[Equest-users] heat recovery and zone exhaust

Vipul Babriya vipulbabriya at aol.com
Thu Sep 12 13:35:47 PDT 2013

Hello Bill/James,

I have a typical situation for DOAS system that serves fresh air (100% OA) to corridor spaces in multifamily building. The DOAS unit is equiped with heat recovery wheel, and uses the exhaust air from apartments, i.e. exhaust from bathroom and kitchen rather than return air from corridor itself. How would i model the system that uses recovered heat from one system to another in the eQUEST.

Thanks in advance for your help.





-----Original Message-----
From: Bishop, Bill <wbishop at pathfinder-ea.com>
To: James Hansen <JHANSEN at ghtltd.com>; equest-users <equest-users at lists.onebuilding.org>
Sent: Wed, Dec 15, 2010 10:04 am
Subject: Re: [Equest-users] heat recovery and zone exhaust

Make sure to NOT enter zonal exhaust flowsif your intention is for the air to return to the ERV. Specifying zonal exhaustsimulates air leaving the zone through a separate exhaust fan (think bathrooms,kitchens, clothes dryers) and not returning to the air handling unit.

William Bishop, PE, BEMP, LEED®AP | PathfinderEngineers & Architects LLP
Mechanical Engineer

134 South Fitzhugh Street                 Rochester, NY 14608
T: (585) 325-6004 Ext. 114                F: (585) 325-6005
wbishop at pathfinder-ea.com           www.pathfinder-ea.com
P   Sustainability– the forest AND the trees. P 

From: equest-users-bounces at lists.onebuilding.org[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of James Hansen
Sent: Wednesday, December 15, 20109:59 AM
To:equest-users at lists.onebuilding.org
Subject: [Equest-users] heatrecovery and zone exhaust

I’mhaving the typical issues with getting an enthalpy wheel to show appreciablesavings.  I’ve adjusted some of the control sequences, and havemanaged to show a savings in cooling energy, but I’m getting no heatingsavings, which is strange, unless my building is actually asking for cold OAduring the winter because of the rather large internal heat loads (my guess isthat this is true).
Myquestion is whether you HAVE to define zonal exhaust airflow rates to properlyshow the savings from heat recovery, or if the program knows that the exhaustwill roughly match the OA delivered to the space?  Do I have to turn onexhaust tracking?
James Hansen, PE, LEED AP
1010 N. Glebe Rd, Suite 200
Arlington, VA  22201-4749
703-338-5754 (Cell)
703-243-1200 (Office)
703-276-1376 (Fax)

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