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Unit of Energy and Introduction of Bioenergy

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231. Geothermal 101 – How to heat your home with 400% efficiency

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Geothermal is the heating system of the future. With efficiencies of 400% and no emissions it’s just the ticket for fighting climate change and oh, it’s also 700% efficient at air conditioning, perfect for those 40 Celsius summer heat waves. This week on Green Energy Futures we talk to Devon Winczura and Steve Oslanski of Envirotech Geothermal who show us why geothermal heating and cooling is the wave of the future.
Check out our blog and CKUA Podcast at GreenEnergyFutures.ca

Bioenergy

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Fossil fuels provide 95% of the world’s total energy, yet are considered to be the largest contributing factor to global warming.

Will you help us to develop sustainable solutions to secure future energy supplies?

http://www.nottingham.ac.uk/impactcampaign
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Renewable Energy: How does hydropower work?

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Hydropower or hydroelectricity is the creation of energy from fast-flowing water to generate electricity. Come behind the scenes of a hydropower station to learn how hydropower works.

Visit our website: www.hydro.com.au
Follow us on Facebook: www.facebook.com/hydrotasmania
Sign up for our newsletter: www.hydro.com.au/the-spill

Transcript:

Hydro Tasmania is Australia’s largest clean energy provider and the largest provider of renewable energy in Australia.

Do you know how we generate electricity from water? This is sometimes referred to as hydroelectricity or hydropower.

It’s all about utilising the two forms of energy that water contains, potential and kinetic, and transferring it into electrical energy.

Potential energy, also known as stored energy, is gained by the construction of dams in varying design along natural waterways.

The water is captured both directly from rain as well as inflows from adjacent rivers, creeks, streams and melting snow.

We can also increase the size of existing lakes by diverting inflows and blocking outflows. An example of this being the Great Lake in our Central Highlands.

As the water rises behind the dam wall the dam’s water becomes a potential energy reservoir. When the demand for electrical energy occurs the stored water is released from the catchment by opening an intake gate or inlet valve.

As all hydropower stations are built lower than the water catchment itself. The water is connected via a combination of canals, tunnels and pipes into the power station below.

The power stations are sometimes built underground. Depending on the type of turbine, the water either flows through or directly hits the turbine runner and causes it to spin. The height between the reservoir and the hydropower station determines how fast and with how much power the energy of water will travel and be transferred to electrical energy.

The energy of the moving water has now transferred to mechanical energy and after it passes through the turbine is released back into the river below the power station.

In addition to generating electricity and through controlled methods, a measured amount of stored water can be released into the downstream river to maintain waterways for both recreation and aquatic life.

Above the spinning turbine is a shaft which connects to the generator. Inside the generator is a rotor and a stator. The rotor contains many magnets. The rotor spins inside the stator which is filled with copper windings.

Now the mechanical energy is transformed into electrical energy which is carried by the copper wire and fed into a transformer.

The voltage is increased to allow for the efficient transmission of energy to a substation near your town, where it is then stepped back down to a lower voltage. The energy is distributed throughout the town or city where it is further stepped down to 415 or 240 volts.

The energy generated from water helps power Tasmanian households and businesses. It’s also sold into the national grid supporting Australia’s transition to a renewable energy future.

And that’s how hydropower works!

Can Underwater Turbines Solve Our Energy Problems?

