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<p class="MsoNormal"><a name="_MailEndCompose"><span style="color:#1F497D">Bikesh,<o:p></o:p></span></a></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I would refer you to the following document:<o:p></o:p></span></p>
<p class="MsoNormal"><a href="https://energydesignresources.com/media/2651/EDR_DesignGuidelines_VAV.pdf?tracked=true">https://energydesignresources.com/media/2651/EDR_DesignGuidelines_VAV.pdf?tracked=true</a><span style="color:#1F497D"><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">Happy hunting!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:#1F497D"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><!--MAKE-SURE-TO-SET-THE-TD-WIDTH--><td width="80" style="padding-right: 13px;" valign="top"><a href="http://www.archnexus.com"><img src="http://www.stationerycentral.com/SignatureImages10/ArchNexus-logo-80x99.png" nosend="1" border="0" width="80" height="99" alt='ARCH | NEXUS'></a></td><td width="1" valign="top" style="border-left: 1px #009AD9 solid;"> </td><td style="padding-left: 9px;"><table border="0" cellspacing="0" cellpadding="0" width="100%"><tr><td align="left" colspan="2"><span style="color: #52616E; font-family: 'Verdana', sans-serif; font-size: 11pt; font-weight: normal">DAVID W. GRIFFIN II</span></td></tr><tr><td style="padding-top: 6px;" align="left" colspan="2"><span style="color: #52616E; font-family: 'Verdana', sans-serif; font-size: 7.5pt;">BEMP</span><span style="color: #52616E; font-family: 'Verdana', sans-serif; font-size: 7.5pt;"><br>ENERGY ANALYST</span></td></tr><tr><td align="left" style="padding-top: 6px; padding-bottom: 6px;" colspan="2"><span style="color: #52616E; font-family: 'Verdana', sans-serif; font-size: 7.5pt;"> 2505 E Parleys Way<br>Salt Lake City, UT 84109 </span></td></tr><tr><td align="left" width="100%" style="padding-left: 3px; white-space: nowrap;"><span style="color: #52616E; font-family: 'Verdana', sans-serif; font-size: 7.5pt;"><b>Office</b> 801.924.5028 </span></td></tr><span style="color: #52616E; font-family: 'Verdana', sans-serif; font-size: 7.5pt;"></span><tr><td align="left" style="padding-top: 6px; padding-bottom: 0px; white-space: nowrap;" colspan="2"><span style="color: #52616E; font-size: 7.5pt; font-weight: normal; font-family: 'Verdana', sans-serif;"><a style="text-decoration: none; color: #52616E" href="http://www.archnexus.com"><font color="#52616E">archnexus.com</font></a></span></td></tr><tr><td align="left" style="padding-top: 6px; padding-bottom: 0px; white-space: nowrap;" colspan="2"><a href="https://twitter.com/arch_nexus"><img src="http://www.stationerycentral.com/SignatureImages10/ArchNexus-tw-sharp-L-29x22.png" nosend="1" border="0" width="29" height="22" alt="Twitter"></a><a href="https://www.facebook.com/pages/Architectural-Nexus/179588705397563?ref=ts&fref=ts"><img src="http://www.stationerycentral.com/SignatureImages10/ArchNexus-fb-sharp-L-29x22.png" nosend="1" border="0" width="29" height="22" alt="Facebook"></a><a href="https://www.youtube.com/channel/UCYRPWKF-yp-AUiI8ia2XfKw?feature=mhee"><img src="http://www.stationerycentral.com/SignatureImages10/ArchNexus-yt-sharp-L-29x22.png" nosend="1" border="0" width="29" height="22" alt="Youtube"></a><a href="https://www.linkedin.com/company/architectural-nexus"><img src="http://www.stationerycentral.com/SignatureImages10/ArchNexus-li-sharp-L-29x22.png" nosend="1" border="0" width="29" height="22" alt="LinkedIn"></a></td></tr></table></td></tr></table><style> a {color: #009AD9;} </style></span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="color:windowtext">From:</span></b><span style="color:windowtext"> Bikesh Dahal [mailto:bdahal@EMEGroup.com]
<br>
<b>Sent:</b> Wednesday, November 30, 2016 10:16 AM<br>
<b>To:</b> David Griffin II; Joe Huang; Nicholas Caton; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> RE: How does eQuest designates total supply CFM for VAV units?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:windowtext">Hi All,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">I was wondering if anyone could provide some insight on to VAV systems in eQuest.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">My modeling process:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">Set min cfm/sqft=0.4 (As per guidelines)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">Supply air to room air temperature difference of 20<sup>0</sup>F<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">However, it seems as if supply cfm capacity mentioned in report (SV-A) is always high. However, maximum fan load in SS-H never seems to reach the peak (based on my kw/cfm input) .<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">This makes me think that eQuest is oversizing the supply cfm quite a bit. Could someone provide some guideline on this issue. Am I missing something?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext">Bikesh<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:windowtext"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="color:windowtext">From:</span></b><span style="color:windowtext"> Equest-users [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>David Griffin II via Equest-users<br>
