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?
Thanks,
Fred
Fred Porter, BEMP, LEED(c) 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
www.archenergy.com
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
PE, BEMP, LEED AP
Ecotope, Inc
4056 9th Ave NE
Seattle, WA 98105
morgan at ecotope.com
office: 206-322-3753 ext 209
direct: 206-596-4709