p></o:p></pre><pre>designated individual or entity. If you received this message in error, please notify the sender by replying<o:p></o:p></pre><pre>to the electronic mail (if electronic) or by telephone at the number indicated on this document.<o:p></o:p></pre><pre>Fanning/Howey Associates, Inc. has taken reasonable precautions to ensure no viruses are present in the<o:p></o:p></pre><pre>electronic mail. Fanning/Howey Associates, Inc., will not accept responsibility for any loss or damage arising<o:p></o:p></pre><pre>from the use of this electronic mail or attachments. Use, disclosure, dissemination, distribution, or reproduction<o:p></o:p></pre><pre>of this message by unintended recipients is not authorized and maybe unlawful. Any information included in<o:p></o:p></pre><pre>this transmission that is not related to contracts with our authorization, verbal or written, by Fanning/Howey<o:p></o:p></pre><pre>Associates, Inc. may not be covered by our professional liability insurance.<o:p></o:p></pre></div>
</body>
</html>
<pre>________________________________________________________________________________________
Fanning/Howey Associates, Inc. intends to send this transmission (including any attachments) only to the
designated individual or entity. If you received this message in error, please notify the sender by replying
to the electronic mail (if electronic) or by telephone at the number indicated on this document.
Fanning/Howey Associates, Inc. has taken reasonable precautions to ensure no viruses are present in the
electronic mail. Fanning/Howey Associates, Inc., will not accept responsibility for any loss or damage arising
from the use of this electronic mail or attachments. Use, disclosure, dissemination, distribution, or reproduction
of this message by unintended recipients is not authorized and maybe unlawful. Any information included in
this transmission that is not related to contracts with our authorization, verbal or written, by Fanning/Howey
Associates, Inc. may not be covered by our professional liability insurance.