Based on the characteristic of Kuroshio passing through Green Island, Taiwan, a new type of submerged duct was designed to capture the maximal power of the marine current. The inclusion of nozzle and diffuser in a shrouded duct is frequently used to accelerate, decelerate, or affect flows in a desirable manner. In this study, a shrouded nozzle-diffuser horizontal turbine was designed. Five geometric parameters are determined to have an optimal power take off (PTO) from the ocean current. The parameters needed to be determined are inlet and outlet diameters, the lengths of the nozzle and diffuser and the gap between blade tips and the inner wall of the duct.

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