1 00:04:30,080 --> 00:04:31,300 Welcome back 2 00:04:31,500 --> 00:04:34,480 this part of the series of videos on renewable energy, we're going to talk 3 00:04:34,480 --> 00:04:38,520 about the one that most people will instantly recognize. 4 00:04:38,520 --> 00:04:39,820 Wind. 5 00:04:39,820 --> 00:04:44,180 Wind is driven by the sun. 6 00:04:44,280 --> 00:04:48,260 Obviously, differential pressures in areas of atmosphere, 7 00:04:49,120 --> 00:04:52,660 warm air rises causes a vacuum, cool air rushes into it. 8 00:04:52,960 --> 00:04:56,100 Creating wind that's all it is, it's kinetic energy. 9 00:04:56,520 --> 00:05:00,340 We take that kinetic energy and we turn it into 10 00:05:00,340 --> 00:05:03,520 kinetic rotational energy through the use of 11 00:05:05,200 --> 00:05:06,180 wind turbine. 12 00:05:06,180 --> 00:05:08,720 That's a horizontal axis wind turbine. 13 00:05:09,420 --> 00:05:11,980 Therefore, the blades sit and face into the wind. 14 00:05:12,760 --> 00:05:14,500 There are different types of wind turbine. 15 00:05:14,500 --> 00:05:16,780 They are actually working on 16 00:05:16,900 --> 00:05:19,840 a vertical sail, which doesn't actually rotate, 17 00:05:20,680 --> 00:05:23,980 and we also have vertical axis wind turbines. 18 00:05:24,340 --> 00:05:26,400 You will see these coming up more and more. 19 00:05:26,400 --> 00:05:28,180 They take up less room. 20 00:05:28,180 --> 00:05:30,520 They're not quite as efficient, 21 00:05:30,520 --> 00:05:32,620 but they're not as noisy 22 00:05:32,800 --> 00:05:36,320 and they don't cause as much of, well, I don't see them as an eyesore. 23 00:05:36,320 --> 00:05:38,260 I quite like see the wind turbines. 24 00:05:38,260 --> 00:05:40,420 I think they look, they look great. 25 00:05:40,420 --> 00:05:44,880 And it shows our advancement into renewable technologies 26 00:05:44,880 --> 00:05:47,360 it is a little marker saying we are trying. Now we 27 00:05:51,520 --> 00:05:54,080 use sails as these are. 28 00:05:54,080 --> 00:05:56,920 call them sails. The wind hits the sail. 29 00:05:57,000 --> 00:06:02,760 The sail has an angle which can be altered depending on strength of the wind. 30 00:06:03,300 --> 00:06:06,400 So therefore, in a 30 knot wind, the sails will be feathered 31 00:06:06,400 --> 00:06:09,120 slightly, causing less drag. 32 00:06:09,460 --> 00:06:12,480 Therefore, the speed of the 33 00:06:14,140 --> 00:06:16,820 actual turbine itself 34 00:06:16,820 --> 00:06:19,860 will match the speed that it will turn at low wind speeds. 35 00:06:19,860 --> 00:06:22,420 So therefore they have an optimum rotation 36 00:06:23,320 --> 00:06:27,940 rotational speed, rotational velocity that drives the generator 37 00:06:28,080 --> 00:06:29,100 through a gearbox. 38 00:06:29,100 --> 00:06:31,200 So you have basically 39 00:06:33,760 --> 00:06:34,320 windmill. 40 00:06:35,980 --> 00:06:38,220 This is called a nacelle. 41 00:06:38,220 --> 00:06:41,880 That's the pylon. Inside the nacelle. 42 00:06:41,880 --> 00:06:46,120 there is a gearbox, a braking system. 43 00:06:46,120 --> 00:06:48,060 Now the must be braking system in there. 44 00:06:48,060 --> 00:06:50,520 I'm sure people have seen on YouTube. 45 00:06:50,880 --> 00:06:53,940 When a wind turbine goes into runaway 46 00:06:55,140 --> 00:06:57,220 braking system fails, they burn. 47 00:06:57,220 --> 00:07:00,100 So there must be some form of braking system on there. 