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Monday, 22 September 2014

MARINE energy

The ocean can produce two types of energy: thermal energy from the sun's heat, and mechanical energy from the tides and waves.

They cover 70 % of earth.

THERMAL ENERGY SYSTEMS
There are three types of electricity conversion systems: closed-cycle, open-cycle, and hybrid.

CLOSED CYCLE SYSTEMS:
Closed-cycle systems use the ocean's warm surface water to vaporize a working fluid, which has a low-boiling point, such as ammonia. The vapor expands and turns a turbine. The turbine then activates a generator to produce electricity.

OPEN CYCLE SYSTEMS:
Open-cycle systems actually boil the seawater by operating at low pressures. This produces steam that passes through a turbine/generator.

HYBRID SYSTEMS:
 And hybrid systems combine both closed-cycle and open-cycle systems.

MECHANICAl ENERGY SyStEMS
A  barrage (dam) is typically used to convert tidal energy into electricity by forcing the water through turbines, activating a generator. For wave energy conversion, there are three basic systems: channel systems that funnel the waves into reservoirs; float systems that drive hydraulic pumps; and oscillating water column systems that use the waves to compress air within a container. The mechanical power created from these systems either directly activates a generator or transfers to a working fluid, water, or air, which then drives a turbine/generator.

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