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<p style="TEXT-ALIGN: left" class="MsoBodyText"><font face="courier new,monospace">Nick/Kendra,</font></p>
<p style="TEXT-ALIGN: left" class="MsoBodyText"><font face="Courier New">The altitude factor effects the supply air and the outside air. The write up below suggests that one calculate both supply and outside air at sea level and then apply the altitude factor to it. In real life, however, the design engineer is calculating and specifying supply and outside air cfm that is already adjusted for the altitude and the altitude factor should simply be set at 1.0 in eQUEST.</font></p>
<p style="TEXT-ALIGN: left" class="MsoBodyText"><font face="Courier New">The excerpts below discuss the areas of eQUEST impacted by the altitude factor:</font></p>
<p style="TEXT-ALIGN: left" class="MsoBodyText"><font face="Courier New">N</font>ote: the quantities in this report (SV-A) have been adjusted for <font style="BACKGROUND-COLOR: #316ac5" color="#ffffff">altitude</font> even though DOE-2 requires that any flows you enter in SYSTEMS be at sea level.</p>
<p class="MsoBodyText"></p></span><span style="FONT-FAMILY: 'Tms Rmn','serif'">1. </span>SUPPLY FLOW<br>is the calculated or user-specified supply flow for each zone. Only if you have specified a value for the ASSIGNED-FLOW keyword in the ZONE command will the value here correspond to your input. The ZONE keywords AIR-CHANGES/HR and FLOW/AREA will be accepted by SYSTEMS only if they are consistent with the user-supplied HEATING-CAPACITY and COOLING-CAPACITY and are equivalent to a flow larger than that of the exhaust from or the ventilation to the zone. The <font style="BACKGROUND-COLOR: #316ac5" color="#ffffff">ALTITUDE FACTOR</font> will be applied.</div>
<p style="MARGIN-LEFT: 36pt; tab-stops: 36.0pt" class="MsoListNumberCxSpMiddle"><span style="FONT-FAMILY: 'Tms Rmn','serif'">5. </span>OUTSIDE AIR FLOW<br>reflects the user-specified outside air quantity entered at the zone level. If OUTSIDE-AIR-FLOW is specified, its value is multiplied by the <font style="BACKGROUND-COLOR: #316ac5" color="#ffffff">ALTITUDE FACTOR</font> and reported here. Otherwise the reported value is the maximum of the flow-equivalent values of OA-CHANGES and OA-FLOW/PER, multiplied by <font style="BACKGROUND-COLOR: #316ac5" color="#ffffff">ALTITUDE FACTOR</font>. For the actual amount of outside air delivered to the zone for central systems, see OUTSIDE AIR RATIO above.</p>
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<div class="gmail_quote">On Thu, Jan 20, 2011 at 10:49 AM, Nick Caton <span dir="ltr"><<a href="mailto:ncaton@smithboucher.com">ncaton@smithboucher.com</a>></span> wrote:<br>
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<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt">Kenda,</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt">I’m curious as to whether you received any responses to the query below.</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"> </span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt">I have incorporated a practice of manually setting the site altitude in my eQuest models to “0,” because (1) as designers we do not specify equipment with CFM’s at sea level, it is already “corrected” for altitude in this sense, and (2) those who review models tend to miss the significance of the altitude factor in the SV-A reports and complain of incorrectly entered airflow rates.</span></p>
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<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt">I don’t know if this constitutes a “best practice,” but I know it is common to a number of the regular contributors to these lists besides myself. As it stands, current standards (90.1-2007) don’t have us “de-rate” or otherwise adjust required minimum SEER/EER values for altitude… so inversely it seem appropriate to remove the altitude variable when modeling for a performance rating… thoughts?</span></p>
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<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt">~Nick</span></p>
<p class="MsoNormal"><span style="COLOR: #1f497d; FONT-SIZE: 11pt"><img alt="cid:489575314@22072009-0ABB" src="https://mail.google.com/mail/html/compose/static_files/blank_quirks.html?ui=2&ik=367e06555b&view=att&th=12da4c2bcd697d9b&attid=0.0.1&disp=emb&zw" width="119" height="37"></span><b><span style="COLOR: #2d4d5e; FONT-SIZE: 11pt"></span></b></p>
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<p class="MsoNormal"><b><span style="COLOR: #2d4d5e; FONT-SIZE: 11pt">NICK CATON, E.I.T.</span></b><b><span style="COLOR: #2d4d5e"></span></b></p>
<p class="MsoNormal"><span style="COLOR: #cc9900; FONT-SIZE: 7.5pt">PROJECT ENGINEER</span></p>
<p class="MsoNormal"><span style="COLOR: #2d4d5e; FONT-SIZE: 10pt">Smith & Boucher Engineers</span><span style="COLOR: #cc9900; FONT-SIZE: 7.5pt"></span></p>
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<p class="MsoNormal"><b><span style="FONT-SIZE: 10pt">From:</span></b><span style="FONT-SIZE: 10pt"> <a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Kendra Tupper<br>
<b>Sent:</b> Thursday, September 02, 2010 1:53 PM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] Does eQUEST derate equipment for altitude?</span></p>
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<p class="MsoNormal">All,</p>
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<p class="MsoNormal">I'm trying to get clarification on exactly how eQUEST handles the altitude above sea level that is entered in Site Parameters. My understanding is this affects the airflow sizing calculations for cfm, but does not change the hourly air density for all calculations. If that is correct, then the altitude only corrects the cfms at the zone and system level, but does not derate equipment efficiencies. So, if you were to enter the altitude above sea level, you should then enter your airflows at sea level, but enter all equipment efficiencies at the derated conditions for that altitude.</p>
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<p class="MsoNormal">Is that correct?</p></div>
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<p class="MsoNormal">Kendra Tupper, PE, LEED AP<br>Senior Consultant<br>Built Environment Team<br><br>Rocky Mountain Institute | T 303-567-8641 | F 303-245-7213 | <a href="http://www.rmi.org/" target="_blank">www.rmi.org</a></p>
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Carol Gardner PE<br>