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<p class="MsoNormal">A value of 0.001 in the MIN-AIR-SCH activates an air-side economizer, allowing a unit to provide cooling by varying the volume of outside air.<o:p></o:p></p>
<p class="MsoNormal">In a dedicated outdoor air system (DOAS) or other air-side system with 100% outside air, hourly values of the MIN-AIR-SCH should be 1.0.<o:p></o:p></p>
<p class="MsoNormal">What about a <b>100% OA system with variable flow</b>?<o:p></o:p></p>
<p class="MsoNormal">I think the <b>hourly values in the MIN-AIR-SCH should still be set to 1.0 for all hours</b>. Hourly reports in my tests show the flowrate increasing above the MIN-FLOW-RATIO during cooling conditions, while the OA is still at 100%.<o:p></o:p></p>
<p class="MsoNormal">If I use 0.001 in the MIN-AIR-SCH, the hourly OA% drops way below 100%.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Does this seem right?<o:p></o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">~Bill<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Custom hourly reports can show the flowrate and OA% of air handlers. This is a typical BDL input for hourly reporting of total system supply air flow rate and OA ratio, in this case for a system “RVU-2”:<o:p></o:p></p>
<p class="MsoNormal">"RVU-2 Hourly Block" = REPORT-BLOCK <o:p></o:p></p>
<p class="MsoNormal"> VARIABLE-TYPE = "RVU-2"<o:p></o:p></p>
<p class="MsoNormal"> VARIABLE-LIST = ( 17, 39 )<o:p></o:p></p>
<p class="MsoNormal"> ..<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">"Hourly Report" = HOURLY-REPORT <o:p></o:p></p>
<p class="MsoNormal"> LIBRARY-ENTRY "Hourly Report"<o:p></o:p></p>
<p class="MsoNormal"> REPORT-BLOCK = ( "EM1 Hourly Report Block", "FM1 Hourly Report Block",
<o:p></o:p></p>
<p class="MsoNormal"> "RVU-2 Hourly Block" )<o:p></o:p></p>
<p class="MsoNormal"> ..<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></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:#1F497D">134 South Fitzhugh Street</span><span style="font-size:9.0pt;line-height:105%;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="color:#002060">
</span></i></b><span style="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%"><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 style="font-size:9.0pt;line-height:105%;font-family:"Arial",sans-serif;color:black">
</span><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><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-top:3.0pt;line-height:105%"><img border="0" width="34" height="32" id="Picture_x0020_5" src="cid:image009.png@01D31833.1865A670" alt="http://png-5.findicons.com/files/icons/977/rrze/720/globe.png"><span style="font-size:7.5pt;line-height:105%;color:#00B0F0">Carbon
Fee and Dividend - simple, effective, and market-based.</span><span style="color:#1F497D"><o:p></o:p></span></p>
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