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<title>DCV per ASHRAE 62.1 in eQuest</title>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Dan,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>eQuest cannot properly model ASHRAE 62.1 outdoor air rates, as
it takes the maximum OA value from OA-FLOW/PER or OA-FLOW/AREA, not the combined
sum as required by ASHRAE 62.1. However there is a very tedious workaround
to this. Using your occupancy schedule, you need to calculate the total
OA requirement (area and person) for each hour, and enter that into your zone OA
schedule as a fraction of the design flow of the RTU (OA cfm / RTU cfm). Basically,
you need to replace all the -999 values to a desired hourly fraction value. Unoccupied
hours should be set to zero. You need to repeat this for every OA schedule in each
hvac zone that has DCV. Do not use the ‘DCV zone sensors’
option, as it is useless in this case. Use the default (should be ‘Fraction
of Design Flow’). It gets messy if you have more than one occupancy
schedule.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Regards,<o:p></o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:#1F497D;text-transform:uppercase;letter-spacing:.2pt'>VICTOR YEUNG, </span></b><i><span
style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#1F497D;
letter-spacing:.2pt'>BASc, LEED® AP<o:p></o:p></span></i></p>
<p class=MsoNormal><i><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:#1F497D;letter-spacing:.2pt'>EIT - LEED®/Sustainable Development</span></i><b><span
style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D;
text-transform:uppercase;letter-spacing:.2pt'><o:p></o:p></span></b></p>
<p class=MsoNormal><i><span style='font-size:8.0pt;font-family:"Cambria","serif";
color:#262626;letter-spacing:.2pt'><a href="mailto:victor@invirosystems.ca"><span
style='font-family:"Times New Roman","serif"'>victor@invirosystems.ca</span></a><o:p></o:p></span></i></p>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> Bishop, Bill
[mailto:wbishop@pathfinder-ea.com] <br>
<b>Sent:</b> May 28, 2010 1:43 PM<br>
<b>To:</b> Dan Coutin<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] [Bldg-sim] DCV per ASHRAE 62.1 in eQuest<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Dan,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>[I copied the equest-users instead of bldg-sim.]<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>You need to enter zone-level OA as OA-FLOW/PER and/or OA-FLOW/AREA.
The OA flow/per (person) is what will vary the OA on an hourly basis, based on
your occupancy schedule(s). (Hourly OA = (# of people) * OA-FLOW/PER * (%
occupancy in schedule)). In order to turn OA off during unoccupied hours, I
create a MIN-AIR-SCH, coinciding with the fan schedule, set to zero when fan is
off (or night cycling) and -999 when fan is on. The hourly OA can be verified
by creating a new hourly report for the system to track total system supply air
flow rate and ratio of outside air to total supply air.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Regards,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'>Bill<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:navy'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Franklin Gothic Medium Cond","sans-serif";color:black'>William Bishop, EIT,
BEMP, LEED<sup>®</sup> AP </span></b><b><span lang=EN-US style='font-size:
10.0pt;font-family:"Franklin Gothic Medium Cond","sans-serif";color:#006600'>|</span></b><b><span
lang=EN-US style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond","sans-serif";
color:black'> </span></b><b><span lang=EN-US style='font-size:10.0pt;
font-family:"Franklin Gothic Medium Cond","sans-serif";color:black'>Pathfinder
Engineers & Architects LLP</span></b><b><span lang=EN-US style='font-size:
10.0pt;font-family:"Franklin Gothic Medium Cond","sans-serif";color:black'><o:p></o:p></span></b></p>
<p class=MsoNormal><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:black'>Mechanical Engineer<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:5.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:navy'>134 South Fitzhugh Street</span><span lang=EN-US style='font-size:
9.0pt;color:navy'><br>
</span><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:navy'>Rochester, NY 14608</span><span lang=EN-US style='font-size:9.0pt;
color:navy'><br>
</span><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:navy'>T: (585) 325-6004 </span><span lang=EN-US style='font-size:9.0pt;
font-family:"Arial","sans-serif";color:black'>Ext. 114</span><span lang=EN-US
style='font-size:9.0pt;color:navy'><br>
</span><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:navy'>F: (585) 325-6005</span><span lang=EN-US style='font-size:9.0pt;
font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:black'>wbishop@pathfinder-ea..com<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:9.0pt;font-family:"Arial","sans-serif";
color:black'>www.pathfinder-ea.com</span><span lang=EN-US style='color:navy'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:18.0pt;font-family:Webdings;
color:green'>P</span><span lang=EN-US style='color:green'> </span><span
lang=EN-US style='font-size:7.5pt;color:green'>May is National Bike Month. Bike
to Work Day May 21<sup>st</sup>.</span><span lang=EN-US style='color:green'><o:p></o:p></span></p>
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<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Dan Coutin<br>
<b>Sent:</b> Friday, May 28, 2010 12:02 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] DCV per ASHRAE 62.1 in eQuest</span><span
lang=EN-US><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Using
eQuest 3.63, I am modeling a school building with a high ventilation
requirement. The schedule indicates a minimum OA cfm and employs DCV that<u>
adds</u> OA per occupant in a manner similar to ASHRAE 62.1:2004.</span><span
lang=EN-US><o:p></o:p></span></p>
<p><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Can
someone informed, please suggest</span><span lang=EN-US> <o:p></o:p></span></p>
<p><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>a)
how this may be best input in eQuest, and:</span><span lang=EN-US> <br>
</span><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>b)
importantly, how it may be verified in the output. </span><span lang=EN-US><o:p></o:p></span></p>
<p><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>As
in real life the amount of ventilation (used/modeled) has a considerable energy
impact and needs to be particularly accurate.</span><span lang=EN-US><o:p></o:p></span></p>
<p><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I
see the DCV Zone sensors options, and have read the zone/system ventilation
help, but I find the help descriptions somewhat ambiguous.</span><span
lang=EN-US><o:p></o:p></span></p>
<p><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>In
this example the system is constant volume roof top units with heat recovery.
Unoccupied control is cycling fans with no ventilation.</span><span lang=EN-US><o:p></o:p></span></p>
<p><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks</span><span
lang=EN-US> <br>
</span><b><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Dan
Coutin,</span></b><span lang=EN-US> </span><span lang=EN-US style='font-size:
10.0pt;font-family:"Arial","sans-serif"'>Erdman Anthony, Albany, NY.</span><span
lang=EN-US> <br>
coutind@erdmananthony.com <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
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