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OceanSolns

# OceanSolns - Design of Alternative Energy Systems Ocean...

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1 ME 417 Design of Alternative Energy Systems Ocean Energy Problem Solutions 1. It is proposed to build an OTEC system on Lake Superior where the summer time surface temperature is 64 ° F and the deep water temperature is 6 ° C. Determine the minimum amount of surface water that must be used if this system is produce 800 kW for an allowable water temperature change of 5 ° C. Solution: We begin by converting our temperatures to K. T H = (64+460)/1.8 = 291 K T L = 5+273 = 278 K Our Carnot cycle efficiency is then given by 0.0447 291 278 - 1 T T 1 H L max = = - = η Our minimum flow rate of surface water required is kg/s 852.7 ) 5 )( 2 . 4 )( 0447 . 0 ( 800 ) T ( c W m H H , p max OTEC H = = Δ η = ° ° 2. A current energy power system is proposed for a location where the average current speed is 0.75 m/s. Two marine turbines power are being considered for the system, which have the following conditions Turbine Efficiency Rotor Diameter Capital Cost Rhino 35% 45 m \$15M Bruin 31% 52 m \$12.5M Determine the energy cost (\$/kWh) for each turbine and make an implementation recommendation. You may take an interest rate of 13% and a

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OceanSolns - Design of Alternative Energy Systems Ocean...

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