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<p class="MsoNormal"><span style="color:#1F497D">Paul,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Your reviewer may have thought that if the slab was showing up as an “exterior surface” (such as on the LV-D report) than the model was simulating heat transfer between the zones and the outside air through the
slab. But eQUEST/DOE-2 simulates heat transfer across underground surfaces differently, as described in the UNDERGROUND-WALL and UNDERGROUND-FLOOR section of the DOE-2 help documentation. The main difference is that ground temperature is used instead of the
OA temperature as the outside temperature. The monthly ground temperature is taken from the weather file, or can be entered as SITE-PARAMETERS:GROUND-T.<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">The eQUEST wizard creates custom constructions for each underground surface based on inputs for Exterior/Cavity Insulation and Perimeter Floor Insulation. Underground floors are given constructions with low U-factor
(high R-value) consistent with the lower heat transfer that would be expected.<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">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">~Bill<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:black">William Bishop, PE, BEMP, BEAP, CEM, LEED AP
</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:#006600">|</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:black"> Pathfinder Engineers & Architects LLP<o:p></o:p></span></b></p>
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<p class="MsoNormal" style="line-height:105%"><b><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black">Senior Energy Engineer<o:p></o:p></span></b></p>
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<p class="MsoNormal" style="line-height:105%"><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black"><img width="56" height="38" id="Picture_x0020_4" src="cid:image007.jpg@01D39C38.6333FF10">
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<p class="MsoNormal" style="line-height:105%"><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#1F497D">134 South Fitzhugh Street</span><span style="font-size:9.0pt;line-height:105%;color:#1F497D">
</span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#1F497D">Rochester, NY 14608<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:105%"><b><i><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#002060">T: (585) 698-1956</span></i></b><b><i><span style="color:#002060">
</span></i></b><span style="color:#1F497D"> </span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#1F497D">F: (585) 325-6005</span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:105%"><span style="color:#1F497D"><a href="mailto:wbishop@pathfinder-ea.com"><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:blue">bbishop@pathfinder-ea.com</span></a></span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black">
</span><span style="color:#1F497D"><a href="http://www.pathfinder-ea.com/"><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:blue">www.pathfinder-ea.com</span></a><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-top:3.0pt;line-height:105%"><span style="color:#1F497D"><img border="0" width="34" height="32" id="Picture_x0020_5" src="cid:image009.png@01D39C38.6333FF10" alt="http://png-5.findicons.com/files/icons/977/rrze/720/globe.png"></span><span style="font-size:7.5pt;line-height:105%;color:#00B0F0">Carbon
Fee and Dividend - simple, effective, and market-based.</span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Equest-users [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Nathan Miller via Equest-users<br>
<b>Sent:</b> Friday, February 02, 2018 2:35 PM<br>
<b>To:</b> Nathan Miller <nathanm@rushingco.com>; Paul Diglio <paul.diglio@sbcglobal.net>; equest-users@onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Slab on Grade Floor Heat Loss<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Fixed my typo in the F-factor heat loss calc (should have read 50 ft of perimeter)… See below.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:1.0pt;margin-right:0in;margin-bottom:4.0pt;margin-left:0in">
<b><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:#6F1200">Nathan Miller, PE, LEED AP BD+C</span></b><b><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:#632423"> –
</span></b><i><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:black">Mechanical Engineer/Senior Energy Analyst</span></i><b><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:#632423"><o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-top:3.0pt;line-height:115%"><b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#6F1200">RUSHING</span></b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F">
</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:black">|</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F">
</span><b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#6F1200">O</span></b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#A50021">
</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:black">206-285-7100 |</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F">
</span><b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#6F1200">C</span></b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#A50021">
</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:black">207-650-3942</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:115%"><b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#6F1200"><a href="http://www.rushingco.com/"><span style="color:#6F1200">www.rushingco.com</span></a></span></b><b><span style="font-size:9.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#6F1200"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Equest-users [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Nathan Miller via Equest-users<br>
