Battery-Replacement Scale Energy Harvesting From HVAC Flows

Create an energy scavenging device that produces over 100 µW of power in air flows of 2-5 m/s. These operating conditions are characteristic of HVAC systems, and the power output would be sufficient to run a low-power wireless sensor node at ~1% duty cycle.

Using a cylindrical obstacle inside an HVAC flow, a fin attached to a piezoelectric bender vibrates and harvests energy as a result of an oscillatory pressure differential caused by periodic vortex shedding off of the obstacle.

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