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<p class="MsoNormal">Hello Bldg Sim Folks,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Could anyone comment on how they “translate” the F-factor requirement for on grade slabs into a U-value / material for a floor construction in Energy+ or eQuest</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">My method has always been to create a fictional material with negligible thickness that approximates the equivalent R-value for the whole floor area of the zone based on the edge requirement. This results in me creating a separate one
of these fictional materials for each zone. This is because even though a zone might have the same F-factor requirement the difference in perimeter to floor area ratio effects the actual heat flux through the floor, or so I think.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Here is an example of how I have modeled this, see attached picture for a layout:</p>
<p class="MsoNormal"><img width="411" height="483" id="Picture_x0020_1" src="cid:image001.png@01CC6249.A570F5C0"></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">F-Factor = 0.64 (equivalent to R-10 insulation for 48” and for an “Unheated Slab” per ASHRAE 90.1 Table A6.3)</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Zone 1</p>
<p class="MsoNormal">Area = 25 sqft</p>
<p class="MsoNormal">Edge Perimeter = 10 ft</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Zone 2</p>
<p class="MsoNormal">Area = 375 sqft</p>
<p class="MsoNormal">Edge Perimeter = 70 ft</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Perimeter * F factor = Area * U value equivalent</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Zone 1 equivalent U = 0.256</p>
<p class="MsoNormal">Zone 2 equivalent U = 0.119</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">This process has made sense to me, but in reviewing this technique with a colleague we wondered what does everyone else do. Am I under/over predicting slab loss for certain zones with this method? Your comments and insight are always
appreciated.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thanks,</p>
<p class="MsoNormal">Josh</p>
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<p class="MsoNormal"><span style="font-size:12.0pt; font-family:Papyrus; color:#003366">Joshua W. Talbert
</span><span style="font-size:10.0pt; font-family:"Times New Roman","serif"; color:#003366">P.E., LEED-AP</span><span style="font-size:12.0pt; font-family:Papyrus; color:#003366"></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt; font-family:Papyrus; color:#003366">Mechanical Engineer</span></p>
<p class="MsoNormal"><span style="font-size:16.0pt; font-family:"Arial","sans-serif"; color:#003366">Hallam</span><b><span style="font-size:16.0pt; font-family:"Arial Black","sans-serif"; color:#CC3300; position:relative; top:-1.0pt">///</span></b><span style="font-size:16.0pt; font-family:"Arial","sans-serif"; color:#003366">ICS</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:#003366">38 Eastwood Dr. Suite 200</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:#003366">S. Burlington, VT 05403</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:#003366">P: (802) 658-4891</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:#003366">F: (802) 658-1457</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:#003366"> </span></p>
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