<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:p="urn:schemas-microsoft-com:office:powerpoint" xmlns:a="urn:schemas-microsoft-com:office:access" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns:b="urn:schemas-microsoft-com:office:publisher" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:odc="urn:schemas-microsoft-com:office:odc" xmlns:oa="urn:schemas-microsoft-com:office:activation" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:q="http://schemas.xmlsoap.org/soap/envelope/" xmlns:rtc="http://microsoft.com/officenet/conferencing" xmlns:D="DAV:" xmlns:Repl="http://schemas.microsoft.com/repl/" xmlns:mt="http://schemas.microsoft.com/sharepoint/soap/meetings/" xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ppda="http://www.passport.com/NameSpace.xsd" xmlns:ois="http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir="http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:dsp="http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc="http://schemas.microsoft.com/data/udc" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sub="http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec="http://www.w3.org/2001/04/xmlenc#" xmlns:sp="http://schemas.microsoft.com/sharepoint/" xmlns:sps="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:udcs="http://schemas.microsoft.com/data/udc/soap" xmlns:udcxf="http://schemas.microsoft.com/data/udc/xmlfile" xmlns:udcp2p="http://schemas.microsoft.com/data/udc/parttopart" xmlns:wf="http://schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:dsss="http://schemas.microsoft.com/office/2006/digsig-setup" xmlns:dssi="http://schemas.microsoft.com/office/2006/digsig" xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" xmlns:mver="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:mrels="http://schemas.openxmlformats.org/package/2006/relationships" xmlns:spwp="http://microsoft.com/sharepoint/webpartpages" xmlns:ex12t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ex12m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:pptsl="http://schemas.microsoft.com/sharepoint/soap/SlideLibrary/" xmlns:spsl="http://microsoft.com/webservices/SharePointPortalServer/PublishedLinksService" xmlns:Z="urn:schemas-microsoft-com:" xmlns:st="" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>All,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have again run into that issue where an interior corridor has hundreds of unmet load hours for no apparent reason. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I noticed the “Max Flow ratio” value on the “Air Flow” tab at the zone level.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The “Max Flow ratio” is defined as “the ratio of the maximum heating airflow to the cooling airflow”.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The way I interpret this is:<o:p></o:p></p><p class=MsoNormal>-if a space has a maximum cooling air flow of 100 CFM, then the maximum supply of heating airflow is 50 CFM. Not sure if ventilation air flow is included in this or not. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Given that corridors could easily be a heating dominated zone given the few internal gains, it is entirely possible that the heating flow rate would need to be greater than the cooling flow rate. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I set the “Max Flow ratio” to 1.0 and eliminated nearly all of the unmet load hours in the corridor. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Here is a sample of the hourly airflow data before and after:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>“Max Flow ratio” = 0.5 (default)<o:p></o:p></p><p class=MsoNormal>Air flow (cfm) Unmet load (btu/hr)<o:p></o:p></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=139 style='width:104.2pt;margin-left:-.7pt;border-collapse:collapse'><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>71.0369<o:p></o:p></span></p></td><td width=75 nowrap valign=bottom style='width:56.2pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>71.0369<o:p></o:p></span></p></td><td width=75 nowrap valign=bottom style='width:56.2pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>71.0369<o:p></o:p></span></p></td><td width=75 nowrap valign=bottom style='width:56.2pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>91.6157<o:p></o:p></span></p></td><td width=75 nowrap valign=bottom style='width:56.2pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>-3248.37<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>91.6157<o:p></o:p></span></p></td><td width=75 nowrap valign=bottom style='width:56.2pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>-1852.04<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>91.6157<o:p></o:p></span></p></td><td width=75 nowrap valign=bottom style='width:56.2pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>-62.291<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>91.6157<o:p></o:p></span></p></td><td width=75 nowrap valign=bottom style='width:56.2pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>91.6157<o:p></o:p></span></p></td><td width=75 nowrap valign=bottom style='width:56.2pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>91.6157<o:p></o:p></span></p></td><td width=75 nowrap valign=bottom style='width:56.2pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>91.6157<o:p></o:p></span></p></td><td width=75 nowrap valign=bottom style='width:56.2pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>73.7393<o:p></o:p></span></p></td><td width=75 nowrap valign=bottom style='width:56.2pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>71.0369<o:p></o:p></span></p></td><td width=75 nowrap valign=bottom style='width:56.2pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>71.0369<o:p></o:p></span></p></td><td width=75 nowrap valign=bottom style='width:56.2pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr></table><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Max airflow rate for the year is 114.158 cfm. