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Ocean Thermal Energy Conversion Energy From the Sea Dr Peter Ridd Physics Department James Cook University. Alternative Energy. Solar Power Wind Power Wave Power Tidal Power Bio-fuels Nuclear Energy OTEC. Heat Engines. Petrol Engines Diesel Engines Steam Engines

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## Alternative Energy

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**Ocean Thermal Energy ConversionEnergy From the SeaDr Peter**RiddPhysics Department James Cook University**Alternative Energy**• Solar Power • Wind Power • Wave Power • Tidal Power • Bio-fuels • Nuclear Energy • OTEC**Heat Engines**• Petrol Engines • Diesel Engines • Steam Engines • Gas Turbines (e.g. jet engines)**All heat engines have a hot end and a cold end**• Gas is heated (Hot end) and allowed to expand. • Expanding gases cool • Much of the heat in the gas is wasted in the exhaust gas (cold end)**Rankine Cycle**Heating Required HOT WATER Cooling required COLD WATER**Surface Seawater around 25 degrees**• Bottom seawater around 4 degrees Coral Sea**1000 m**Cairns Townsville**Problem**• As the temperature difference between the hot end and cold end gets smaller, the efficiency decreases • Diesel engine DT =500 degrees • OTEC DT =20 degrees • Diesel Engine Efficiency is about 25% • OTEC Efficiency is at most 7%**Other Problems**• Submarine Cable • Moorings • Extreme environment (Salt Water)**Consider 1000 MWatt plant**• Assume 3% efficiency • Require 1000 cubic meters/sec flow rate • Pipe of radius of 10 m with flow rate of 3 m/s • Approximately the same flow rate as the Tully River in moderate flood • Energy loss is relatively small as pumping head is equivalent about 6 m. Perhaps 60 MW**Waste Water Plume**• High in Nutrients (orders of magnitude higher than shelf water) • Plume must be discharged on slope below thermocline

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