<b>Sent:</b> Tuesday, November 29, 2016 6:04 PM<br>
<b>To:</b> Joe Huang <<a href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a>>; Nicholas Caton <<a href="mailto:Nicholas.Caton@schneider-electric.com">Nicholas.Caton@schneider-electric.com</a>>;
<a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Purpose of a DESIGN-DAY CLIMATE input?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Nick/Joe,<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">I have done some light research on the topic since DOE2.3 moves in the direction of utilizing DESIGN-DAY more rigorously; e.g. if you depend on the weather file for auto sizing in DOE2.3, your simulation takes
twice as long. I would refer both of you to page 23 of the DOE2.3 Volume 6 “Design-Sizing Enhancements” where it appears the eQUEST team is attempting exactly what Joe previously mentioned.<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">Although I believe the CLIMATE input is still available in DOE2.3 it may be ignored by the new algorithm. Maybe Jeff H. can shed some light on this situation for us.<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">Sincerely,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:windowtext"><a href="http://www.archnexus.com"><span style="border:solid windowtext 1.0pt;padding:0in;text-decoration:none"><img border="0" width="80" height="99" id="_x0000_i1025" src="cid:image001.jpg@01D24AF3.763C3010" alt="Image removed by sender. ARCH | NEXUS"></span></a><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif;color:#52616E">DAVID W. GRIFFIN II</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:windowtext"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#52616E">BEMP<br>
ENERGY ANALYST</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:windowtext"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#52616E">2505 E Parleys Way<br>
Salt Lake City, UT 84109 </span><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:windowtext"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#52616E">Office</span></b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#52616E"> 801.924.5028
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<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#52616E"><a href="http://www.archnexus.com"><span style="color:#52616E;text-decoration:none">archnexus.com</span></a></span><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:windowtext"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;color:windowtext"><a href="https://twitter.com/arch_nexus"><span style="border:solid windowtext 1.0pt;padding:0in;text-decoration:none"><img border="0" width="29" height="22" id="_x0000_i1026" src="cid:image002.jpg@01D24AF3.763C3010" alt="Image removed by sender. Twitter"></span></a><a href="https://www.facebook.com/pages/Architectural-Nexus/179588705397563?ref=ts&fref=ts"><span style="border:solid windowtext 1.0pt;padding:0in;text-decoration:none"><img border="0" width="29" height="22" id="_x0000_i1027" src="cid:image002.jpg@01D24AF3.763C3010" alt="Image removed by sender. Facebook"></span></a><a href="https://www.youtube.com/channel/UCYRPWKF-yp-AUiI8ia2XfKw?feature=mhee"><span style="border:solid windowtext 1.0pt;padding:0in;text-decoration:none"><img border="0" width="29" height="22" id="_x0000_i1028" src="cid:image002.jpg@01D24AF3.763C3010" alt="Image removed by sender. Youtube"></span></a><a href="https://www.linkedin.com/company/architectural-nexus"><span style="border:solid windowtext 1.0pt;padding:0in;text-decoration:none"><img border="0" width="29" height="22" id="_x0000_i1029" src="cid:image002.jpg@01D24AF3.763C3010" alt="Image removed by sender. LinkedIn"></span></a><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="color:windowtext">From:</span></b><span style="color:windowtext"> Joe Huang via Equest-users [<a href="mailto:equest-users@lists.onebuilding.org">mailto:equest-users@lists.onebuilding.org</a>]
<br>
<b>Sent:</b> Tuesday, November 29, 2016 1:49 PM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Equest-users] Purpose of a DESIGN-DAY CLIMATE input?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p>I think this is a case of DOE-2 still using an older procedure for the solar portion of the design day calculation. Prior to 2006, ASHRAE used a relatively crude ASHRAE Clear Sky Model to determine the hourly profile of solar radiation for the design day.
