The document summarizes a seminar about a hollow flashlight device that harvests energy from human body heat using the Peltier effect. The flashlight contains Peltier tiles mounted on a hollow aluminum tube, with one side heated by a person's hand holding the tube. This creates a temperature differential that the Peltier tiles convert into electricity using thermoelectric effect. This harvested energy from body heat is enough to power an LED light for over 20 minutes. The flashlight provides an advantage over batteries by providing clean, renewable energy from waste heat without using chemicals. Researchers are exploring ways to power small devices like hearing aids using excess body heat.

1. A SEMINAR BYVAIBHAW MISHRA(
1
A

2. Introduction
Idea behind
Principle
Peltier effect
Initial design
Model
Working
Better working
Advantages
conclusion
2

3. Introduction:
Human body and Heat.
Waste of energy .
Idea .
HOLLOW FLASHLIGHT is a device that
harvests energy from the human hand to power
itself.
3

4. 4

5. 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.
5

6. 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.
66

7. Peltier Tile:
7

8. 8

9. 9

10. 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.
10

11. 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).
9

12. 12

13. 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 :
13

14. 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 :
14

15. 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:
15

16. 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.
16

17. Makosinski, Ann. Fire or Ice - Electricity for an
Emergency,VIRSF, 2010.
Makosinski, Ann.The Piezoelectric Flashlight
- A NovelWay to Generate Green
Electricity, VIRSF, 2012.
David Salerno. UltralowVoltage Energy
Harvester UsesThermoelectricGenerator for
Battery FreeWireless Sensors; Journal of
Analog Innovation, October 2010.
17

18. 18

19. 19