solar cookers & dryers part 1
DESCRIPTION
1) This Power point contains basic information about solar energy, how can we use solar energy to cook our food and why is it good to use the sun instead of other fuels for cooking ….TRANSCRIPT
Lets get started by refreshing our
knowledge on solar energy.
What are the different types of energy?
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.................& ..............Kinetic
Potential
Chemical
Electrical
Sound
Light heat
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The sun is a source of chemical energy. What types of energy is this chemical energy transferred into? Think about the different senses you observe when the
suns rays hit you.
Chemical
HeatLight
The sun’s diameter is 100x larger than the earth
The Sun is nearly 93 million miles (approx 145 million km) from Earth
145 million km
It takes 8 minutes for the light from the sun to reach the earth. This is called the speed of light.
India has 250 sunny days a year
Interesting facts about the sun:
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Water heaters
Growing cropsDrying washing Solar Panels
Drying foodCooking
Can you think of some uses of solar energy?
It makes it safe to eat
It kills bacteria and prevents illness and disease
We can use solar energy to cook our food. But why is it important to cook food? Is it just to make the food taste
good?
Video of solar cookers in useSee video ‘solar bakery PRINCE India’
How can we use solar energy to cook our food?
Watch this video to find out:
Takes lots of time to gather
Problems with collecting so much wood are:
Leeds to Deforestation
Cooking uses a lot of fuel. In one month a typical rural Indian household uses:
400-600kg of firewood for cooking
Why is it good to use the sun instead of other fuels for cooking?
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So how can we use this to cook if we cant even boil water with this temperature?
The sun as a fuelWhat is the boiling point of water?
100°C
What temperature do we normally get from the sun?
30-40°C
It’s now time for our first activity!