Wind power without blades

Posted on 24 Mar 2017

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The piezoelectric effect turns physical motion into electricity. It doesn’t generate much, (apparently about 0.2 watts per unit,) but if you scaled it to cover the entire side of a large building, you could generate useful power. 

To power a single home most would be self-sufficient (plus some to sell back) with 6 kW generator. 

How big a structure would you need for that amount of power with this technology if you had a sufficiently windy space? Here are some numbers:

… This project proposes to put panels of about 250 four-inch oscillators per square meter on the sides of buildings. The arrays employ piezoelectric cantilevers to directly power applications or charge batteries. It has been estimated that the arrays can output up to 54 W/m^2, a number that is comparable to the 60-100 W/m^2 output of commercial solar panels.
What makes Vibro-wind unique from other renewable energy sources is that it allows energy harvesting in wind speeds as low as 2 m/s, whereas large-scale wind turbines require at least 9 m/s, and it works in locations with little sun.

Link

If we assume 50 Watts per square meter as an estimate, you’d need a 120 square meter wall of these. 50 watts x 120 is 6,000 watts which is 6kW. That’s 394 square feet. 

Something the size of a single billboard would more than do it. Cool!

A Bulletin is the largest standard-sized billboard that delivers maximum exposure to vehicular traffic on expressways, highways and primary arteries. Typically 14 feet high and 48 feet wide, a bulletin provides 672 square feet of space for your ad. Bulletins offer unparalleled visibility.

Link

Ah. These big boards are the Cadillac of bulletin boards, running $50,000 to $100,000. It wouldn’t make sense to spend money on one.

… monopoles come in everything from center-mount to full-flag, and back-to-back to tri-face. They can be over 100’ high if needed. They are chock full of catwalks and ladders, and lights are the norm.

These types of billboards can run from $50,000 to $100,000+

It does give you a good idea of how much space you would need, however. 

… a piezoelectric transducer, which is a device made of a ceramic or polymer that emits electrons when stressed.

Link

Where does one buy 30,000 piezoelectric transducer cantilevers that output 200 milliwatts each? 

I’m curious about the cost and specs.

Posted in: Alt Energy