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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi Tejas,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">I believe that eQUEST/DOE-2 always gives priority to outside air flow, so that hourly outdoor air requirements are always satisfied, consistent with the zone
and/or system OA cfm values and control method. Therefore, the “minimum outdoor air flow rate” requirement in ASHRAE 90.1-G3.1.3.13 is automatically met.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">So you enter 0.30 for the SYSTEM:MIN-FLOW-RATIO and you meet the 30% minimum flow requirement. (You can also enter minimum flow at the zones using ZONE:MIN-FLOW-RATIO,
but the default expression copies the system-level value if it is entered.)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">HOWEVER, if you still wanted an expression that sets the MIN-FLOW-RATIO to the greater of 30% or SYSTEM:MIN-OUTSIDE-AIR, you could use this expression for SYSTEM:MIN-FLOW-RATIO:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">if (#RV(#L("MIN-OUTSIDE-AIR")) == 0)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> then MAX(#L("MIN-OUTSIDE-AIR"),0.30)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> else 0.30<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> endif<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">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">~Bill<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"><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:black">William Bishop, PE, BEMP, BEAP, CEM, LEED AP
</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:#006600">|</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium",sans-serif;color:black"> Pathfinder Engineers & Architects LLP<o:p></o:p></span></b></p>
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<p class="MsoNormal" style="line-height:105%"><b><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black">Senior Energy Engineer<o:p></o:p></span></b></p>
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<p class="MsoNormal" style="line-height:105%"><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black">
</span><img width="110" height="110" id="Picture_x0020_4" src="cid:image007.jpg@01D3A641.5728E7E0" alt="https://upload.wikimedia.org/wikipedia/en/thumb/9/96/The_Prodigy_Spitfire.jpg/220px-The_Prodigy_Spitfire.jpg"><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:105%"><span style="font-size:5.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="line-height:105%"><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#1F497D">134 South Fitzhugh Street</span><span style="font-size:9.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D">
</span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#1F497D">Rochester, NY 14608<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:105%"><b><i><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#002060">T: (585) 698-1956</span></i></b><b><i><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#002060">
</span></i></b><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D"> </span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:#1F497D">F: (585) 325-6005</span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:105%"><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D"><a href="mailto:wbishop@pathfinder-ea.com"><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:blue">bbishop@pathfinder-ea.com</span></a></span><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black">
</span><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D"><a href="http://www.pathfinder-ea.com/"><span style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:blue">www.pathfinder-ea.com</span></a><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-top:3.0pt;line-height:105%"><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D"><img border="0" width="34" height="32" id="Picture_x0020_5" src="cid:image008.png@01D3A641.5728E7E0" alt="http://png-5.findicons.com/files/icons/977/rrze/720/globe.png"></span><span style="font-size:7.5pt;line-height:105%;font-family:"Calibri",sans-serif;color:#00B0F0">Carbon
Fee and Dividend - simple, effective, and market-based.</span><span style="font-size:11.0pt;line-height:105%;font-family:"Calibri",sans-serif;color:#1F497D"><o:p></o:p></span></p>
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<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"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Equest-users [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>equest user via Equest-users<br>
<b>Sent:</b> Thursday, February 15, 2018 7:17 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] USER EXPRESSION<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi all Modelers,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">This question is for all those 'user expressions' prodigies.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Can anyone guide me on how can user expression be used for MIN-FLOW RATIO in Air side sytem as ASHRAE states to keep MIN-FLOW RATIO as 0.30 or equal to Design outdoor air value whichever is greater.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I am in need of a user expression which i should be able to put in MIN- FLOW RATIO Keyword such that it <o:p></o:p></p>
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<p class="MsoNormal"><b>1) takes the Value as '0.30'</b> <i>when outdoor design ratio is less than 0.30 and </i><o:p></o:p></p>
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<p class="MsoNormal"><b>2) takes the Value same as design outdoor ratio</b><i> when design ratio value is greater than 0.30</i><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><i>Thanks and regards,</i><o:p></o:p></p>
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<p class="MsoNormal"><i>Tejas</i><o:p></o:p></p>
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