human power in energy harvesting

1. ENERGY HARVESTING FOR ENGINEERS
ASSESSMENT
“PRESENTATION”
DEPARTMENT OF CHEMICAL ENGINNERING
SCHOOL OF TECHNOLOGY
PANDIT DEENDAYAL ENERGY UNIVERSITY
GANDHINAGAR
NAME :- MILAP ,SANDIP ,HINAL, FALGUNI
ROLL NUMBERS: 35,22,14,08
BRANCH: CHEMICHAL

3. OUTLINE
Rajat Chauhan- CHEM- 21MCH005- PDEU
MOTIVATION
INTRODUCTION
ENERGY HARVESTING FROM
HUMAN BODY
CONCLUSION

4.  Until several decades ago, energy consumption was not an issue, but but in recent
years, it has become more and more evident that energy resources are finite and
that there are limits to how much anthropic pressure the environment can
sustain. Thus it was found that repurposing human energy into some daily lives
activities had many benefits.
Motivation
Effects of anthropic actions on forest and urban areas
Anthropic pressure is an
indicator of the impact of
human activity on the
environment.

5.  Human metabolism is connected to the environment on a large scale, to sustainability, pollution, and
climate change.
 In fact, it is a well-established fact that “anthropic pressure” is the main determinant of environmental
pollution.
 The need to reduce carbon emissions worldwide is one of the biggest challenges science faces today.
 The “green transition” and related increased public awareness about environmental problems
motivated the search for alternative sources of energy.
 In ancient times, human beings have been studied as machines for energy production and
consumption and for their impact on the environment .
INTRODUCTION
Can we harvest energy
from human body??[2]

6.  The human body contains a great amount of energy. In fact, the average adult’s body fat deposits store as
much energy as a one-ton battery .
 It has been calculated that the monthly energy capacity of a person taking 7500 steps/day is equivalent to a
0.40 mAh battery rated at 1.2V.
 An average person could generate power comparable to a 1 m2 solar panel on a sunny day and 10 m2 of solar
panels on an overcast day.
 Our bodies are like giant energy factories, with oxygen, food, and water as primary fuel sources.Each human
cell is capable of producing approximately 1.4 volts of electricity. Although this may not sound like a lot,
when multiplied by the 50 trillion cells in our body, we arrive at an astonishing 70 trillion volts or the
equivalent of 70 billion lightning bolts.
THE HUMAN
BATTERY
• Robert Obrest, an athlete competing as a strongman,
eats 15,000 to 20,000 calories per day,
storing the capacity to produce a large amount of energy.

7. HARVESTING ENERGY
FROM HUMANS
 ENERGY HARVESTING FROM HUMAN MOTION
https://youtu.be/4j4w_36X0nU?si=G967bJVnisjTDXX0

8. HARVESTING ENERGY
FROM HUMAN BODY
WORKING
• Among the human body motions, lower limb motions, such as ankle, knee, and hip motions induce
high biomechanical energy because these joints generate a larger torque than other human joints. In
particular, during walking or gait motion, the abovementioned motions are periodically repeated,
indicating that energy can be harvested continuously.Therefore, many studies have focused on
harvesting biomechanical energy generated during motion.
• Electrical energy produced mainly by human biomechanical energy sources and three typical
principles of kinetic energy harvesting, piezoelectric (PE), & triboelectric (TB).

9. HARVESTING ENERGY
FROM HUMANS
]
 KINETIC ENERGY HARVESTING:
• Kinetic energy is extracted through motion, displacement, or enforcement excitation.
• The human body generates kinetic energy when it's in motion. For example, a runner builds
up kinetic energy in their feet and legs, which is usually converted to heat, which is further
used to generate electrical energy using thermal genrators.
• The human body can dissipate 60–180W, depending on the type of activity performed.
 PIEZO ELECTRIC EFFECT:
• Piezoelectric energy harvesting is a method of converting mechanical energy into electrical
power. It uses the property of materials to generate an electric field when a mechanical force is
applied.

10. HARVESTING ENERGY
FROM HUMANS
 Triboelectric Energy Harvesting:
• Triboelectric energy harvesting is the process of converting mechanical energy into electrical
energy. It uses the triboelectric effect, which is the process of charging two uncharged bodies when
they are brought into contact and then separated.
Triboelectric energy harvesting works by:
• Friction or temporary contact between two different triboelectric materials.
• Generating triboelectric charges on the surfaces between the two dielectrics
• Causing a potential difference between the two electrodes
• Generating AC power
includes materials like polymers,
metals, and inorganic materials.

11. HARVESTING ENERGY
FROM HUMAN BODY
ENERGY HARVESTING FROM HUMAN BODY HEAT:
 The heat from the body can be a source of continuous energy given that the core body temperature is
maintained at 37 °C by the metabolic processes.
 It has been calculated that the whole human body can dissipate 60–180 W depending on the type of activity
performed.
 Thermoelectric devices have been proposed to harvest this energy, and it has been calculated that if this device
has a conversion efficiency of ∼1%, the resulting power produced would be in the range of ~0.6–1.8 W, which is
sufficient to supply energy to many wearable sensors.
 The average energy expenditure for one-person (energy used by the body) is 1.07 × 107 J per day, equivalent to
800 AA (2500 mAh) batteries, which would weigh about 20 kg.This amount of energy can be produced from 0.2
kg of body fat.
WORKING:
https://youtu.be/sj2iiulaCOg?si=ub-iEfdNp4Oti95s

12. HARVESTING ENERGY
FROM HUMAN BODY
CONSTRUCTIONOFTHERMOELECTRIC GENRATORS:
 The basic building block of a thermoelectric generator is a thermocouple. A thermocouple is made up of one p-
type semiconductor and one n-type semiconductor.
 The semiconductors are connected by a metal strip that connects them electrically in series.The
semiconductors are also known as thermoelements, dice or pellets.
WORKING OFTHERMOELECTRIC GENRATORS:
 The Seebeck effect is a direct energy conversion of heat into a voltage potential.
 The Seebeck effect occurs due to the movement of charge carriers within the semiconductors. In doped n-type
semiconductors, charge carriers are electrons and in doped p-type semiconductors, charge carriers are holes.
Charge carriers diffuse away from the hot side of the semiconductor.
 This diffusion leads to a buildup of charge carriers at one end.This buildup of charge creates a voltage
potential that is directly proportional to the temperature difference across the semiconductor.
THERMO ELECTRIC GENRATOR

13. ENERGY HARVESTING FORM HUMAN
TEARS!!
• https://youtu.be/qTdYprFdhyw?si=3Y6VCEcDjajC4zzl

14. APPLICATION
 HAND CRANK GENRATORS:
 Biobatteries, which use the oxidation of blood sugars to
power implanted electronic devices.
 Automatic watches, which use energy from
movement to charge

15. CONCLUSION
 HARVESTING HUMAN POWER TO PRODUCE OTHER ENERGY FORMS IS ONE
OF THE BEST PRACTICE IN ORDER TO FULFILL OUR DEMAND REDUCING THE
GLOBAL WARMING AND LEADING TO AN ECO-FRIENDLY ENVIORNMENT.

16. THANKYOU