Environment Technology

Environment Technology

Which renewable energy source has the greatest net energy yield?

Posted by admin on July 30, 2012 in Renewable Energy with 5 Comments


Which Renewable Energy source has the greatest net energy yield?
A. Solar Energy
B. Hydroelectric
C. Wind
D. Biomass
E. Hydrogen Fuel
F. Geothermal

And please explain why you picked the answer , for example :

F , Geothermal , this is beacuse …….

Thanks , i need the answer+explaination by tonight .

Geothermal As A Green Energy Source
——————————————————————————————————————————————-

Geothermal energy is energy obtained by tapping heat from the earth itself. This comes from magma and the radioactive decay of uranium, thorium, and potassium.

The downside to geothermal energy is the fact that it is expensive to build. On the other hand, because the earth’s crust continuously decays replenishing the heat, it is still a renewable source of energy.

There are three types of geothermal plants around. These are namely dry steam, flash, and binary.

Dry steam plants take steam out of fractures in the ground and use it to directly drive a turbine that spins a generator.

Flash plants take on water at temperatures over 200 °C, out of the ground, and allows it to boil as it rises to the surface then separates the steam phase in steam/water separators which runs the steam through a turbine to generate electricity.

Last, you have binary plants. Here, hot water flows through heat exchangers and that boiling organic fluid is what spins the turbine.

Once power is generated, the condensed steam and remaining geothermal fluid from all three types of plants are injected back into the hot rock to pick up more heat.

Geothermal plants are used operational in different parts of the globe. These are usually located in geologically unstable parts of the planet. You can see some in Chile, Iceland, New Zealand, United States, the Philippines and Italy. At home, two most prominent areas for this are in the Yellowstone basin and in northern California.

If you were to compare the amount of energy collected from geothermal to solar, you still get more from the sun. Despite that, people should still use it since solar energy cannot be harnessed when the clouds block the sun’s rays from reaching the solar panels.

Geothermal energy is a green energy source just like wind, hydropower and biofuel because it is a renewable. By maximizing its potential, we don’t have to worry about the price of oil in the world market when it hit more than $110 a barrel and is now under $40 in the world market.

But that is not the only thing we should be concerned about. We should also do our best to protect the environment given that coal fired and nuclear power plants produce harmful gases and radioactive waste that may cause to people and the surrounding areas.

———————————————————————————————————————————————–

Why Is Hydropower A Green Energy Source?

Why is hydropower a green energy source? It is because we are able to harness electrical power by converting water into electricity.

The use of hydroelectric power or even hydroelectricity dates back to Ancient Greece and China when they installed waterwheels in rapidly flowing rivers to turn millstones and other equipment. Years later, this was used in the New World which is now known as North America to power saws and other equipment.

But the hydroelectric plants of today still use the same basic principles as the historical waterwheel with some variations. The difference is that we use the force of the power to push the turbine which in turn powers a generator thus generating electricity.

To make sure that there is a steady flow of power being produced, a dam has to be built to retain the water. If there is a need for more power, the gates of the dam are opened so water can be released. During non-peak, the gates are closed. To ensure there is water at all times, some dams have a recovery and pumping systems to the water released can be used again.

There are issues with the use of hydroelectricity. Some claim that it poses a problem for fish and aquatic plants on both sides of the dam. Because the flow of water has been altered, the nutrient rich silt which helps crops grow could be affected which is exactly what happened when the Aswan Dam was completed in Egypt.

Lastly, you have ocean thermal energy. Here, you get power based on the different temperatures in the water. For this to work, you need at least 38 degrees Fahrenheit difference between the warmer surface water and the colder deep ocean water. Still in the trial stage, it is used Japan and Hawaii.

Hydropower is a green energy source. It is safe to use and what is even better is that it is renewable.

———————————————————————————————————————————————–

My answer is : Hydro and Geothermal

« previous post

How do scientists feel Global ...

How do scientists feel Global warming will affect the ocean levels? Do you believe Global ...

next post »

Clean Nation – Renewable....

Become a partner of Renewable Clean Energy and reduce our dependence on foreign oil while ...

  1. LJuly 30, 2012 - 9:08 pm #1

    Solar Energy
    Solar panels give off no pollution, the only pollution produced as a result of solar panels is the manufacturing of these devices in factories, transportation of the goods, and installation.
    The production of energy from the use of fossil and some renewable fuels (e.g. wind turbines) can be noisy, yet solar energy produces electricity very quietly.
    One of the great pros of solar energy is the ability to harness electricity in remote locations that are not linked to a national grid. A prime example of this is in space, where satellites are powered by high efficiency solar cells.
    The installation of solar panels in remote locations is usually much more cost effective than laying the required high voltage wires.
    Solar energy can be very efficient in a large area of the globe, and new technologies allow for a more efficient energy production on overcast/dull days.
    Solar panels can be installed on top of many rooftops, which eliminates the problem of finding the required space for solar panel placement.
    Another great pro of solar energy is the cost. Although the initial investment of solar cells may be high, once installed, they provide a free source of electricity, which will pay off over the coming years.
    The use of solar energy to produce electricity allows the user to become less dependent on the worlds fossil fuel supplies.

    the only problem with solar energy is the fact that it can only produce energy in daylight hours.

    if you are in an area where running water is available then Hydroelectric is your best bet,
    Dams can store rain water or water directly from the river itself. Then, in case of a Drought, the dam will still have a relatively constant supply of water.
    Producing Power.
    Controls flooding & provides recreational activities such as boating fishing and swimming, if the lake is not being used for drinking water (Dam Society).
    Simple design makes for inexpensive repairs and maintenance costs (Dam Society).
    Produce inexpensive (after completion) and clean power.
    Renewable energy source, because the water is not destroyed by passing through the dam.
    If needed, dams can be shut down instantly, where thermal plants take hours, and nuclear plants can take days! (Dam Society).
    Very few breakdowns.

    those would be my first two choices.
    References :

  2. Dan PowellJuly 30, 2012 - 9:34 pm #2

    It depends what you mean by ‘net energy yield’.

