Environmental presentation
Transcript: Power take-off system: how the device transfers wave power to storable energy In surface-following attenuators, long, hinged floating tubes bob up and down in the water, parallel to the direction of the waves As the hinges flex, hydraulic fluid pumps generators What are two disadvantages of wave power? Sources: This is an example of an "oscillating wave surge converter" What are wave power stations classified by? Wave Power How it works: Pelamis - surface-following attenuator Wave energy is completely free! There is no fuel needed and no waste product. METHODS of energy capture include: What are two advantages to wave energy? Aquamarine Power's Oyster wave power http://www.darvill.clara.net/altenerg/wave.htm http://ocsenergy.anl.gov/guide/wave/index.cfm http://www.alternative-energy-news.info/technology/hydro/wave-power/ http://science.howstuffworks.com/environmental/earth/oceanography/wave-energy2.htm By Anri Brod & Helen Wieffering Generators are dependent upon the waves and the wind, which may vary. Needs a suitable site where waves are consistent. Wave generators must be able to withstand rough seas and winds Current technology can only capture about 50% of the energy produced. Impact on marine life is another concern. Some designs are very noisy - noise pollution could have a negative impact. Wave farms may interfere with commercial and recreational fishing Waves can produce A LOT of energy. ADVANTAGES Questions! Pelamis is an example of which type of energy capture? LOCATIONS for the devices include shoreline, nearshore, and offshore CETO - buoy EXAMPLES: Power stations are not expensive to operate or maintain. Overtopping devices have reservoirs which are filled with water by incoming waves to levels above the average surrounding ocean. This water is then released, and the energy of the falling water turns turbines. Point absorber/buoy Surface-floating attenuator Overtopping device Oscillating water column, etc. Disadvantages: In point absorbers and buoys, the buoys move relative to each other due to wave action, and this relative motion is used to drive electromechanical or hydraulic energy converters. In the case of CETO, underwater equipment on the sea bed has pistons, which are moved when waves pass across the top of the unit. This pumps seawater to drive generators on land. Name two things that affect wave power Wind transfers its energy onto waves as it blows over water Wave power is determined by height, wave speed, wavelength, and water density There are many, many, many different ways of collecting this power; because wave power is a largely unexplored method of alternative energy, there's no established "best" way to do it. Generally, these devices are classified based on three things: the method of energy capture, location, and their power take-off system
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