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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">An extension of Robert¡¯s advice: Check your first floor¡¯s inputs for increased infiltration loads the second floor does not have. This behavior may be normal,
considering doors/vestibules/windows.<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">I don¡¯t think I¡¯m totally following your exhaust strategy, but another general caution per your word choice: You may not want to have a ¡°roof¡± on your first
floor. If you ultimately do have a roof (exterior) surface sandwiched between your floors (easy mistake if you defined each floor as a separate shell), you have possibly nearly doubled your roof loads for the building. Much further discussion on this and
how to handled inter-floor heat transfer in the archives, but planes sandwiched between shells should generally be either interior surfaces of some sort (air/framed/adiabatic), or deleted.<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">~Nick<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"><img width="119" height="37" id="Picture_x0020_1" src="cid:image001.jpg@01CCF562.AC342380" alt="cid:489575314@22072009-0ABB"></span><b><span style="font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E"><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:"Stylus BT","sans-serif";color:#2D4D5E">NICK CATON, P.E.</span></b><b><span style="font-family:"Stylus BT","sans-serif";color:#2D4D5E"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900">SENIOR ENGINEER<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Calibri","sans-serif";color:#CC9900"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">Smith & Boucher Engineers</span><span style="font-size:7.5pt;font-family:"Times New Roman","serif";color:#CC9900"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">25501 west valley parkway, suite 200<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">olathe, ks 66061<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">direct 913.344.0036<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#2D4D5E">fax 913.345.0617<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span style="font-size:10.0pt">www.smithboucher.com</span></a></span><u><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:blue">
</span></u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><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>??<br>
<b>Sent:</b> Sunday, February 26, 2012 11:36 PM<br>
<b>To:</b> RobertWichert<br>
<b>Cc:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] why the autosized design air flow rate differ so much in different floor?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">I think I have known one of the reasons( if more than one).<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">I set a self-defined wall in the Wizard data edit mode, using the R value definition. However, the R value automatically became U value
under Detailed data edit mode. So the roof heat conduction is very large. Besides, I set a ceiling in the second floor which exhaust the hot air out, so the roof conduction load in the second floor is zero. These settings caused the first floor load much larger
than the second floor.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">At 2012-02-27 01:32:12,RobertWichert <<a href="mailto:robert@wichert.org">robert@wichert.org</a>> wrote:<br>
<br>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">Five to ten times? Check your occupancy carefully. It sounds like outside air to me. You either have no occupants on the second floor or ten times the occupants
on the first floor.<br>
<br>
<br>
<br>
<o:p></o:p></span></p>
<pre><span style="color:black">Robert Wichert P.Eng. LEED AP<o:p></o:p></span></pre>
<pre><span style="color:black">+1 916 966 9060<o:p></o:p></span></pre>
<pre><span style="color:black">FAX +1 916 966 9068<o:p></o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">===============================================<o:p></o:p></span></pre>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><br>
On 2/26/2012 4:42 AM, James Hansen wrote: <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">It's almost surely your first floor slab. The default configuration and U-value for these constructions are usually very poor.<br>
<br>
-James<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><br>
On Feb 26, 2012, at 7:31 AM, "</span><span lang="ZH-CN" style="font-size:10.5pt;color:black">º«ÐÇ</span><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">" <<a href="mailto:foolishstar@163.com">foolishstar@163.com</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">Hi, every body,
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">I now have a difficult problem. I found that the autosized design air flow in the first floor is much larger than the second floor, about 5-10 times of the second
floor. I cannot figure out the reason, because the indoor lighting, equipment power and the occupant density are all the same for the two floors.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">In my opinion, the second floor should have a higher air-conditioning load than the first floor because it is the building's top floor. But the result is just the
opposite.<o:p></o:p></span></p>
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<div>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">I really want to know the reason and how I should deal with it.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">Thanks<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black">Xing<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:black"><o:p> </o:p></span></p>
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