[Equest-users] FW: Enthalpy wheels

[Keith Swartz]

Tom,
Another effect, although less significant than the economizer, is that the additional pressure drop through the enthalpy wheel and its associated filters raises the fan power. This additional heat from the fan and motor is more load on the cooling system.

_____________________
Keith Swartz, P.E., LEED AP
Energy Engineer / Senior Project Manager
Energy Center of Wisconsin
455 Science Drive, Suite 200
Madison, WI 53711
Phone: 608.238.8276 x123
Fax: 608.238.0523
Email: kswartz at ecw.org<mailto:kswartz at ecw.org>
Web: www.ecw.org<http://www.ecw.org>

Energy Center University
Your gateway to sustainable design training and online education programs.
www.ecw.org/university/<http://www.ecw.org/university/>
________________________________
From: Cam Fitzgerald [mailto:cam at energyopportunities.com]
Sent: Wednesday, August 12, 2009 7:22 AM
To: 'Tom Lawrence'; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Enthalpy wheels

Tom:
If you have economizer controls for your unit, you need to disable the wheel during the temperate months to reap the benefits of the economizer or your cooling load WILL go up.
Cam S. Fitzgerald, PE, LEED AP

Energy Opportunities, LLC
a 7group company
phone:  (717) 292-2636 x11
fax:  (717) 292-0585
e-mail:  fitzgerald at sevengroup.com<mailto:fitzgerald at sevengroup.com>

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Tom Lawrence
Sent: Tuesday, August 11, 2009 2:57 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Enthalpy wheels

We are trying to model a building with enthalpy wheel OA energy recovery.
After completing the entire model and getting all set up in detailed edit mode, when we add in an enthalpy wheel for even just one zone, the cooling energy increases.  Heating energy does decrease.
We tried to:
1. Control sequence of operation for OA exhaust delta enthalpy (also same result if control when fans on and control by differential T)
2. As a test, it made no difference if it was enthalpy wheel, sensible wheel, enthalpy HX, sensible HX or heat pipe... same story with cooling increased.
3. Even with fan pressure rise set to '0' (no fan energy), cooling increased.

We have tried a multitude of combinations and keep getting similar results.



Tom Lawrence, Ph.D., P.E., LEED-AP
Public Service Associate, Faculty of Engineering
Driftmier Engineering Center
University of Georgia
Athens, GA 30602
(706) 542-4322
lawrence at engr.uga.edu<mailto:lawrence at engr.uga.edu>
"The only thing you take with you when you're gone is what you leave behind." - John Allston
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