<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 14 (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: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: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";}
p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0in;
margin-right:0in;
margin-bottom:0in;
margin-left:.5in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
span.EmailStyle18
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.EmailStyle19
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.EmailStyle20
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
/* List Definitions */
@list l0
{mso-list-id:664287080;
mso-list-type:hybrid;
mso-list-template-ids:-1216571102 67698703 67698713 67698715 67698703 67698713 67698715 67698703 67698713 67698715;}
@list l0:level1
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level2
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level3
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
@list l0:level4
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level5
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level6
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
@list l0:level7
{mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level8
{mso-level-number-format:alpha-lower;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;}
@list l0:level9
{mso-level-number-format:roman-lower;
mso-level-tab-stop:none;
mso-level-number-position:right;
text-indent:-9.0pt;}
ol
{margin-bottom:0in;}
ul
{margin-bottom:0in;}
--></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=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Hi Nirupama, <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'>So you have a classroom zone that is served by two unit heaters that you’re trying to figure out how to model, and you’re not sure whether their heat source is HW from the boiler because the systems might exceed the boiler capacity. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Based on the systems I’ve worked with, if you are seeing a building fed by HW and baseboards in perimeter zones fed by the same, then the cabinet unit heaters you’re seeing in classrooms are likely HW systems as well. Some MER zones may have electrical resistance heaters for freeze protection, but regularly used zones like classrooms should be on the hot water loop. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Now regarding the boiler capacity, if your systems amount to a whole lot more capacity than the boiler can provide, double check your capacity inputs vs your mechanical schedule. The mechanical design uses “MBH” differently than eQuest, which could potentially trip someone up. (eQuest MBtu/h is 10^6 Btu while the mechanical schedule MBH is 10^3 Btu)<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I’ve modeled schools with similar setups to yours, and I’d recommend modeling the cabinet unit heaters as Fan Coil systems. You can combine the capacity, fan kW, and cfm for the two systems and model it as one. This system can be attached to the hot water loop.<o:p></o:p></span></p><div><p class=MsoNormal><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=MsoNormal><span style='color:#1F497D'>Holt Cutler, EIT, LEED AP BD+C<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'><img width=51 height=60 id="Picture_x0020_1" src="cid:image001.jpg@01CCFABB.7069C4F0" alt="Description: Logo 2"></span><b><i><span style='font-size:8.0pt;color:#1F497D'><o:p></o:p></span></i></b></p><p class=MsoNormal><b><i><span style='font-size:9.0pt;color:#1F497D'>EME Consulting Engineering Group, LLC <o:p></o:p></span></i></b></p><p class=MsoNormal><b><i><span style='font-size:9.0pt;color:#1F497D'>159 West 25<sup>th</sup> Street, 5<sup>th</sup> Floor<o:p></o:p></span></i></b></p><p class=MsoNormal><b><i><span style='font-size:9.0pt;color:#1F497D'>New York, NY 10001<o:p></o:p></span></i></b></p><p class=MsoNormal><b><i><span style='font-size:9.0pt;color:#1F497D'>tel: 212-529-5969<o:p></o:p></span></i></b></p><p class=MsoNormal><b><i><span style='font-size:9.0pt;color:#1F497D'><a href="http://www.emegroup.com/">www.EMEgroup.com</a><o:p></o:p></span></i></b></p><p class=MsoNormal><span style='color:#1F497D'> <o:p></o:p></span></p></div><p class=MsoNormal><span style='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>Jim Grady<br><b>Sent:</b> Friday, March 02, 2012 7:13 PM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] FW: Modeling cabinet/unit heaters<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='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"'> Nirupama Laskminarasimhan <a href="mailto:[mailto:nirupama@lightec.net]">[mailto:nirupama@lightec.net]</a> <br><b>Sent:</b> Friday, March 02, 2012 3:44 PM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Cc:</b> Jodie Lucci; James Michael Grady<br><b>Subject:</b> Modeling cabinet/unit heaters<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’m modeling a school building with unit heaters and cabinet heaters. There is a central boiler serving these heaters. The rest of the school has fin-tube radiation all along its exterior walls. I’m trying to create thermal zones to match the interior space types (classrooms, corridors, etc.). But for classrooms with 2 unit heaters, I’m not sure how a system could be created- <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Can I create a forced air hot water heater that runs on the hot water loop, and specify the BHP of the motor and the cfm’s the fan handles?<o:p></o:p></p><p class=MsoListParagraph> OR<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Baseboards with MBH capacities running on the hot water loop + w/sf on the misc. loads to compensate for the fan electricity consumption?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>If I went ahead with option 1, I would account for the systems, but I do not understand if the heating capacity in MBH for the unit heaters comes from the boiler? (based on the boiler’s capacity)<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>If I went ahead with modeling unit heaters as baseboards with misc. electric load, wouldn’t I run into ventilation issues, as I’m not accounting for the cfm’s of air moved by the fans in these heaters?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Also, can someone tell me how a thermal zone on eQuest behaves? Do the walls of the zone represent the “vertical walls” in the building interior?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thank you.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Nirupama<o:p></o:p></p></div></body></html>