IDeX - Energy - Piezoelectric Walls Convert Wind to Energy

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Nov042009

Piezoelectric Walls Convert Wind to Energy

Wednesday, November 4, 2009 at 10:30AM

As opposed to wind turbines, there is a need to investigate harvesting the wind as it flows around our buildings. Here we see a new consideration to the exterior elements in terms of our building materials and tectonics- and most importantly, energy production. Being on site, especially on the southern acres and on the crest of the hills, one can tell that the wind can become quiet strong. The idea that the exterior walls could capture the wind through piezoelectrics is plausible, yet the amount of energy that it could generate is still minimal. Using the idea of vortex shedding, when the wind hits the walls, it will drive the “leaves” to bend downstream in the air wake allowing us to collect the AC signal from the flapping piezo-leaf. The flapping motion is attributed to instability of the aero-elastic system, and considering the unpredictable wind strength and diverse outdoor ambient, that is why they would ideally be made out of a flexible piezoelectric material like Polyvinylidene Fluoride (PVDF). Once the AC signal is collected from the leaf, which is working on a periodic bending model, the electrical energy is stored in a capacitor after rectifying it with a full-wave bridge. Based around a modular brick system, the concept implies that each brick would have an allotted amount of “leaves” with a flexible piezo generator at their stem, which would then route the harvested energy to the connected network. Right now the energy generated may be enough to power a light-bulb or two, but over time the power could also be stored in a battery for later use.

Here are some cool sites regarding research on piezoelectrics that show the potential for this energy source in the future:

http://ccsl.mae.cornell.edu/node/116 (research on the “leaf” idea by the Cornell Computational Synthesis Laboratory)

http://peswiki.com/energy/Directory:Piezoelectric (resources related to energy generation and harvesting using piezoelectric effects)

http://www.treehugger.com/files/2008/03/grow-solar-piezo-electric-concept.php#ch02 (solar/ piezoelectric concept developed by SMIT for an Industrial Design Thesis; appeared at the MoMA’s “Design and Elastic Mind” exhibition in NY in May 2009)

Mackenzie King

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