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<TITLE>Re: OA-CFM/PER?</TITLE>
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<FONT FACE="Arial"><SPAN STYLE='font-size:12pt'>Joe — thanks for the pointer. I didn’t even think to look in the INP file. There it is: multiple examples of OA-FLOW/PER but none of OA-CFM/PER. I’d say that’s pretty good evidence that the reference to OA-CFM/PER in the documentation is an error.<BR>
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On Joe’s question: “If you input outside air as "OUTSIDE-AIR-FLOW" for each zone, does this override DCV's ability to ratchet down the outside air rate based on occupancy schedule?” I’m not sure if this will come into play in my model, but you should be able to figure it out by creating a report that gives you that variable for the entire year, then do some analysis with Excel. I’ve had luck with that in the past.<BR>
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“Should OA be input as people and "OA-FLOW/PER", when trying to accurately model DCV?” I believe so. You would provide the CFM per person required by ASHRAE 62 (probably have to derate it for the heating season). I’m going to try that now and see how it goes.<BR>
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</SPAN></FONT><FONT COLOR="#1E487C"><FONT SIZE="2"><FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='font-size:10pt'>Steve Samenski, PE, LEED AP, BEMP<BR>
Vice President - Sustainable Technologies<BR>
The Spinnaker Group, Inc.<BR>
<a href="http://equest-diary.livejournal.com/">http://equest-diary.livejournal.com/</a><BR>
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On 10/5/10 9:42 AM, "Joe Fleming" <<a href="joe.fleming@tlc-eng.com">joe.fleming@tlc-eng.com</a>> wrote:<BR>
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</SPAN></FONT><BLOCKQUOTE><FONT COLOR="#1F497D"><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>We had just noticed that typo over here this week as well. It is FLOW/PER in the .inp file.<BR>
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Another question on that topic. <BR>
If you input outside air as "OUTSIDE-AIR-FLOW" for each zone, does this override DCV's ability to ratchet down the outside air rate based on occupancy schedule? <BR>
Should OA be input as people and "OA-FLOW/PER", when trying to accurately model DCV?<BR>
<BR>
Sometimes when using DCV we don't see near the savings that we would expect for a South Florida climate. And we have yet to pinpoint the outside air loads on the systems in the detailed simulation output reports.<BR>
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</SPAN></FONT><FONT COLOR="#1F497D"><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'><B>Joe Fleming<BR>
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</SPAN></FONT><FONT SIZE="2"><FONT FACE="Tahoma, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:10pt'><B>From:</B> <a href="equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>] <B>On Behalf Of </B>STEVE SAMENSKI<BR>
<B>Sent:</B> Monday, October 04, 2010 7:55 PM<BR>
<B>To:</B> equest-users<BR>
<B>Subject:</B> [Equest-users] OA-CFM/PER?<BR>
</SPAN></FONT></FONT><FONT FACE="Times New Roman"><SPAN STYLE='font-size:12pt'> <BR>
</SPAN></FONT><SPAN STYLE='font-size:12pt'><FONT FACE="Arial">Here’s a question about Demand Controlled Ventilation in eQuest. I’m trying to justify a model I built that uses critical zone DCV. In the past I’ve simply trusted that eQuest calculates this properly but now I find myself having to provide backup rationale to the USGBC.<BR>
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In Volume 6 of the documentation it states: “Each zone OA requirement is calculated based upon the hourly maximum of either OA-CFM/PER (times the NUMBER-OF-PEOPLE adjusted by the hourly PEOPLE-SCHEDULE) or a minimum OA ventilation rate.” However, “OA-CFM/PER” is never defined in any other dictionary, at least not in any manner that would tell you how to change or input this variable (it is referenced elsewhere). I think this is a typo. I think the sentence should refer to “OA-FLOW/PER”, which is a perfectly transparent and well-behaved user input (so far as I know).<BR>
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Anyone run across this before? Can anyone confirm that Volume 6 has a typo?<BR>
</FONT></SPAN><FONT SIZE="1"><FONT FACE="Verdana, Helvetica, Arial"><SPAN STYLE='font-size:9pt'><BR>
</SPAN></FONT></FONT><FONT FACE="Verdana, Helvetica, Arial"><FONT COLOR="#1F497D"><FONT SIZE="2"><SPAN STYLE='font-size:10pt'>Steve Samenski, PE, LEED AP, BEMP<BR>
Vice President - Sustainable Technologies<BR>
The Spinnaker Group, Inc.<BR>
<a href="http://equest-diary.livejournal.com/">http://equest-diary.livejournal.com/</a></SPAN></FONT></FONT></FONT></BLOCKQUOTE>
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