<b>Sent:</b> Friday, February 2, 2018 2:33 PM<br>
<b>To:</b> Paul Diglio <<a href="mailto:paul.diglio@sbcglobal.net">paul.diglio@sbcglobal.net</a>>;
<a href="mailto:equest-users@onebuilding.org">equest-users@onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Slab on Grade Floor Heat Loss<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In the past I’ve done a conversion of F-factor (perimeter based) slab-on-grade heat loss to U-factor (area) and input that in on a zone-by-zone basis if I really wanted to nail down SOG heat loss.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Example- Space is 20’ x 30’, but the exposed perimeter is only two of the faces (20’ + 30’). Lets say it is uninsulated SOG.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">F-factor from 90.1: F = 0.73 Btu/(hr*ft*F)<br>
<br>
Perimeter based heat loss: 0.73 Btu/(hr*ft*F) * 50 ft = 36.5 BTU/(hr *F)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Then we can back-calculate the U-factor to assume for the whole floor to equate to that heat loss: 36.5 BTU/(hr *F) = 600 SF * X BTU/(hr*SF*F) -> U = 0.0608 BTU/(hr*SF*F)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">You can create a custom floor construction for each space to provide the U-factor to produce equivalent heat loss that the F-factor calcs are telling you lose. For purely core zones (no exposed perimeter), I guess the F-factor calcs are
telling us were not really losing heat through that slab (doesn’t’ seem right, but it probably is relatively small)
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<b><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:#6F1200">Nathan Miller, PE, LEED AP BD+C</span></b><b><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:#632423"> –
</span></b><i><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:black">Mechanical Engineer/Senior Energy Analyst</span></i><b><span style="font-size:9.0pt;font-family:"Verdana",sans-serif;color:#632423"><o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-top:3.0pt;line-height:115%"><b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#6F1200">RUSHING</span></b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F">
</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:black">|</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F">
</span><b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#6F1200">O</span></b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#A50021">
</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:black">206-285-7100 |</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F">
</span><b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#6F1200">C</span></b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#A50021">
</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:black">207-650-3942</span><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#BFAB7F"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:115%"><b><span style="font-size:8.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#6F1200"><a href="https://url.emailprotection.link/?a6X-5ry0mOOudUi-eMfQ7K9LfplwNoMV9idJhgEyf85c~"><span style="color:#6F1200">www.rushingco.com</span></a></span></b><b><span style="font-size:9.0pt;line-height:115%;font-family:"Verdana",sans-serif;color:#6F1200"><o:p></o:p></span></b></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> Equest-users [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Paul Diglio via Equest-users<br>
<b>Sent:</b> Friday, February 2, 2018 2:19 PM<br>
<b>To:</b> <a href="mailto:equest-users@onebuilding.org">equest-users@onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Slab on Grade Floor Heat Loss<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<div id="yui_3_16_0_ym19_1_1517591308519_11245">
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:"Helvetica Neue";color:black">I recently submitted a model to the local utility company for an incentive. Part of the buildings' first floor is slab on grade.<o:p></o:p></span></p>
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<div id="yui_3_16_0_ym19_1_1517591308519_11310">
<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-size:12.0pt;font-family:"Helvetica Neue";color:black"><o:p> </o:p></span></p>
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<div id="yui_3_16_0_ym19_1_1517591308519_11309">
<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-size:12.0pt;font-family:"Helvetica Neue";color:black">One of the comments I received back is that this erroneously shows up as an exterior surface and I should delete all the
slab on grade floors in the component tree. Doesn't seem right to me.<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-size:12.0pt;font-family:"Helvetica Neue";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:"Helvetica Neue";color:black">I did a few and it does reduce the overall energy consumption. In the 3D model, no floors show, just open to the interior of the zone.<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-size:12.0pt;font-family:"Helvetica Neue";color:black"><o:p> </o:p></span></p>
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<div id="yui_3_16_0_ym19_1_1517591308519_11373">
<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-size:12.0pt;font-family:"Helvetica Neue";color:black">So is eQuest assuming that without this floor, there is no heat loss out the bottom of the zone? Is this reasonable?<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-size:12.0pt;font-family:"Helvetica Neue";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:"Helvetica Neue";color:black">Thank you,<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:"Helvetica Neue";color:black"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><span style="font-size:12.0pt;font-family:"Helvetica Neue";color:black">Paul Diglio<o:p></o:p></span></p>
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