04: An Ocean Thermal Energy Converter (OTEC) pumps 200 m/s through a heat exchanger in which the temperature (expre...
04: An Ocean Thermal Energy Converter (OTEC) pumps 200 m/s through a heat exchanger in which the temperature (expressed in Kelvins) drops by 1 %. All the heat extracted is delivered to the ammonia boiler. The ammonia temperature, THT, at the turbine inlet is equal to the mea temperature of the water in the warm water heat exchanger minus 1 K. The temperature, Tcr, of the ammonia leaving the turbine is kept at 10°C by the cooling effect of 250 m/s of cold water. The efficiency of the turbine/generator system is 90% of the Carnot efficiency of a heat engine working between THT and TcT 12 MW of the produced electricity is used for pumping. Heat capacity of water is 4.2 MJ m K (i) What must the intake temperature of the warm water be, so that a total of 20 MW of electricity is available for sale? (ii) What must the intake temperature be so that the OTEC produces exactly equal to the amount of power needed for pumping? Q5: Comment on two tidal energy electricity-generation systems
04: An Ocean Thermal Energy Converter (OTEC) pumps 200 m/s through a heat exchanger in which the temperature (expressed in Kelvins) drops by 1 %. All the heat extracted is delivered to the ammonia boiler. The ammonia temperature, THT, at the turbine inlet is equal to the mea temperature of the water in the warm water heat exchanger minus 1 K. The temperature, Tcr, of the ammonia leaving the turbine is kept at 10°C by the cooling effect of 250 m/s of cold water. The efficiency of the turbine/generator system is 90% of the Carnot efficiency of a heat engine working between THT and TcT 12 MW of the produced electricity is used for pumping. Heat capacity of water is 4.2 MJ m K (i) What must the intake temperature of the warm water be, so that a total of 20 MW of electricity is available for sale? (ii) What must the intake temperature be so that the OTEC produces exactly equal to the amount of power needed for pumping? Q5: Comment on two tidal energy electricity-generation systems