TIDAL TURBINE CONFIGURATION ANALYSIS AT LARANTUKA STRAIT, EAST NUSA TENGGARA, INDONESIA

• Main Author: Seravina, Audrey
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/66981
• Institution: Institut Teknologi Bandung

Continuous use of fossil fuels has proven to have a significant impact on the climate. Indonesia has declared its commitment in achieving net-zero emissions by 2060 as an effort to reduce the effects of climate change. One of the strategies implemented is the transition to new and renewable energy, such as tidal stream energy. Research conducted shows that one of the strongest tidal currents is located at Larantuka Strait. This thesis aims to assess the resources available at Larantuka Strait using the Linear Momentum Actuator Disc Theory (LMADT) in a parallelsided tube and analyze the power generated for various tidal turbine configurations. The research is limited to the analysis of turbine configurations in a fence formation. The assessment is conducted in two ways: two-dimensional hydrodynamic modeling using TELEMAC2D and simplified as a one-dimensional model using the Runge-Kutta method. Based on the results for May 2022, the location has a maximum tidal current velocity of 2.67 m/s and an average velocity of 1.6 m/s. The thesis evaluates three types of commercial turbines: Tocardo T1, Tocardo T2, and SCHOTTEL HYDRO, using the one-dimensional model calculation with the Runge-Kutta method. The evaluation proves that the blockage ratio, an important parameter in this research, has an important effect on power production. As the blockage ratio increases, the power production initially increases, but then decreases approaching zero as the ratio advances to 1. This happens because the thrust asserted by the turbines gets stronger with the increase of blockage ratio, reducing the current velocity along the turbine, thus lowering the amount of power produced. Moreover, high values of thrust generated to create a need for a more resilient power extraction structure. Another important parameter in this theory is the turbine wake velocity coefficient ?4, which represents the ratio of the turbine flow velocity after it passes the turbines to the initial velocity. Calculations showed that for the model, the maximum power was achieved for ?4 = 0.33. Based on the research, the optimal blockage ratio for power extraction is 0.25, which results in 2 GWh of power in May 2022, or roughly 24 GWh per year