We did a paper on this back in 2000 that folks may find interesting. A
bit outdated- two 10W (thin film) fans were used for a 1000 sf home.
http://www.fsec.ucf.edu/en/publications/html/FSEC-GP-171-00/index.htm
Conclusion:
"Comparing periods with similar weather conditions, the test revealed
that the PV vent fans have the potential to reduce measured peak summer
attic air temperatures by over 20oF. However, the impact over the
cooling season is fairly modest with well insulated attics. Measured
space cooling reduction was approximately 6% - worth about 460 kWh
annually at the test home." [test home had R-19 ceiling insulation]
On 2012/6/8 12:09, Carl Adams wrote:
Fellow Wrenches,
I have had several prospects and customers ask about installation of
solar attic fans. One customer had a roof replacement prior to our PV
install and the roofing contractor installed a solar attic fan. I
could not make out any name brand on the unit, but it was quite noisy
for a brand new device. Makes me wonder about it's longevity. Have
any of you a good quality brand you would recommend for those
customers who are interested?
With Regards
Carl Adams, SunRock Solar
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