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References
A great deal of information in this video was found through phone interviews with Simec Atlantis engineers
[1] 4,170 TW is annual US energy production (table 1.1 here) – US wave power potential is ~2000TW, according to this 2011 DOE report
[2] https://www.iea.org/topics/renewables/ocean/
[3] https://www.youtube.com/watch?v=pwChk4S99i4
[4] Figure 9.6 and 9.7 on page 82 https://tethys.pnnl.gov/sites/default/files/publications/MeyGen-2012-ES.pdf
[5] https://tethys.pnnl.gov/sites/default/files/publications/La_Rance_Tidal_Power_Plant_40_year_operation_feedback.pdf
[6] https://tethys.pnnl.gov/annex-iv-sites/sihwa-tidal-power-plant
[7] Page 19 https://tethys.pnnl.gov/sites/default/files/publications/La_Rance_Tidal_Power_Plant_40_year_operation_feedback.pdf
[8] https://tethys.pnnl.gov/sites/default/files/publications/Final_EMP_report_SeaGen.pdf
[9] https://www.power-technology.com/projects/strangford-lough/
[10] http://icomps.co.uk/seagen-decommissioned-after-successfully-delivering-11-6gwh-to-the-national-grid/
[11] https://www.seai.ie/publications/Renewable-Energy-in-Ireland-2019.pdf
[12] Page 14 https://www.climatexchange.org.uk/media/3100/state-of-the-wave-and-tidal-industry-report.pdf
[13] https://www.bt-projects.com/wp-content/uploads/documents-public/Environment/RHK-2011-SeaGen-Environmental-Monitoring-Programme.pdf
[14] http://www.renewableenergyfocus.com/view/13491/meygen-to-develop-400-mw-uk-tidal-power-site/
[15] https://vimeo.com/237566185
[16] Figure 11.2 and 11.3 page 114 https://tethys.pnnl.gov/sites/default/files/publications/MeyGen-2012-ES.pdf
[17] Page 154 https://tethys.pnnl.gov/sites/default/files/publications/MeyGen-2012-ES.pdf
[18] Page 43 https://tethys.pnnl.gov/sites/default/files/publications/Final_EMP_report_SeaGen.pdf
[19] Page 39 https://tethys.pnnl.gov/sites/default/files/publications/Final_EMP_report_SeaGen.pdf
[20] Page 17 https://tethys.pnnl.gov/sites/default/files/publications/MeyGen-2012-ES.pd
Thank you to AP Archive for access to their archival footage.

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Tweaking a CPU for power efficiency: Underclocking vs Undervolting vs Eco mode

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I compare many different ways of tweaking a CPU to increase efficiency and lower power consumption to see what methods work best for which use cases.
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How Do Wind Turbines Work? | Sources Of Electric Energy | The Dr Binocs Show | Peekaboo Kidz

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How Do Wind Turbines Work? | Sources Of Electric Energy | Electricity | Wind Turbines Explained | Wind Mill | Wind Mill History | Wind Turbines Structure | Electric Energy | Wind Energy | Wind Generated Electricity | Wind Turbines Video For Kids | Video For Kids | Science Videos | Best Kids Show | Dr Binocs Show | Peekaboo Kidz

Hey kids, in this video, Dr Binocs will explain How Do Wind Turbines Work? | The Dr Binocs Show | Peekaboo Kidz

Make sure you watch the whole video to know all the answers to your curious questions!

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Class 11th – Efficiency of a Machine | Work, Energy and Power | Tutorials Point

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Efficiency of a Machine
https://www.tutorialspoint.com/videotutorials/index.htm
Lecture By: Mr. Pradeep Kshetrapal, Tutorials Point India Private Limited
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What is Tidal Energy?

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What is Tidal Energy?

Renewable energy is energy that is replenished by nature so that it can be used over and over again. Tidal energy is produced by the surge of ocean waters during the rise and fall of the tides.

The world’s oceans are extremely powerful, and the tides are no different. With tidal energy, we can harness some of this vast energy from the changing tides and tidal currents.

The gravity between the Moon, the Earth and the Sun combine to move the tides in and out. The tides change at predictable times linked to the cycle of the moon. In some parts of the world, the speed and the difference in height of the tides is greater, because of the local geography and the Earth’s tilt. By placing devices that harness some of the tidal energy in these narrow channels we can generate electricity that can power communities, and contribute to the power requirements of towns and cities.

With climate change becoming a greater concern, it is our job to find alternative ways to provide energy. Ways that are more available and sustainable than fossil fuels. Tidal energy can play a big part in the solution, as it is renewable, predictable and, if combined with storage, is highly flexible.

Brought to you by http://taoide.eu/ and http://www.marei.ie/
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Bioenergy

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Bioenergy

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