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>“Max Flow ratio” = 1.0<o:p></o:p></p><p class=MsoNormal>Air flow (cfm) Unmet load (btu/hr)<o:p></o:p></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=147 style='width:110.0pt;margin-left:-.7pt;border-collapse:collapse'><tr style='height:15.0pt'><td width=83 nowrap valign=bottom style='width:62.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>71.0369<o:p></o:p></span></p></td><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=83 nowrap valign=bottom style='width:62.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>71.0369<o:p></o:p></span></p></td><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=83 nowrap valign=bottom style='width:62.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>71.0369<o:p></o:p></span></p></td><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=83 nowrap valign=bottom style='width:62.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>183.231<o:p></o:p></span></p></td><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=83 nowrap valign=bottom style='width:62.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>183.231<o:p></o:p></span></p></td><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=83 nowrap valign=bottom style='width:62.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>162.112<o:p></o:p></span></p></td><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=83 nowrap valign=bottom style='width:62.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>148.446<o:p></o:p></span></p></td><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=83 nowrap valign=bottom style='width:62.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>137.97<o:p></o:p></span></p></td><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=83 nowrap valign=bottom style='width:62.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>133.187<o:p></o:p></span></p></td><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=83 nowrap valign=bottom style='width:62.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>130.599<o:p></o:p></span></p></td><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=83 nowrap valign=bottom style='width:62.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>91.221<o:p></o:p></span></p></td><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=83 nowrap valign=bottom style='width:62.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>71.0369<o:p></o:p></span></p></td><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=83 nowrap valign=bottom style='width:62.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:black'>71.0369<o:p></o:p></span></p></td><td width=64 nowrap valign=bottom style='width:48.0pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>0<o:p></o:p></span></p></td></tr></table><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Max airflow rate for the year is 183.231 cfm. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The only other airflow related variable input in the zone is a 0.06 cfm/ft2 outside air flow requirement per ASHRAE 62.1. There are no system level inputs related to airflow. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Am I interpreting/using this “Max Flow ratio” value properly?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Fred<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><table class=MsoNormalTable border=0 cellpadding=0 width=474 style='width:355.5pt'><tr><td width=167 valign=top style='width:125.25pt;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;color:#660000;text-transform:uppercase'>Fred Betz</span></b><b><span style='font-size:9.0pt;color:#333333'> </span></b><span style='font-size:9.0pt;color:#333333'>PhD., LEED AP <br></span><span style='font-size:10.0pt;color:#333333;text-transform:uppercase'>Sustainable Systems Analyst</span><span style='font-size:9.0pt;color:#333333'><o:p></o:p></span></p></td><td width=10 valign=top style='width:7.5pt;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><span style='font-size:9.0pt;color:#333333'> <o:p></o:p></span></p></td><td width=283 valign=top style='width:212.25pt;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:9.0pt;color:#660000'>AEI</span></b><span style='font-size:9.0pt;color:#333333'> | AFFILIATED ENGINEERS, INC. <br>5802 Research Park Blvd. | Madison, WI 53719<br><br></span><span style='font-size:9.0pt;color:#660000'>P: 608.236.1175 | F: 608.238.2614</span><span style='font-size:9.0pt;color:#333333'> <br></span><span style='font-size:9.0pt;color:#660000'><a href="mailto:fbetz@aeieng.com"><span style='color:#660000;text-decoration:none'>fbetz@aeieng.com</span></a> | </span><b><span style='font-size:9.0pt;color:#660000'><a href="http://www.aeieng.com/"><span style='color:#660000;text-decoration:none'>www.aeieng.com</span></a></span></b><span style='font-size:9.0pt;color:#333333'> <o:p></o:p></span></p></td></tr></table><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>