48 00:07:00,100 --> 00:07:04,260 There will be seven motors that actually alter the pitch of the blades 49 00:07:05,140 --> 00:07:07,900 in the wind to create a greater 50 00:07:08,160 --> 00:07:12,100 or lesser rotational velocity behind the gearbox. 51 00:07:12,100 --> 00:07:15,820 There will be a shaft onto a generator, and all that does 52 00:07:16,200 --> 00:07:18,400 is either turn magnets 53 00:07:18,980 --> 00:07:21,780 in a coil of wire 54 00:07:21,780 --> 00:07:24,420 or coil of wire inside magnets. 55 00:07:24,860 --> 00:07:28,120 Basically, the relationship between electromagnetism 56 00:07:29,020 --> 00:07:33,860 creates a electrical charge to flow. 57 00:07:33,860 --> 00:07:39,300 This is then passed back to the mainland because most wind farms now are offshore. 58 00:07:39,720 --> 00:07:42,820 The reason behind that is they are less obtrusive. 59 00:07:42,840 --> 00:07:45,180 They're less of an eyesore. 60 00:07:45,180 --> 00:07:46,340 We've all seen it. 61 00:07:46,340 --> 00:07:48,640 I don't want a wind farm in my backyard. 62 00:07:48,640 --> 00:07:49,300 Pure and simple. 63 00:07:49,300 --> 00:07:51,300 So they said, I'll tell you what we'ss put them offshore, 64 00:07:51,300 --> 00:07:53,580 which is a good thing because you get a constant breeze, 65 00:07:54,780 --> 00:07:55,920 either onshore or offshore. 66 00:07:55,920 --> 00:07:57,100 It depends whether it's the night or the day. 67 00:07:57,100 --> 00:07:59,020 Again, it's differentials in pressure 68 00:07:59,020 --> 00:08:02,940 caused by the warming of the atmosphere, the land and the sea by the Sun. 69 00:08:03,240 --> 00:08:07,560 So in effect, we are still harnessing the sun's power 70 00:08:07,560 --> 00:08:13,080 because most of the power we get in renewable technologies is from the sun. 71 00:08:13,560 --> 00:08:16,320 Photons warm things up. 72 00:08:16,320 --> 00:08:18,860 When you warm things up, you get differential of pressure. 73 00:08:19,740 --> 00:08:23,760 Photons also act on the electrons to do certain things, 74 00:08:23,760 --> 00:08:26,200 which we'll come onto later in another video. 75 00:08:26,200 --> 00:08:28,140 But the sun warms the air, 76 00:08:28,140 --> 00:08:31,560 the air rises, as I said before it rushes in and turns the blades. 77 00:08:31,980 --> 00:08:36,240 Rotational energy is then turned into electrical energy by 78 00:08:37,660 --> 00:08:41,280 electromagnetism the effect we have between electricity and magnetism. 79 00:08:41,280 --> 00:08:44,860 Again, as I said before now, the growth rate 80 00:08:45,240 --> 00:08:48,180 of wind farms at this moment in time is phenomenal. 81 00:08:49,200 --> 00:08:51,520 It is a massive, massive 82 00:08:51,520 --> 00:08:55,420 industry it is growing, especially where we belong in the East Coast. 83 00:08:55,580 --> 00:08:57,720 Grimsby, Hull. Absolutely massive. 84 00:08:58,160 --> 00:09:00,540 Even to the point where 85 00:09:01,080 --> 00:09:04,600 there are new buildings, new factories, ships 86 00:09:05,020 --> 00:09:08,260 to service them it's not just the wind turbines, 87 00:09:08,860 --> 00:09:11,740 it's the servicing of the wind turbines and all the other ancillary 88 00:09:12,360 --> 00:09:15,380 businesses that are needed to service it. 89 00:09:15,380 --> 00:09:20,760 So not only are we creating jobs, we're creating a good, strong economy, 90 00:09:21,260 --> 00:09:25,160 a good, strong system for people to come to our university, 91 00:09:25,360 --> 00:09:27,360 to our college, to your colleges. 92 00:09:27,720 --> 00:09:29,480 Learn about renewable technologies. 93 00:09:29,480 --> 00:09:31,820 It is a growth industry. It is somehwere we need to go.