Harvesting Energy from Human Body

Energy
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Harvesting Energy from Human Body

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  1. Harvesting Energy from the Human Body to Power Wearable Electronic, Medical &  Fitness Devices

    Slide 1 - Harvesting Energy from the Human Body to Power Wearable Electronic, Medical & Fitness Devices

  2. Purpose

    Slide 2 - Purpose

    • Can energy be harvested naturally from the human body to power wearable electronic devices without requiring the person to do any extra work?
  3. Research Focus 1:Electricity from Body Heat

    Slide 3 - Research Focus 1:Electricity from Body Heat

    • Human characteristic
    • Being warm blooded, the human body maintains a constant body temperature of 98.6ºF through homeostasis even though the ambient temperature varies significantly
    • Phenomenon
    • Seebeck Effect is a thermoelectric phenomenon in which temperature differences between two dissimilar conductors in a circuit produces a voltage difference between the two substances
    • Apply Seebeck effect to generate power from the difference in temperature between human body and the environment
  4. Thermoelectric Power Bracelet Prototype

    Slide 4 - Thermoelectric Power Bracelet Prototype

  5. Thermoelectric Generators Connected in Series: Temperature Gradient vs Output Voltage Graph

    Slide 5 - Thermoelectric Generators Connected in Series: Temperature Gradient vs Output Voltage Graph

    • With 4 modules connected in series 5.03 volts was generated with 33°C Δ𝑇, similar to inner/outer temp difference for a winter jacket
  6. Problems Encountered

    Slide 6 - Problems Encountered

    • Power generated varies significantly as it is directly proportional to the difference in temperature across the two surfaces of the thermoelectric module
    • Works great outdoors where ambient temperature is low during winters but indoors lower power is generated
    • Need a complimentary power generation capability when thermoelectric generation is not effective
    • Also need to store the power spurts, stabilize and release a steady stream to ensure electronics are not destroyed
  7. Research Focus 2:Electricity from Natural Body Motion

    Slide 7 - Research Focus 2:Electricity from Natural Body Motion

    • Human characteristic
    • There are several regular and rhythmic motions that occur such as breathing, heartbeat, or joint movement
    • Can power be generated each time we breath?
    • Phenomenon
    • Piezoelectric effect is the ability of certain materials to generate power when subjected to mechanical stress or vibration
    • Apply Piezoelectric effect to generate power from the rhythmic motion of body parts throughout the day
  8. Combine Thermoelectric and Piezoelectric Modules to Harvest Energy

    Slide 8 - Combine Thermoelectric and Piezoelectric Modules to Harvest Energy

    • Connect the Thermoelectric and Piezoelectric modules in parallel
    • Harness and stabilize the generated power spikes, with a Energy Harvester and releases it in a steady flow to external devices
  9. Future Plans

    Slide 9 - Future Plans

    • Power generating jackets can be developed by combining Seebeck and Piezoelectric effects
    • Power belts can be developed with Piezoelectric wafers that stretch during breathing
    • Power gloves can be developed with embedded Piezoelectric wafers to generate energy with finger motion
  10. Thank You!

    Slide 10 - Thank You!