Introduction to Wind Power - By MITK12Videos
Transcript
| 00:12 | Yeah . Mhm . Mankind has been harnessing wind to | |
| 00:25 | do useful work for centuries . Over 2000 years ago | |
| 00:28 | , Chinese and Persian engineers independently developed the first windmills | |
| 00:32 | to pump water for irrigating crops When mills first appeared | |
| 00:35 | in europe during medieval times , where they were used | |
| 00:37 | for agricultural and industrial purposes . This windmill is an | |
| 00:41 | example of a classic Dutch style windmill built in the | |
| 00:44 | 1800s . The blades were once covered with canvas to | |
| 00:47 | catch the wind , although these early windmills were not | |
| 00:49 | very efficient by today's standards , The ways in which | |
| 00:52 | they increased production at the time made them a useful | |
| 00:54 | tool . Modern electricity generating wind turbines first appeared in | |
| 00:58 | the late 1800s . However , it wasn't until the | |
| 01:00 | energy crisis of the 1970s when the focus shifted to | |
| 01:03 | the large scale development of wind power . By the | |
| 01:06 | late 1990s , large wind farms started to appear in | |
| 01:08 | wind generated electricity became commercially available . Modern wind turbines | |
| 01:18 | consist of three parts rotor blades nestle in tower . | |
| 01:25 | Most wind turbines have three rotor blades that can be | |
| 01:27 | up to 100 ft long . The blades convert wind | |
| 01:30 | energy into mechanical energy . Wind turbine blades look much | |
| 01:34 | like an airplane wing that curved on the top and | |
| 01:37 | flat on the bottom . The air flowing over the | |
| 01:39 | top of the blade has to take a slightly longer | |
| 01:42 | path and therefore move faster in order to keep up | |
| 01:45 | with the air flowing under the blade . Bernoulli's principle | |
| 01:50 | dictates that this difference in air speed would create a | |
| 01:53 | pressure difference to develop across the blade . This pressure | |
| 01:56 | difference is the origin of the lifting force that allows | |
| 02:00 | for the blades of the turbine to rotate the nestle | |
| 02:05 | houses the inner workings of the wind turbine that are | |
| 02:07 | responsible for electrical power generation . All three rotor blades | |
| 02:11 | are attached at the hub . The hub slowly turns | |
| 02:14 | a shaft connected to the gearbox , which turns a | |
| 02:16 | faster shaft in order to power the electrical generator . | |
| 02:19 | Electrical power is then distributed to customers via the electrical | |
| 02:22 | grid . The average utility scale wind turbine has a | |
| 02:26 | two megawatt capacity , which is enough to power about | |
| 02:29 | 500 average sized homes . The tower supports the structure | |
| 02:33 | of the wind turbine and lifts the rotor blades high | |
| 02:35 | above the ground into stronger , more continuous winds . | |
| 02:38 | Towers can be 250 ft tall in this experiment will | |
| 02:42 | use a scale model of a wind turbine to generate | |
| 02:44 | electricity . This particular model is 2.5 ft tall , | |
| 02:48 | with one ft long blades . This is about 100 | |
| 02:51 | times smaller than the average utility sized turban . However | |
| 02:54 | , it has all the same parts , the tower | |
| 02:57 | venice L in the rotor blades . Right now , | |
| 03:04 | wind energy is being transformed to electrical energy by the | |
| 03:07 | wind turbine . The volt meter is measuring how much | |
| 03:11 | electricity is being produced by the turban . The turbine | |
| 03:15 | is producing about 0.8V , which is enough electricity to | |
| 03:19 | light a small led . What changes could we make | |
| 03:23 | to produce more electricity , pause this video and brainstorm | |
| 03:26 | Some changes . Some ways to increase the turban output | |
| 03:31 | include faster wind , changing the blade angle , using | |
| 03:36 | longer blades having a larger generator . Wind power has | |
| 03:42 | its supporters in its opposition . Let's take some time | |
| 03:44 | to consider the pros and cons of wind power . | |
| 03:48 | Some advantages of wind power include wind turbines used the | |
| 03:51 | wind a natural and renewable source of energy to generate | |
| 03:54 | electricity . Fossil fuels are required to produce and construct | |
| 03:58 | wind turbines , but they're no longer a factor . | |
| 04:00 | Once the turbine is up and running , most wind | |
| 04:02 | power costs are associated with turban installation . Wind turbines | |
| 04:07 | can be constructed almost anywhere . They are consistent and | |
| 04:09 | favorable winds . Some disadvantages of wind power include presently | |
| 04:15 | , wind power infrastructure is only capable of supplementing other | |
| 04:18 | non renewable technologies . Studies suggest that the noise and | |
| 04:22 | light flicker from wind turbines may cause illness , and | |
| 04:24 | people who live close by . Some environmentalists believe that | |
| 04:27 | large wind farms can impact the behavior of local wildlife | |
| 04:30 | . Construction of wind turbines does not affect all local | |
| 04:33 | residents equally . Some may obstruct views and decrease property | |
| 04:35 | values . Do the global benefits of wind power outweigh | |
| 04:39 | the local downsides . This is a question for all | |
| 04:42 | of us to discuss as we face the uncertain future | |
| 04:44 | of our environment and energy needs . Mhm . |
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Introduction to Wind Power is a free educational video by MITK12Videos.
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