<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">Just wanted to share an e-mail from Jeff. I did not know that an ERV on a OA-From system was not supported by eQuest. That explains why I could never get the correct airflows on this type of design.<br><br>Unfortunately almost every project I work on does specify a VAV DOAS with an ERV to supply ventilation air to some type of HVAC system, such as VRF indoor coils, chilled beams or PTHP units. I will have to try the work around Jeff suggested.<br><div> </div>Paul Diglio, CEM, CBCP<br><br><div>87 Fairmont Avenue<br>New Haven, CT 06513<br>203-415-0082</div><br><br><div><span><a target="_blank" href="http://www.pdigliollc.com">www.pdigliollc.com</a></span><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">----- Forwarded Message ----<br><b><span style="font-weight: bold;">From:</span></b> Jeff Hirsch <James.J.Hirsch@gmail.com><br><b><span style="font-weight: bold;">To:</span></b> Paul Diglio <paul.diglio@sbcglobal.net><br><b><span style="font-weight: bold;">Sent:</span></b> Mon, June 3, 2013 12:17:58 PM<br><b><span style="font-weight: bold;">Subject:</span></b> Re: [Equest-users] OA From System Question<br></font><br>
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<div style="MARGIN-RIGHT:0px;" dir="ltr">Setting your OA system (ERU1) to be vav
and having the ERV on it will not work correctly. If you need ERV you must
place your ERV in the IU system and use that system to supply the conditioned
OA. ERV on a OA-FROM system is not supported. VAV on an OA-FROM
system is possibly not what you want but I cannot tell what you are trying to
do. An IU system has a central constant volume air supply with each zone
then having zone coil to do the zone thermostat controlled conditioning via room
air flow induced as a constant ratio supply air fro the IU (the
induction-ratio). So it seems you can use the IU system as your ERU system
supplying the zones. If there is some other reason you used an OA-FROM system,
then perhaps my suggestions don’t apply, but the ERV and VAV comments always
apply.</div>
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<span style="FONT-FAMILY:calibri;FONT-WEIGHT:bold;"></span><span style="FONT-FAMILY:calibri;FONT-WEIGHT:bold;">Jeff Hirsch</span><br style="FONT-FAMILY:calibri;"><span style="FONT-FAMILY:calibri;">James J. Hirsch
& Associates</span><br style="FONT-FAMILY:calibri;"><span style="FONT-FAMILY:calibri;">12185 Presilla Road - </span><span style="FONT-FAMILY:calibri;">Camarillo, CA 93012-9243 USA<br></span><span style="FONT-FAMILY:calibri;">phone: (805) 553-9000 mobile: (805) 532-1045
</span><span style="FONT-FAMILY:calibri;">fax: (805) 532-2401</span><br style="FONT-FAMILY:calibri;"><span style="FONT-FAMILY:calibri;">email: </span><a rel="nofollow" style="FONT-FAMILY:calibri;">James.J.Hirsch@gmail.com</a><br style="FONT-FAMILY:calibri;"><span style="FONT-FAMILY:calibri;"></span><span style="FONT-FAMILY:calibri;"></span></div>
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<div style=""><b>From:</b> <a rel="nofollow" title="paul.diglio@sbcglobal.net" ymailto="mailto:paul.diglio@sbcglobal.net" target="_blank" href="mailto:paul.diglio@sbcglobal.net">Paul Diglio</a> </div>
<div><b>Sent:</b> Monday, June 03, 2013 6:11 AM</div>
<div><b>To:</b> <a rel="nofollow" title="equest-users@lists.onebuilding.org" ymailto="mailto:equest-users@lists.onebuilding.org" target="_blank" href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a>
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<div><b>Subject:</b> [Equest-users] OA From System Question</div></div></div>
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<div style="FONT-SIZE:10pt;FONT-FAMILY:times new roman, new york, times, serif;COLOR:#000000;">Morning:<br><br>I
am trying to model a chilled beam system as induction units. The primary
air is supplied by an ERU. I set the outside air to 0 on the chilled beams
HVAC systems tab.<br><br>In the chilled beam zone tab I set the outside air to
the primary CFM and the overall CFM to the induced air flow.<br><br>Per the
eQuest help menu, "The sum of the OA requirements for all SYSTEMs that reference
an OA-FROM-SYSTEM is used to set the referenced OA-FROM-SYSTEM value for
MIN-OUTSIDE-AIR, SUPPLY-FLOW as well as adjust the referenced OA-FROM-SYSTEM
directly served ZONE maximum and minimum flows for both heating and cooling."
<br><br>But per my hourly reports, the ERU is not supplying the necessary amount
of primary air and in the summer the ERU flow drops to .01 CFM.<br><br>Attached
are the project files. Any ideas?<br><br>Thank you,<br>
<div> </div>Paul Diglio, CEM, CBCP<br><br>
<div>87 Fairmont Avenue<br>New Haven, CT 06513<br>203-415-0082</div><br><br>
<div><span><a rel="nofollow" target="_blank" href="http://www.pdigliollc.com">www.pdigliollc.com</a></span>
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