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<p class="MsoNormal"><span style="color:#1F497D">Hi Jim! Two separate thoughts:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo3"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">My position is that for Appendix G
<u>baselines</u>, mandatory provisions (#.4) are a given, as spelled out in the first Appendix G passages. Prescriptive requirements (#.5) do not apply except where specifically called out, such as with the envelope tables for determining baseline constructions.
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo3"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">It seems to me a clearer Appendix G mandate that the baseline’s thermostat/humidity setpoints must match the proposed design.<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">Without cracking open my copy to find citations, my strong hunch is that any reviewer who does note “excessive reheat quantities” could be refuted on both above points, emphasizing (and finding citations for)
the second.<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">A related/potentially helpful thought outside the framework of Appendix G: I think there are exceptions permitting dehumidification reheat in 90.1... I roughly recall this coming up once and finding it a non-issue
through some exception/passage…<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">~Nick<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><img width="119" height="37" id="_x0000_i1026" src="cid:image001.jpg@01CD21FB.7E4BD7E0" alt="cid:489575314@22072009-0ABB"></span><b><span style="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"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E">NICK CATON, P.E.</span></b><b><span style="font-size:12.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:7.5pt;color:#CC9900">SENIOR ENGINEER<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;color:#CC9900"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;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;color:#2D4D5E">25501 west valley parkway, suite 200<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">olathe, ks 66061<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">direct 913.344.0036<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#2D4D5E">fax 913.345.0617<o:p></o:p></span></p>
<p class="MsoNormal"><span style="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;color:blue">
</span></u><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><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>Jim Dirkes<br>
<b>Sent:</b> Tuesday, April 24, 2012 9:10 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org; EnergyPlus_Support@yahoogroups.com<br>
<b>Subject:</b> [Bldg-sim] ASHRAE 90.1-2007 modeling for a Baseline system with humidity control<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Dear Forums,<o:p></o:p></p>
<p class="MsoNormal">A recent discussion with a colleague has made me question my understanding of the proper way to model an HVAC system when humidity control is a project criteria. Imagine a building in South Florida that requires the
<u>space humidity not to exceed 55% RH</u>. <o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>The building might use Baseline system #4 (heat pump with electric supplemental heating). I have modeled that in the past simply as a normal heat pump with sub-cool + electric reheat for humidity control.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Another possibility is a System #5 or #6 (VAV fan with VAV or PFP boxes and reheat).
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt">The question is this:<o:p></o:p></span></b></p>
<p class="MsoNormal">90.1 has restrictions on the amount of air that may be reheated (It’s the greater of 0.4 cfm / sq.ft. or 30% of the peak airflow rate plus a few other items). These are noted in
<u>Section 6.5</u>.<o:p></o:p></p>
<p class="MsoNormal">Appendix G, however, does not reference the requirements of Section 6.5 anywhere (that I can see).
<b><span style="color:red">Do they apply to a Baseline energy model?</span></b><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks for your input!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><img border="0" width="336" height="192" id="Picture_x0020_1" src="cid:image002.jpg@01CD21FB.7E4BD7E0" alt="Description: BPT BizCard JVDII Updated"><o:p></o:p></p>
<p class="MsoNormal" style="margin-top:6.0pt"><b><i><span style="font-size:10.0pt">Making me think….<o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="margin-top:6.0pt"><span style="font-size:10.0pt">Seek truth while you are young, for if you do not, it will later escape your grasp</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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