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<p class="MsoNormal"><span lang="EN-US">Good morning everyone,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We are having an issue with the calculated total fan flow of the baseline case and was wondering if someone could help me out. We are modeling a 12 floor hotel, with a VRF system in the first three floors and PTAC’s
in the remaining 9 (rooms); for a total conditioned area of about 92325 sf. The baseline case is modeled with a system 2 per ASHRAE appendix G. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The following table summarizes our issue:<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">Baseline case<o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span lang="EN-US">Proposed case<o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span lang="EN-US">Total cooling capacity<o:p></o:p></span></b></p>
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<td width="174" valign="top" style="width:130.5pt;border-top:none;border-left:none;border-bottom:solid windowtext 1.0pt;border-right:solid windowtext 1.0pt;padding:0in 5.4pt 0in 5.4pt">
<p class="MsoNormal"><span lang="EN-US">281.5 tons<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">247 tons<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">Design airflow rate<o:p></o:p></span></b></p>
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<p class="MsoNormal"><span lang="EN-US">39700 cfm<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">80500 cfm<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We used the automatic calculation from eQuest (leaving both capacity and fan flow blank) for the baseline case, and the actual mechanical design for the proposed case. For some reason, the baseline calculation for the
fan flow seems to be very low, and was wondering if anyone has had a similar issue regarding the automatic calculations from eQuest. If so, has anyone found a solution?
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">If we analyze other estimates, eQuest is calculating about 0.43 cfm/sf for the baseline, which also seems very low compared to other projects we have worked with. We are also thinking of using the following formula to
estimate the baseline fan flow: Sensible btu=1.09*cfm*dT; but with this approach we get a fan flow about 50% more that the proposed, which also seems unlikely. Any suggestions for estimating the baseline fan flow which LEED reviewers accept?
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks you very much, hope someone can help us out. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="line-height:150%"><b><span lang="EN-US" style="font-size:10.0pt;line-height:150%;font-family:"Verdana","sans-serif";mso-fareast-language:ES"> Ing. Gastón Michaud F.
<o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif""> Tel.: (506) 2222-7529<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif""> Fax: (506) 2256-5608<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif""> From USA: 1-305-433-3668</span><span lang="EN-US" style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana","sans-serif"">
</span><span lang="EN-US" style="font-size:7.5pt;font-family:"Verdana","sans-serif"">Calle 30, Avenid</span><span style="font-size:7.5pt;font-family:"Verdana","sans-serif"">a 0 y 2. San José, Costa Rica<o:p></o:p></span></p>
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