For the in-stream generator , a supported beam structure will be constructed spanning the lagoon mouth and the turbines suspended from it (refer to image). a) A 5 m diameter rotor turbine is being considered, what would be the total power available if the tidal current has an average velocity of 1 m/s? (b) 300 m width of the channel by the mouth is deep enough to accommodate the turbines, ensuring that they will be fully submerged. Assuming the turbines are spaced one rotor diameter apart, how many turbines can be deployed and what is the total capacity of the site? (c) Assuming a wave-to-wire efficiency of 30% and capacity factor of 30% due to the turbines’ adjustable blades enabling them to generate during ebb & flood, determine the total energy generated per year and income generated at $10 per kWh. If the project costs $10million, what will be the payback period?

 

Depth (m) 0.00- -2.00- -4.00- -6.00- -8.00- -10.00+ 0.00 0.20 5A 16.70 16.60 0.40 0.60 0.80 1.00 1.20 1.40 Distance from the westem side of the lagoon (km) II 17.30- 1.60 1.80