<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:10pt">Brad:<br><br>Did you intended to post a message?<br><br>G3.1.2.4 is unclear. First it states that the supply fan shall run continuously during the occupied hours and shall be cycled to meet heating and cooling loads during unoccupied hours. Ok , I get that.<br><br>Then it states that if the supply fan is modeled as cycling and the fan energy is included in the EER, then the fan energy shall not be modeled explicitly. That is confusing. When is it permissible to model the supply fan as cycling. Is AHSRAE talking a supply fan serving a space that is never occupied? Obviously, there is no such thing, someone will sometime do something in the room.<br><br>Then G3.1.2.4 goes on to state that the supply, return or exhaust fans will remain on during occupied and
unoccupied hours in spaces that have heath and safety mandated minimum ventilation requirements during unoccupied hours.<br><br>This requirement does not cover many of the scenarios that I model. For example, natural ventilation provided by operable windows. It does not make sense to keep the fan running if it not supplying ventilation air. I am presently modeling a residential high-rise. No one keeps their apartment supply fan running 24X7. Especially if there are operable windows.<br><br>Another example is a commercial property that has a DOAS supplying minimum air directly to the zone HVAC system or supplying minimum directly to the zone without isolation dampers. If I supply the 62.1 minimum air required by the DOAS, then why run the supply fan?<br><br>I would be interested to hear other interpretations. Perhaps Jason Glazer can give us his unofficial opinion.<br><br>Paul Diglio<br><div><br></div><div
style="font-family: times new roman,new york,times,serif; font-size: 10pt;"><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> Brad L. Huff <BradH@BVHis.com><br><b><span style="font-weight: bold;">To:</span></b> "equest-users@lists.onebuilding.org" <equest-users@lists.onebuilding.org><br><b><span style="font-weight: bold;">Sent:</span></b> Fri, June 10, 2011 10:10:50 AM<br><b><span style="font-weight: bold;">Subject:</span></b> [Equest-users] 2007 90.1 Appendix G3.1.2.4<br></font><br>
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--></style><div class="WordSection1"><p class="MsoNormal">Modelers,</p><p class="MsoNormal"> </p><p class="MsoNormal" style=""><b><span style="font-size: 8.5pt; font-family: "sans-serif"; color: gray;">Brad Huff, E.I.T., LEED Green Associate, Mechanical Engineer</span></b><span style="font-size: 8pt; font-family: "sans-serif"; color: navy;"> </span><b><span style="font-size: 8.5pt; font-family: "sans-serif"; color: rgb(0, 0, 160);">I BVH Integrated Services I</span></b><b><span style="font-size: 8.5pt; font-family: "sans-serif"; color: black;"> </span></b><b><span style="font-size: 8.5pt; font-family: "sans-serif"; color: gray;">860.286.9171 tel </span></b><b><span style="font-size: 8.5pt; font-family: "sans-serif"; color: rgb(0, 0, 160);">I</span></b><b><span style="font-size: 8.5pt; font-family: "sans-serif"; color: gray;"> 860.242.0236 fax</span></b><b><span
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