Hollow flashlight (2)

A SEMINAR BY VAIBHAW MISHRA(

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A A PRESENTATION BYVAIBHAW MISHRA

What we will cover…..

IntroductionIdea behindPrinciplePeltier effectInitial design ModelWorking Better workingAdvantagesconclusion

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Introduction: Human body and Heat.

Waste of energy .

Idea .

HOLLOW FLASHLIGHT is a device that harvests energy from the human hand to power itself.

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Ann Makosinski

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Idea behind : Ann Makosinski - HOLLOW

FLASHLIGHT.

The basic principle - Peltier Effect

Peltier tiles convert heat into energy using the temperature differential between a person’s hand and the ambient air.

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Principle: Thermoelectric effect .

Thermoelectric device.

At the atomic scale, an applied temperature gradient causes charge carriers in the material to diffuse from the hot side to the cold side.

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Peltier Tile:

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Initial Design:

Peltier tiles were tested to see if they could produce sufficient power to light an LED.

The power was no problem but getting the needed voltage was.

The transformer was used to rise the voltage.

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Model: Peltier tiles were mounted on a hollow aluminum

tube .

A spot was cut on the PVC tube where the hand could warm the tiles.

The result was a flashlight that could shine for more than 20 minutes if the outside temperature was more than 5 degrees Celcius (about 34 degrees Fahrenheit).

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The tiles are fixed to the outside of a hollow tube.

One side of the tile is heated, while air flowing through the hollow tube helps keep the other side cool.

The electricity generated by the temperature differential powers the LED light.

Working :

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Flashlight work better when the difference between the ambient temperature and body temperature is greater.

So while the flashlights worked with an air temperature of 10°C (50° F), they emitted more light with the air temperature at 5°C (41° F).

It is capable to maintain a steady beam of light for 20 minutes, even in the warmer temperature.

Better Working :

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Only needs a five degree temperature difference to work.

Harvesting energy, like with this flashlight, can provide a lot of potential for powering small devices .

No use of chemical and toxic batteries.

Advantage of Hollow Flashlight:

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Conclusion:

The final prototype cost US$26, but the product could be produced in mass quantities for less.

Researchers look into ways to capture excess body heat as a means of powering devices like hearing aids and pacemaker.

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References

Makosinski, Ann. Fire or Ice - Electricity for an Emergency, VIRSF, 2010.Makosinski, Ann. The Piezoelectric Flashlight - A Novel Way to Generate Green Electricity,  VIRSF, 2012. David Salerno. Ultralow Voltage Energy Harvester Uses Thermoelectric Generator for Battery    Free Wireless Sensors; Journal of Analog Innovation, October 2010.

Queries

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