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Power of the Tide - Harnessing the Moon
By Scott HarkerRenewable Energies generally come from two sources: Sunlight and Gravity.
From SUNLIGHT we get:
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Solar Energy which uses direct sunlight,
- Wind Power which harness temperature differences in the atmosphere created by the warmth of the Sun.
- Biomass which converts plant and animal products into heat to produce electricty and fuels such as biodeisel. Of course, plants grow by changing sunlight into sugar and the animal chain starts with eating plants.
Hydro-Electric Power which takes advantage of
the movement of water in rivers. And rivers, of course, are freshwater
pulled by the Earth's gravity field which flows "downward" from the
mountains to the oceans. There is also a solar component to hydro-electric
energy, since rainwater, the source of water on land, is
recycled through the atmosphere by changes in temperature caused by
sunlight.- Tide Power which uses the cyclic rising and falling of Ocean Waters to turn turbines and produce electricity. All coastal areas consistently experience two high and two low tides over a period of slightly greater than 24 hours.
What are Tides?
Tides are created by the dynamic interactions of the Moon's gravity field with the oceans of the Earth. As our planet rotates each day, the moon pulls on the surface of the Earth, the exact spot where the force is exerted changes constantly as our world turns. Landmasses do not change much when touched by the Moon's gravity, but the Oceans are greatly affected by the tug of gravity. Bulges are created in the oceans, raising and lowering the level of Ocean waters as the "bulge" moves along with the rotation of the Earth. Additional variations of the Tides are created during a month due to the differences in the Moon's positional relationship with the Earth, as the Moon goes through its monthly orbit.Tide Power - Harnessing the Moon - Tapping the Tide:
Tidal power technologies include the following:
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Barrage or dam
A barrage or dam is typically used to convert tidal energy into electricity by forcing the water through turbines, activating a generator. Gates and turbines are installed along the dam. When the tides produce an adequate difference in the level of the water on opposite sides of the dam, the gates are opened. The water then flows through the turbines. The turbines turn an electric generator to produce electricity.
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Tidal fence
Tidal fences look like giant turnstiles. They can reach across channels between small islands or across straits between the mainland and an island. The turnstiles spin via tidal currents typical of coastal waters. Some of these currents run at 5–8 knots (5.6–9 miles per hour) and generate as much energy as winds of much higher velocity. Because seawater has a much higher density than air, ocean currents carry significantly more energy than air currents (wind).
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Tidal turbine
Tidal turbines look like wind turbines. They are arrayed underwater in rows, as in some wind farms. The turbines function best where coastal currents run at between 3.6 and 4.9 knots (4 and 5.5 mph). In currents of that speed, a 15-meter (49.2-feet) diameter tidal turbine can generate as much energy as a 60-meter (197-feet) diameter wind turbine. Ideal locations for tidal turbine farms are close to shore in water depths of 20–30 meters (65.5–98.5 feet).
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Present and Future Use of Tide Power from the Moon
Scott Harker is the publisher of several websites including: Sherlock Holmes Pastiches, Aikido | Japanese Martial Arts, Great Food | Great Recipes, Dieting Help | Move More - Eat Less, Natural Healing and Aromatherapy
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