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Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data
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Wind Energy Conversion by Plant-Inspired Designs.

Michael A McCloskey1,2, Curtis L Mosher1, Eric R Henderson1,2

  • 1Department of GDCB, Iowa State University, Ames, IA, United States of America.

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Summary
This summary is machine-generated.

Artificial piezoelectric leaves inspired by nature show limited energy harvesting potential. Current designs, even scaled up, do not generate significant power for a carbon-neutral economy.

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Area of Science:

  • Renewable Energy
  • Biomimicry
  • Materials Science

Background:

  • Traditional wind turbines face challenges like noise, aesthetics, wildlife impact, and deployment limitations.
  • Artificial plants with piezoelectric elements are proposed as an alternative for wind energy harvesting.
  • Piezoelectric materials convert mechanical stress into electrical energy.

Purpose of the Study:

  • To measure the energy conversion efficiency of cottonwood-inspired piezoelectric leaves.
  • To compare the performance of these mimics against a vertical flapping stalk design.
  • To assess the potential of piezoelectric botanic mimics for contributing to a carbon-neutral energy economy.

Main Methods:

  • Emulation of cottonwood leaves for their periodic flutter properties to optimize piezoelectric excitation.
  • Measurement of energy conversion in cottonwood-mimicking piezoelectric leaves and a vertical flapping stalk.
  • Testing of a cattail-inspired leaf with stacked piezoelectric elements wired in parallel to investigate capacitance effects.

Main Results:

  • Cottonwood mimics outperformed the vertical flapping stalk in energy conversion over a 0°-90° azimuthal range.
  • Both designs produced significantly less than a watt (daW) per conceptualized tree, far below the estimated 80W dissipated by a real cottonwood tree's leaf motion.
  • Power output increased with capacitance, but extrapolations to acre-sized arrays still predicted very low power generation (<< daW).

Conclusions:

  • Current piezoelectric materials and botanic mimic designs are insufficient for harvesting significant mid-range power from conveniently sized artificial plants.
  • Limitations in charge generation, scaling with capacitance, hinder the viability of this approach.
  • Emerging technologies like electrostriction and triboelectric systems may offer more promising avenues for future research in this area.