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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#0025C4'>It’s an interesting conundrum that the times that MRT
becomes a significant player in the comfort calculation is when there is an
uneven radiant field (hot or cold window; fireplace; thermal mass wall). In
such a situation, is it fair to average out the MRT for an entire room? Don’t
your view factors change drastically depending on your position in the room? <o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#0025C4'>Does one person too hot near the window and another person too
cold on the inside equal thermal comfort? <o:p></o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
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bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Peter
Simmonds<br>
<b>Sent:</b> Tuesday, April 21, 2009 1:36 PM<br>
<b>To:</b> Timothy Moore; Karen Walkerman; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] MRT Tool<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>I do not think the thermal comfort tool calculates the MRT it is a
user input.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
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<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Peter
Simmonds. Ph.D.</span><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:gray'><br>
Senior Associate, Advanced Technology Group<br>
<br>
</span><span style='font-family:"Arial","sans-serif";color:gray'>IBE Consulting
Engineers</span><span style='color:gray'><br>
</span><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:gray'>14130 Riverside Drive Suite 201</span><span style='font-size:7.5pt;
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</span><span style='font-size:7.5pt;font-family:"Arial","sans-serif";
color:gray'>Sherman Oaks, CA 91423<br>
p: (818) 377-8220 ext. 246<br>
f: (818) 377-8230<br>
m: (818) 219-1284<o:p></o:p></span></p>
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<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"'> Timothy Moore
[mailto:timothy.moore@iesve.com] <br>
<b>Sent:</b> Tuesday, April 21, 2009 10:00 AM<br>
<b>To:</b> Karen Walkerman; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] MRT Tool</span><o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Karen,<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 ASHRAE-55 Thermal Comfort Tool created by the UC Berkeley
Center for the Built Environment and available from ASHRAE publications (if I
recall correctly) includes a very easy-to-use MRT calculator for rectangular
rooms. It allows for MRT at a particular position in that room, separate
surface temperatures and dimensions for surfaces, and also the inclusion of a
“panel” or other area within one of the walls (such as a cold/hot
window, heating panel, etc.) that has a distinct temperature. This is part of a
very handy tool for determining PPD, etc. based upon the typical range of human
thermal comfort variables (clo value, activity level, air temp, MRT, humidity,
air movement).<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'>Cheers,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Timothy<o:p></o:p></span></p>
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<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"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Karen
Walkerman<br>
<b>Sent:</b> Tuesday, April 21, 2009 9:50 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] MRT Tool<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hello,<br>
<br>
Is anyone aware of a simple Mean Radiant Temperature calculation tool?
I'm looking for something that will calculate MRT for a basic rectangular room.<br>
<br>
Thanks!<br>
<br>
--<br>
Karen<o:p></o:p></p>
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