That model assumes there are different sky conditions for different latitudes, etc. In 2006, ASHRAE TC 4.2 (Climatic Information) carried out a project to develop an entirely new ASHRAE Clear Sky Model that's a parameterization of a detailed solar model developed
by Chris Gueymard. <o:p></o:p></p>
<p>It would be nice if DOE-2 incorporates the new ASHRAE Clear Sky Model, which isn't terribly hard, but would take work. Besides, I'm under the impression that the vast majority of DOE-2 users don't do design day calculations but rather let the program autosize
the equipment anyway!<o:p></o:p></p>
<p>Joe<o:p></o:p></p>
<pre>Joe Huang<o:p></o:p></pre>
<pre>White Box Technologies, Inc.<o:p></o:p></pre>
<pre>346 Rheem Blvd., Suite 205A<o:p></o:p></pre>
<pre>Moraga CA 94556<o:p></o:p></pre>
<pre><a href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a><o:p></o:p></pre>
<pre><a href="http://weather.whiteboxtechnologies.com">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data<o:p></o:p></pre>
<pre>(o) (925)388-0265<o:p></o:p></pre>
<pre>(c) (510)928-2683<o:p></o:p></pre>
<pre>"building energy simulations at your fingertips"<o:p></o:p></pre>
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<p class="MsoNormal">On 11/29/2016 9:43 AM, Nicholas Caton via Equest-users wrote:<o:p></o:p></p>
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<p class="MsoNormal">I have a question concerning doe2/eQUEST DESIGN-DAYs.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">One of the keywords for DESIGN-DAY confuses me: CLIMATE. I have not been able to find this documented in the current doe2 reference manual or 2.1A engineering manuals.
<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">It appears the CLIMATE keyword can accept one of three inputs: “SUBARCTIC,” “MIDLATITUDE,” or “TROPICAL.” The default is MIDLATITUDE and does not appear to reference anything else.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><img border="0" width="567" height="463" id="_x0000_i1030" src="cid:image003.png@01D24AF3.763C3010"><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">So I have a few questions:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>What is this input used for? Does it help to determine solar angles during design day calculations? Does it affect how other DESIGN-DAY inputs are interpreted?<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Since one of the options is named “MIDLATITUDE,” my best guess is this is trying to establish in a loose sense which slice of the globe the weather station is located at for solar angle purposes. From that guess,
<a href="http://www.lat34north.com/cities/CitiesLatitude.cfm">I googled the topic for a bit</a> and came up with this framework:<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>SUBARCTIC latitudes are > 66.5 or < -66.5 (Inside the Arctic circles – experiences days of complete daylight/darkness)<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">b.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>TROPICAL is between -23.5 and 23.5 (Tropic of Capricorn/Cancer – experiences the sun traversing directly overhead)<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">c.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>MIDLATITUDE = everywhere else<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>I struggle however with the concept of a DESIGN-DAY input based on latitude, where<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">a.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>The latitude is already a part of the weather file required for every simulation… and pulling the exact latitude would be more accurate anyway (I confess here I have never studied solar pathing in great depth – the problem may be simpler
than I realize?).<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">b.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>These bands alone don’t give you enough information to know when you’re in the lower hemisphere (where solar angles based on the day/month would be flipped)<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">c.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>This leads me to question whether there’s a (meaningful) difference in solar angles experienced for loads calculations when you use the weather file instead of DESIGN-DAY inputs.
<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level2 lfo2">
<![if !supportLists]><span style="mso-list:Ignore">d.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Alternatively, maybe the latitude IS pulled from the weather file for solar angle purposes so I’m completely on the wrong path as to the purpose/intent for the CLIMATE input.<o:p></o:p></p>
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<p class="MsoNormal">Can anyone set me straight on this topic?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">~Nick<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#3A7A46">Nick Caton, P.E., BEMP</span></b><o:p></o:p></p>
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