<div dir="ltr">Sorry to get off topic here but... Bill, is there a resource you can link to that shows a list of commands that can be used in user expressions and what they do?<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Aug 25, 2016 at 9:03 AM, Bishop, Bill via Equest-users <span dir="ltr"><<a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Darryl,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">There is no zone keyword for minimum ACH. But you can enter the zone design ACH (ZONE:AIR-CHANGES/HR) and set the minimum air changes as a percentage of this
using ZONE:MIN-FLOW-RATIO. You can write a keyword expression that enters and calculates this based on other zone inputs if you wanted to. For example, the expression below modifies the default DOE-2 expression for MIN-FLOW-RATIO, adding a calculation step
based on the zone input for AIR-CHANGES/HR. The sample calculation assumes you want a minimum ACH of 3, and calculates the MIN-FLOW-RATIO for any zones for which you enter a design ACH rate of 3 or more.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">if (#P("MIN-CFM-RATIO") == unused)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> then unused<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> else switch #SV(#P("TYPE"))<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> case 2 : unused<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> case 17 : unused<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> case 19 : unused<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> case 26 : unused<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> case 27 : unused<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> case 28 : unused<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> case 29 : unused<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> default : if (#RV(#P("MIN-CFM-RATIO")) == 0)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> then #P("MIN-CFM-RATIO")<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> else
<span style="background:yellow">if (#RV(#L("AIR-CHANGES/HR")) == 0<u></u><u></u></span></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d;background:yellow"> .AND. #L("AIR-CHANGES/HR") >= 3) then<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d;background:yellow"> 3/#L("AIR-CHANGES/HR") else no_default endif</span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> endif<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> endswitch<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"> endif<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">~Bill<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></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
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></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:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@<wbr>lists.onebuilding.org</a>]
<b>On Behalf Of </b>Darryl Kasun via Equest-users<br>
<b>Sent:</b> Wednesday, August 24, 2016 5:59 PM<br>
<b>To:</b> equest <<a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.<wbr>onebuilding.org</a>><br>
<b>Subject:</b> [Equest-users] Min Allowable Supply Air Flow<u></u><u></u></span></p><span class="">
<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Hello again eQUESTers,<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">For some zones, I want to set the min. allowable zone air supply flow rate to a certain ACH. There is a zonal input for min. design air changes/hr but I think eQUEST will go below this flow if possible. Sure I can calculate the minimum
flow as cfm.ft2 or ratio but would like to not do this work if possible! <u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">Is there a straight-up min. allowable ACH input for eQUEST?<u></u><u></u></p>
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