[Equest-users] Enthalpy wheels

[Cam Fitzgerald]

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

 

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

"The only thing you take with you when you're gone is what you leave
behind." - John Allston

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