<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:13px"><div id="yui_3_16_0_ym19_1_1559113417870_5751"><span>Thank you for the detailed reply.</span></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 13px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif; font-size: 16px;"> <div dir="ltr"><font size="2" face="Arial"> On Wednesday, 29 May 2019 2:43 AM, Nicholas Caton <Nicholas.Caton@se.com> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div id="yiv0410933120"><style>#yiv0410933120 #yiv0410933120 --
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<div class="yiv0410933120MsoNormal">The advent of explicit DOAS system modeling with the most recent eQuest build presents some new opportunities that we didn’t have previously for handling radiant slab systems. To add to your assertions around fan coil fan energies, ventilation
loads and fans were still something to consider and account for – now we can handle those explicitly as a separate system!</div>
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<div class="yiv0410933120MsoNormal">The key thing to continue considering in modeling radiant heating/cooling slabs/beams in eQuest is the fundamentals around a doe2 zone being assumed as fully/perfectly mixed at all times, whereas radiant systems by their nature need to
consider buoyancy effects and loads in relation to comfort zones (in elevation), relative to the total zone volume. This is a gap to bridge in consideration of how to structure your model so that the assumptions of design regarding loads incident on the system
are in alignment. A tool in your belt here is that you can reduce the conditioned volume of your zones by playing with the geometric height. Alternatively/additionally, you have inputs available to rigorously specify/adjust the fraction of internal loads
incident on the conditioned volume.</div>
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<div class="yiv0410933120MsoNormal">I think autosizing the airside system cooling capacity and airflow rates remains generally acceptable practice, but you should probably minimally make time to check and reign in the hydronic cooling capacity observed at the associated plant
chiller(s). If the goals of the model extend to/include accurately assessing comfort criteria, I might however make a point to further assess and limit cooling capacity in each zone based upon the radiant slab/beam design criteria.</div>
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<div class="yiv0410933120MsoNormal">In all this though, folks simulating radiant systems today can be thankful they don’t have to “layer in” a DOAS approximation on top of the usual shenanigans!</div>
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<div class="yiv0410933120MsoNormal">~Nick</div>
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<div class="yiv0410933120MsoNormal"><b><span style="">Nick Caton, P.E., BEMP</span></b><span style="color:#3A7A46;"></span></div>
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<div class="yiv0410933120MsoNormal"><span style="font-size:9.0pt;"> Senior Energy Engineer</span><span style="font-size:9.0pt;"><br clear="none">
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<div class="yiv0410933120MsoNormal"><u><span style="font-size:9.0pt;"><a rel="nofollow" shape="rect" ymailto="mailto:nicholas.caton@se.com" target="_blank" href="mailto:nicholas.caton@se.com"><span style="">nicholas.caton@se.com</span></a></span></u><span style="font-size:9.0pt;color:#1F497D;"></span></div>
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<div class="yiv0410933120MsoNormal"><b>From:</b> Equest-users <equest-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Rathna Shree via Equest-users<br clear="none">
<b>Sent:</b> Tuesday, May 28, 2019 5:40 AM<br clear="none">
<b>To:</b> equest-users@lists.onebuilding.org<br clear="none">
<b>Subject:</b> [Equest-users] Radiant slab cooling in Equest</div>
</div>
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<div class="yiv0410933120MsoNormal"> </div>
<div><span style="color:red;">[External email: Use caution with links and attachments]</span></div>
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<div id="yiv0410933120yui_3_16_0_ym19_1_1559039654490_12652">
<div class="yiv0410933120MsoNormal" style="background:white;"><span style="font-size:10.0pt;">Dear All,</span></div>
</div>
<div id="yiv0410933120yui_3_16_0_ym19_1_1559039654490_12652">
<div class="yiv0410933120MsoNormal" style="background:white;"><span style="font-size:10.0pt;"> </span></div>
</div>
<div id="yiv0410933120yui_3_16_0_ym19_1_1559039654490_12652">
<div class="yiv0410933120MsoNormal" style="background:white;"><span style="font-size:10.0pt;">I read a lot of posts regarding this subject. Since Equest is not capable of directly modeling Radiant cooling, the work around would
be to model with a Fan coil unit with fan energy at 0 Kw/cfm. The question is, what should be the supply air CFM and cooling capacity of FCU that should be modeled. Should it be left to autosize?</span></div>
</div>
<div id="yiv0410933120yui_3_16_0_ym19_1_1559039654490_12652">
<div class="yiv0410933120MsoNormal" style="background:white;"><span style="font-size:10.0pt;"> </span></div>
</div>
<div id="yiv0410933120yui_3_16_0_ym19_1_1559039654490_12652">
<div class="yiv0410933120MsoNormal" style="background:white;"><span style="font-size:10.0pt;">Looking forward for a right modeling approach.</span></div>
</div>
<div id="yiv0410933120yui_3_16_0_ym19_1_1559039654490_12652">
<div class="yiv0410933120MsoNormal" style="background:white;"><span style="font-size:10.0pt;"> </span></div>
</div>
<div id="yiv0410933120yui_3_16_0_ym19_1_1559039654490_12652">
<div class="yiv0410933120MsoNormal" style="background:white;"><span style="font-size:10.0pt;">Thank you.</span></div>
</div>
<div id="yiv0410933120yui_3_16_0_ym19_1_1559039654490_12652">
<div class="yiv0410933120MsoNormal" style="background:white;"><span style="font-size:10.0pt;"> </span></div>
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<div id="yiv0410933120yui_3_16_0_ym19_1_1559039654490_12652">
<div class="yiv0410933120MsoNormal" style="background:white;"><span style="font-size:10.0pt;">Regards,</span></div>
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<div id="yiv0410933120yui_3_16_0_ym19_1_1559039654490_12652">
<div class="yiv0410933120MsoNormal" style="background:white;"><span style="font-size:10.0pt;">Rathnashree</span></div>
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