[Bldg-sim] Reducing Fan Power for ERVs

Morgan Heater morgan at ecotope.com
Fri Apr 18 09:25:54 PDT 2014

We have moved away from selecting ERVs with fans because we can't find any
that we're satisfied with.  We generally spec the BPE heat exchangers
because the pressure drop is extremely low for the high heat recovery
performance.  For fans we usually use the Greenheck SQ-VG series (or the
loren cook equivalent) with ECM motors or the TMI/ZA series.  Both of them
are very efficient, but the TMI/ZA fans are a bit better.   I think you'll
probably want to go with the TMI/ZA fans with that much static.  


Morgan Heater


Ecotope, Inc

4056 9th Ave NE

Seattle, WA 98105

morgan at ecotope.com

office: 206-322-3753 ext 209

direct: 206-596-4709 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Porter, Fred
Sent: Friday, April 18, 2014 9:17 AM
To: bldg-sim at lists. onebuilding. org (bldg-sim at lists.onebuilding.org)
Subject: [Bldg-sim] Reducing Fan Power for ERVs


I'm trying to reduce the annual energy use of some DOAS/ERV fans which
will run at constant volume 24/7 365 days per year.


Right now we have 3.5" TSP on the supply/OA and 2.25" TSP on the exhaust.
I'm looking at some of the obvious measures to reduce the design static. 


Right now the fan efficiencies in this unit are in the mid to low 50%s.
The fans are part of the ERV and are just described as "forward curved;" I
didn't think a squirrel cage fan could handle that static but whatever
they have is rated for it.   


So, would any of the designers on this list have specific suggestions for
ERVs with fans that would be more efficient at these conditions?




Fred Porter, BEMP, LEEDC AP

Senior Energy Analyst

Architectural Energy Corporation

A Member of NORESCO Energy and Sustainability Services

2540 Frontier Ave, Suite 100, Boulder, CO  80301

Phone 303.459.7425 |  fporter at archenergy.com





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