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Why solar?
Our energy
These figures are for a U.K. lifestyle, but we can take this as being representative for people who live in the developed world.”
The bulk of our energy consumption goes on space heating-58%-this is something that can easily be provided for with passive solar design.
Next is water heating, which requires 24 of the energy which we use again, we will see in this book how we can easily heat water with solar energy.
So already we have seen that we can meet 82% of our energy needs with solar technologies! The next 13% of our energy is used to provide electrical power for our lights and home.
In Chapter 10 on solar photovoltaics, we will see how we can produce clean electricity from solar energy with no carbon emissions.
The remaining 5% is all used for cooking again we will see in this book how easy it is to cook with the power of the sun!
So we have seen that all of our energy needs can be met with solar technologies.
Why solar?
The short answer to this question, albeit not the most compelling is “Why not solar?”
Solar energy is clean, green, free, and best of all. isn’t going to be going anywhere for about the next five billion years-now I don’t know about you.
but when the sun does eventually expire. I for one will be pushing up the daisies, not looking on with my eclipse glasses.
For the longer, more compelling answer, you are going to have to read the rest of this chapter. At the end.
I hope that you will be a solar convert and be thinking of fantastic ways to utilize this amazing. environmentally friendly, Earth-friendly technology.
If we look at North America as an example, we can see that there is a real solar energy resource (Figure 1-2).
While the majority of this is concentrated in the West, there is still enough solar energy to be economically exploited in the rest of the U.S.A.!
Renewable versus nonrenewable
At present, the bulk of our energy comes from fossil fuels-gas, coal, and oil. Fossil fuels are hydrocarbons,
that is to say, that if we look at them chemically, they are wholly composed of hydrogen and carbon atoms.
The thing about hydrocarbons is that, when combined with the oxygen in the air and heat, they react exothermically (they give out heat.
This heat is useful. and is used directly as a useful form of energy in itself, or is converted into other forms of energy like kinetic or electrical energy that can be used to “do some work in other words, perform a useful function.
Renewable versus nonrenewable
At present, the bulk of our energy comes from fossil fuels — gas, coal, and oil. Fossil fuels are hydrocarbons, that is to say that if we look at them chemically, they are wholly composed of hydrogen and carbon atoms.
The thing about hydrocarbons is that, when combined with the oxygen in the air and heat, they react exothermically (they give out heat).
This heat is useful, and is used directly as a useful form of energy in itself, or is converted into other forms of energy like kinetic or electrical energy that can be used to “do some work,” in other words, perform a useful function.
So where did all these fossil fuels come from . . . and can’t we get some more?
OK, first of all, the answer is in the question — fossils. Fossil fuels are so named because they are formed from the remains of animals and plants that were around a loooooong time ago.
The formation of these fuels took place in the carboniferous period which in turn was part of the Paleozoic era, around 360 to 286 million years ago.
This would have been an interesting time to live — the world was covered in lots and lots of greenery, big ferns, lush verdant forests of plants.
The oceans and seas were full of algae — essentially lots of small green plants.
Although there are some coal deposits from when T-Rex was king, in the late cretaceous period around 65 million years ago, the bulk of fossil fuels were formed in the carboniferous period.
So what happened to make the fossil fuels?
Well, the plants died, and over time, layers of rock and sediment and more dead stuff built up on top of these carbon-rich deposits.
Over many years, the tremendous heat and pressure built up by these layers compressed the dead matter
LUe have only recently started to worry about fossil fuels — surely we have time yet?
This is an incorrect assumption. For some time, people have prophesized the end of the fossil fuel age.
When the Industrial Revolution was in fullswing Augustin Mouchout wondered whether the supply of fossil fuels would be able to sustain the Industrial Revolution indefinitely.
“Eventually industry will no longer find in Europe the resources to satisfy its prodigious expansion. Coal will undoubtedly be used up. What will industry do then?”
| Author | Evil Genius |
| Language | English |
| No. of Pages | 210 |
| PDF Size | 8.6 MB |
| Category | Education |
Solar Energy Projects Book PDF Free Download