|MadSci Network: Engineering|
Hi Jim Yes, if you would be happy with a few microwatts! Most attic fans are driven BY USING electricity. To get power from them you need to drive them FASTER than the mains does. Or you can switch them off and let the rising hot air turn the fans. That would generate a few milliwatts. A typical motor is around 50% efficient so the maximum power you could in fact extract from an electrically-powered fan (by placing a similar fan to be blown round by its air) would be 25% of the power used by the electrically-powered fan. So you would be losing energy, not gaining it (and the house would get hotter!) John
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