[Equest-users] FW: Heat recovery issues

[Keith Swartz]

Rebecca,

The additional pressure drop through the heat exchanger and its filters has an electrical energy penalty that can sometimes (actually, quite often) cancel out cooling energy savings. I suggest checking these pressure drops to make sure they are realistic. I would also see if the air could be allowed to bypass the heat exchanger when not needed, such as for economizer operation, to reduce the number of hours that the extra pressure drop is experienced.

_____________________

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
Web: www.ecw.org

Energy Center University
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-----Original Message-----
From: Grove, Rebecca [mailto:RGrove at ThorntonTomasetti.com]
Sent: Wednesday, May 13, 2009 10:19 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Heat recovery issues

 I seem to be running into a slight problem getting the heat recovery
system to work. Right now I have it set as a sensible wheel with an
airflow of 35315 cfm and an efficiency of 60% (all according to the
specifications given to me). Unfortunately, using the heat exchanger
actually causes my energy consumption to increase. Do you have any idea
why this might be happening and what I can do to fix it?


Rebecca Grove, LEED AP
Senior Engineer
Thornton Tomasetti
One Audubon Street, Fourth Floor
New Haven, CT  06511
T 203.672.1390  F 203.672.1391
D 203.672.1436
RGrove at ThorntonTomasetti.com
www.ThorntonTomasetti.com

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