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Green energy-DIY

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Andrew Chen

on 27 July 2013

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Transcript of Green energy-DIY

DIY Green energy
What is DIY?
Solar Oven
Do you remember what solar energy is?
How to make a solar oven
(Biomass energy)

Do you remember Biomass energy?
How to make your own compost!
You need:
Any questions?
Thanks for attending my classes!

I wish you all a good summer and a good future in learning English!
DIY stands for Do-it-yourself.
Today we will learn how to make our own devices that use green energy!
Solar Energy
Solar Energy
Wind Energy
Hydroelectric Energy
Geothermal Energy
Three Gorges Dam at Hubei province, China
Photovoltaic cell
Uses heat from the earth:
Examples: Volcanoes, geysers, or hot springs
The wind powers the fan and gears, which powers the generator.
captures sunlight, and creates electricity
Water flows and turns the turbine, powering the generator.
This is called a Wind Turbine.
Krafla Geothermal Station in Iceland
1.Water is sent to the heat source.
2. The heat source creates steam and sends it up.
3. The steam powers the turbine.
4. The turbine powers the generator.
5. Electricity!
Important words to know:
A machine that makes energy from rotating/spinning parts.
turns the
turbine's energy into
This is a windmill!
Windmill in Talcy, France
Watermill in Belgium
A turbine is
by spinning.

A generator is
by the turbine.
power (verb): Give electricity/energy
Solar energy uses the sun's light to create electricity. PV cells are used for this reason.
The heat from the sunlight can also be used to create electricity.
It's renewable because?
It's environment friendly because?
It's efficient because?
There is sunlight every day!
Sunlight does not cause pollution.
Sunlight is free!
Making a solar oven-and how it works
A solar oven must:
Concentrate sunlight: Using a reflective surface, like glass or metal sheets can focus the sunlight and increase heat.
Convert light to heat: Use a black or dark surface on the food container. Darker colors absorb sunlight the best and easily turn it into heat.
Trap heat: To prevent hot air from escaping, putting a clear plastic bag or glass cover on the top of the food container.
This is very similar to the "green house effect" where light is allowed in, but heat cannot escape. However, the "green house effect" is global.
All you need is:
a Cardboard box
Aluminum foil
a Dark plate or food container
Tape the aluminum foil all over the cardboard box.
Align the box edges so they focus sunlight in the middle.
(use more tape)
Put the food container or plate in the middle where the sunlight is focused.
A solar oven can get as hot as 150 C. You can use it to cook foods over a longer time or boil water.
Biomass Energy
Bioethanol and Biodiesel
Turns trash and organic materials into fuel.
Biomass energy
It's renewable because?
It's environment friendly because?
It's efficient because?
Compost is similar to biomass energy in that it uses organic materials to create a type of "fuel".
In this case, the "fuel" is fertilizer for plants. Compost fertilizer can not only be rich in nutrients, but it is organic and will not harm the environment.
There is a lot of trash!
It's organic!
You are "recycling" trash!(it's free)
Compost is organic matter that has been decomposed and recycled as a fertilizer.
How does compost work?
First, you need organic matter to decompose into compost. Often leftovers or plant materials will do.
Such as grass or leaves!
Natural bacteria, along with worms and fungi will first break down the matter into ammonium, and then into nitrate, which is great for plant fertilizer.
This process is called nitrification.
A bin to store the compost.
A far place to put the bin, since it may be stinky.
Organic material, such as leftovers or plants.
Water, to help with the decomposing.
A shovel, to mix the compost. (this helps spread the bacteria)
Place your bin, and then place organic materials into the bin.
Make sure to add water and mix the bin's insides once a week.
When the compost is finished decomposing, it should be very dark. This means it is full of nutrients for plants!
If you need more compost continue adding organic materials into the bin.
Full transcript