This is a PPT regarding renewable energy and about the modal of solar cooker.

1. RENEWABLE ENERGY
MODEL OF SOLAR COOKER

2. Introduction
Renewable energy – any sustainable energy which comes
from natural resources such as sunlight, wind, tides, rain,
geothermal energy.
Some aspects of Renewable energy
 It exists perpetually and is abundant.
 Ready to be harnessed, inexhaustible.
 Clean alternative to fossil fuels.

3.  About 16% of global final energy
consumptions comes from renewables,
with 10% coming from traditional
biomass (used for heating) and 3.4%
from hydroelectricity.
 New renewables (small hydro, modern
biomass, wind, solar, geothermal, and
bio fuels) accounted for another 3%
consumptions and are growing very
rapidly.
 The electrical generation globally is
mainly from hydroelectricity and the
rest from new renewables.

4. RENEWABLE ENERGY
Biomass
Solar energy
Wind energy
Hydro energy
Geothermal energy

5. HYDRO ENERGY
 Hydro energy is derived from the energy of falling or fast-running water, which
may be harnessed for useful purposes.
HOW IT WORKS
Hydropower plant’s turbine converts the kinetic energy of falling water into
mechanical energy.
Then a generator converts the mechanical energy from the turbine into electric
energy.
ADVANTAGES
• Cheap to operate
• Long life and lower operating cost
DISADVANTAGES
• Human population displacement
• Reduces availability of water downstream

6. WIND ENERGY
Wind energy is the use of wind to provide the mechanical power through wind turbines to
turn electric generators and traditionally to do other work , like pumping.
HOW IT WORKS
• The energy in the wind turns two or three propeller-like blades around a rotor.
• The rotor is connected to the main shaft, which spins a generator to create electricity.
ADVANTAGES
• Very clean source of energy
• No pollution during operation
DISADVANTAGES
• Energy storage issues
• Only practical in areas that are windy enough
• Requires large amount of land

7. SOLAR ENERGY
Solar energy refers to capturing the energy from the sun and subsequently
converting it into electricity.
HOW IT WORKS
It works by capturing sun’s energy and turning into electricity through solar panel.
ADVANTAGES
• Renewable and free
• Very clean source of energy
• Low operating cost
DISADVANTAGES
• Energy storage issues
• Low energy density

8. BIOMASS ENERGY
Biomass energy is the use of living and recently dead biological material as energy
source.
HOW IT WORKS
When biomass is burned, the chemical energy in biomass is released as heat.
Biomass can be burned directly or converted to liquid biofuels or biogas that can
be burned as fuels.
ADVANTAGES
• Versatile
• Emit less SO2 and NO2 than fossil fuels
DISADVANTAGES
• Low energy density
• Problems associated with intensive agriculture like soil erosion

9. GEOTHERMAL ENERGY
Geothermal energy is thermal energy generated and stored in the earth.
HOW IT WORKS
Uses earth’s heat to convert water into steam, this steam spins a turbine, which is
connected to generator that produces electricity.
ADVANTAGES
• Easy to exploit in some areas
• High net energy yield
DISADVANTAGES
• Not available everywhere
• Produces some water pollution

10. MODEL OF SOLAR COOKER
A solar cooker is a device which uses the energy of
direct sunlight to heat or cook food materials.
NEED FOR SOLAR COOKER
 Half the world’s population burn wood or dried
dung to cook
 Wood cut for cooking purposes contributes to
the 16 million hectares of forest destroyed
annually
 People are exposed to indoor air pollution as a
result of burning solid fuels for cooking and
heating

11. Classification
1. Direct Type : Use some solar energy concentrator to focus sunlight onto
an area. Ex :
Parabolic solar cooker
2. Indirect Type : A box covered with transparent material like glass. Employs
greenhouse effect for cooking. Ex :
Solar box cooker
3. Advanced Type : The cookers use either a flat piece or focusing collector,
which collect the solar heat and transfer this to the cooking vessel.
Ex : Thermal storage solar cooker

12. Common Types of Solar Cookers
 Box Cooker
 Panel Cooker
 Parabolic Cooker

13. Working
 Consists of an insulated box with a glass or a plastic
window.
 The window acts as a solar energy trap by exploiting the
greenhouse effect.
 Solar radiation passes through the window, and is
absorbed by the walls, the bottom of the cooker and the
cooking utensils.
 To maximize the heating effect, the walls, and outer side of
the pots should be painted black

14. Bibliography :
// google.com
// en.Wikipedia.org/wiki/Renewable_resource
// www.renewsindia.com

15. THANK YOU