    To me it is A. Solar Energy because:

    1. it can provide useful energy without costing a homeowner anything (e.g. keep the window shades open in the winter to have solar energy help heat the house; plus just washed and web clothes on the laundry line to have solar energy dry them; etc.)
    2. it can be used for numerous applications such as solar PV panels for electricity, solar air heater to provide hot air to help heat a home in the winter, solar hot water heating on the roof top any time of the year, green houses to heat vegetable and garden plants, etc.

    I hope that helps.
    References :
    http://dailyhomerenotips.com/projects-listing/

  3. SteveJuly 30, 2012 - 9:47 pm #3

    Your ? is incomplete; you have to say "net energy yield per __ X__" where ‘X’ represents some kind of input to attain the yield.

    If X = $ investment, geothermal is clearly the winner; drill a hole in the ground, connect an input and output pipe with a small pump & working fluid. Eternal free heat energy is thereby available which can be used directly or easily converted to electricity, the most useful form of energy. The initial cost is amortized in the least amount of time, and the maintenance of the machinery is minimal.
    References :

  4. virtualguy92107July 30, 2012 - 10:08 pm #4

    Right now the answer is B, hydro electric because we have built more generating capacity into dams than into windmills or solar electric. Solar has the greatest potential capacity.
    References :

  5. Alex FigueroaJuly 30, 2012 - 10:40 pm #5

    Geothermal As A Green Energy Source
    ——————————————————————————————————————————————-

    Geothermal energy is energy obtained by tapping heat from the earth itself. This comes from magma and the radioactive decay of uranium, thorium, and potassium.

    The downside to geothermal energy is the fact that it is expensive to build. On the other hand, because the earth’s crust continuously decays replenishing the heat, it is still a renewable source of energy.

    There are three types of geothermal plants around. These are namely dry steam, flash, and binary.

    Dry steam plants take steam out of fractures in the ground and use it to directly drive a turbine that spins a generator.

    Flash plants take on water at temperatures over 200 °C, out of the ground, and allows it to boil as it rises to the surface then separates the steam phase in steam/water separators which runs the steam through a turbine to generate electricity.

    Last, you have binary plants. Here, hot water flows through heat exchangers and that boiling organic fluid is what spins the turbine.

    Once power is generated, the condensed steam and remaining geothermal fluid from all three types of plants are injected back into the hot rock to pick up more heat.

    Geothermal plants are used operational in different parts of the globe. These are usually located in geologically unstable parts of the planet. You can see some in Chile, Iceland, New Zealand, United States, the Philippines and Italy. At home, two most prominent areas for this are in the Yellowstone basin and in northern California.

    If you were to compare the amount of energy collected from geothermal to solar, you still get more from the sun. Despite that, people should still use it since solar energy cannot be harnessed when the clouds block the sun’s rays from reaching the solar panels.

    Geothermal energy is a green energy source just like wind, hydropower and biofuel because it is a renewable. By maximizing its potential, we don’t have to worry about the price of oil in the world market when it hit more than $110 a barrel and is now under $40 in the world market.

    But that is not the only thing we should be concerned about. We should also do our best to protect the environment given that coal fired and nuclear power plants produce harmful gases and radioactive waste that may cause to people and the surrounding areas.

    ———————————————————————————————————————————————–

    Why Is Hydropower A Green Energy Source?

    Why is hydropower a green energy source? It is because we are able to harness electrical power by converting water into electricity.

    The use of hydroelectric power or even hydroelectricity dates back to Ancient Greece and China when they installed waterwheels in rapidly flowing rivers to turn millstones and other equipment. Years later, this was used in the New World which is now known as North America to power saws and other equipment.

    But the hydroelectric plants of today still use the same basic principles as the historical waterwheel with some variations. The difference is that we use the force of the power to push the turbine which in turn powers a generator thus generating electricity.

    To make sure that there is a steady flow of power being produced, a dam has to be built to retain the water. If there is a need for more power, the gates of the dam are opened so water can be released. During non-peak, the gates are closed. To ensure there is water at all times, some dams have a recovery and pumping systems to the water released can be used again.

    There are issues with the use of hydroelectricity. Some claim that it poses a problem for fish and aquatic plants on both sides of the dam. Because the flow of water has been altered, the nutrient rich silt which helps crops grow could be affected which is exactly what happened when the Aswan Dam was completed in Egypt.

    Lastly, you have ocean thermal energy. Here, you get power based on the different temperatures in the water. For this to work, you need at least 38 degrees Fahrenheit difference between the warmer surface water and the colder deep ocean water. Still in the trial stage, it is used Japan and Hawaii.

    Hydropower is a green energy source. It is safe to use and what is even better is that it is renewable.

    ———————————————————————————————————————————————–

    My answer is : Hydro and Geothermal
    References :
    http://greenproductsolutionpr.com/EnergySource.html
    http://sunpowerenergyforhomes.com

Leave a Reply

No trackbacks yet.

No post with similar tags yet.

Posts in similar categories
Optimization WordPress Plugins & Solutions by W3 EDGE