why we go for solar

7/29/2019 why we go for solar

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CO2 CYCLE


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What is a carbon footprint?

Carbon footprint (FP):

is the total set of

GHG (greenhouse

gas) emissionscaused directly and

indirectly by an

individual,

organization, event orproduct


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Green House Gases

World GHG emissionsare 34 Gt CO2e / year

The global averagecarbon footprint is ~6

tons CO2e / year /person


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Global Warming

The Earths temperature increases as result of the build-up of heat-

trapping (i.e. greenhouse) gases.

A higher frequency of extreme climatic events (drought, floods) is

predicted.

Coastal flooding due to rising sea level: potential salinization of fresh

groundwater supplies

Change in plant and animal populations increase of some species, potentially pests & pathogens

loss of agricultural crops


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Predictions Based on Present Rate of Global Warming Gas

Emission

Global Mean Temperature Rise of 0.3 C per decade

Non-uniform temperature rise (greater increase in polar regions)

Sea-level rise of 6 cm per decade

Non-uniform increase in rainfall


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OLDEN DAYS

Energy use has changed a greatdeal since people relied solely on

the sun, their own strong bodies

or beasts of burden as energy

resources.

Long ago, people learned how

to use water power to turnpaddle wheels and wind power

for transportation and irrigation.


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People learned to use

the chemical energy

stored in materialslike wood to cook and

heat their homes.


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NOWDAYS ENERGY USAGE

But machines and

technologies are

introduced during theIndustrial Revolution

of the late 18th

century required the

use of other energyresources, especially

fossil fuels.


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Fossil fuels

Fossil fuels like coal,

oil and natural gas

are considered to benonrenewable energy

resources.


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Depletion of Fossil Fuel

Our fossil fuel reserves formed overmillions of years from decaying plants

and animals.

As we use them up, they will not be

replenished in our lifetimes.

With the modern world depending uponcoal, oil and gas for a majority of itsenergy needs and the prediction that theworld will nearly double its need forenergy resources in several decades, itis important to conserve energy and toinvestigate alternate energy resources


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There are many renewableenergy sources that arealternatives to fossil fuels, butsome are not without

controversy. For instance, nuclear power is

used to generate about 25percent of the worldselectricity, but it has inherentrisks, especially in the disposal

of radioactive waste.


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Renewable Energies

Hydroelectric plants use running water togenerate electricity, however they may

flood nearby lands and can disrupt the

normal flow of water, both of which

negatively affect the environment.

Wind power is increasingly being

used as a clean source of

renewable energy.

Turbines harvest wind on wind

farms and generate electricity.


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Consider the alternative

energy options

After this analysis, you need toconsider alternative energy options to

provide energy where and when itsneeded. You do some research todetermine the site- and process-specific energy needs of most of the

rural population and match up theresults with solar-based solutions.


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A small PV system may do

the job

You find that in many instances, a

small photovoltaic system may be the

answer for powering lights, televisionand radio on family farms.

Photovoltaics, you learn, are solar cells

that convert sunlight to electricity.

Depending on the amount of powerneeded, the modules can be wired

together into arrays.


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A 1-kW system can meet

basic needs

For a typical small farm, an array rated

at about 1 kilowatt would provide

sufficient energy to meet the basicelectrical needs of a family of four to

power lights, television, radio, a small

refrigerator and a microwave oven.


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Battery storage is important

But the sun doesnt shine at night,

and even the paradise of Isle de Soleilhas some rainy days. You learn that

regular 12-volt car batteries can store

the solar energy generated during the

day for nighttime use, but new battery

technologies are even better. In

addition, a charge controller installed

between the solar array and the battery


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Solar power is a promising, renewable energy

resource than can be turned into electricity, andit is used in many toys and even home heating.


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Photovoltaics


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PV System Components


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oClean

oSustainable

oFree

oProvide Electricity to RemotePlaces

Advantages of Solar Energy


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Final Thought

Argument that sun provides power only during the day is countered by the fact that 70% ofenergy demand is during daytime hours. At night, traditional methods can be used togenerate the electricity.

Goal is to decrease our dependence on fossil fuels.

Currently, 75% of our electrical power is generated by coal-burning and nuclear powerplants.

Mitigates the effects of acid rain, carbon dioxide, and other impacts of burning coal andcounters risks associated with nuclear energy.

pollution free, indefinitely sustainable.

why we go for solar

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