ALTERNATIVE/ALTERNATIVE/RENEWABLE ENERGYRENEWABLE ENERGY

CONTENTCONTENT

Renewable energy sources : Renewable energy sources : solar,wind,hydro,biomass,geothermalsolar,wind,hydro,biomass,geothermal

Fossil fuels vs. renewable sources Fossil fuels vs. renewable sources EnvironmentalEnvironmental aspects (global aspects (global

warming,CO2 emission,climate warming,CO2 emission,climate changes..) changes..)

Other aspects(World’s Energy Needs,Why Other aspects(World’s Energy Needs,Why fossils still used,energy cost..) fossils still used,energy cost..)

*Thesis:THERE IS AN ALTERNATIVE*Thesis:THERE IS AN ALTERNATIVE

Renewable Energy Resources / Solar / page 3

EEC6120Introduction to Electrical Supplyand Installation

EEC6120Introduction to Electrical Supplyand InstallationDepartment of Electrical Engineering (Haking Wong)Department of Electrical Engineering (Haking Wong)

© Vocational Training Council, Hong Kong.

What is Renewable energy ?

What is Renewable energy ?

• ‘ any sustainable energy source that comes from natural environment.’

It means energy is generated from absolutely natural powers and this energy sources can be replenished.

Renewable Energy Resources / Solar / page 5

EEC6120Introduction to Electrical Supplyand Installation

EEC6120Introduction to Electrical Supplyand InstallationDepartment of Electrical Engineering (Haking Wong)Department of Electrical Engineering (Haking Wong)

© Vocational Training Council, Hong Kong.

As the name suggests, exists perpetually and in abundant in the environment

Ready to be harnessed, inexhaustible

It is a clean alternative to fossil fuels

“energy that is derived from natural process that are replenished constantly” -- defined by the Renewable Energy Working Party of the International Energy Agency

What is Renewable Energy?What is Renewable Energy?

Natural energy sources

• SOLAR ENERGY (the power comes from the sun and it can turned into electricity and heat)

• WIND POWER (conversion of wind energy into electricity)

• HYDRO POWER ( the power of water)

• BIOMASS (organic materials from plants)

Renewable vs. Non-renewable

Conventional energy sources

• These are fossil fuels;coal,oil,petroleum and natural gas.

• Fossil fuels,that contain hydrocarbons, found top layer of the Earth’s crust.

• ‘Non-renewable’ sources;they cannot be produced again after they have been used.

• They produce a lot of pollution and environmental problems.

ENVIRONMENTAL ASPECTS• Fossil fuels such as coal and oil contain carbon,when they

burn,CO2 is produced and released into the atmosphere.This causes an increase in the level of CO2 and increase of CO2 level causes an increase in average global temperature which is ‘ global warming ’ or GHE.It’s a threat for the future of our planet.

• But, there aren’t any CO2 emission in alternative sources.They have only little harms when are used improperly.For example, if a solar panel is charged in night,it can cause chemical reactions and harm,but it doesn’t threaten to whole planet.Renewable energy technologies are clean sources of energy that have a much lower environmental impact than conventional energy technologies.

GLOBAL THREAT

Can alternative energy supply the World’s Energy Needs?

Can they be used instead of anti-environmental sources all over the world?

Global Consumption and Global Consumption and Alternative productionAlternative production

production

usage

WHY FOSSIL FUELS ARE STILL USED ??

Just because of their costs?..

Energy Cost

•Solar 32$cent/kwH,but coal 4$cent/kwH …•Costs are the main reason of energy consumption•But,fossil fuel reserves will be exhausted.

THERE IS AN ALTERNATIVE• Cost is important but environmental harms of fossil fuels,consumption of fossil reserves push us to develop the usage of renewable and sustainable energy sources; high costs of renewables are started to go down.

• So,it’s clear that renewable energy sources should be increased all over the world. !

CONCLUSION we need renewable energy

• Renewable energy technologies are clean sources of energy that have a much lower environmental impact than conventional energy technologies.

Renewable energy will not run out. Ever. Other sources of energy are finite and will some day be depleted.

Thank u for listening me ))