Design and Simulation of Axial Turbine for Ocean Thermal Energy Conversion (OTEC)

Aldara, Desta Rifky (2018) Design and Simulation of Axial Turbine for Ocean Thermal Energy Conversion (OTEC). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Indonesia menghadapi penurunan cadangan energi fosil sekitar 3% setiap tahun (Dewan Energi Nasional, 2015), dan belum diimbangi dengan penemuan cadangan energi baru. Oleh karena itu, perlu untuk meningkatkan penggunaan Energi terbarukan untuk memenuhi kebutuhan energi. Energi terbarukan adalah energi yang berasal dari proses alam berkelanjutan. Indonesia terletak di daerah tropis, memiliki banyak potensi energi laut. OTEC (Ocean Thermal Energy Conversion) adalah salah satu dari banyak sumber energi terbarukan dari lautan. OTEC atau Ocean Thermal Energy Conversion adalah salah satu teknologi terbaru yang menggunakan perbedaan suhu antara air laut dalam dan dangkal. Sistem OTEC umumnya menggunakan amonia (NH3) sebagai fluida kerja. Amonia digunakan karena memiliki titik didih yang relatif rendah dibandingkan dengan air. Sistem OTEC terdiri dari evaporator, turbin, generator, kondensor, dan pompa. Dalam penelitian ini, penulis memfokuskan pada desain turbin OTEC skala laboratorium. 13 model turbin dirancang dan dibandingkan untuk mendapatkan efisiensi dan daya bersih tertinggi. Metode CFD digunakan dalam desain dan simulasi. Berdasarkan hasil simulasi, perhitungan dilakukan untuk mengetahui debit air laut hangat dan dingin, daya pompa, dan daya bersih sistem OTEC. Efisiensi tertinggi dan daya bersih adalah turbin 3 stage 40 derajat dengan 350,91 kW daya yang dihasilkan, dan efisiensi 65,02%. Terendah adalah turbin satu tahap dengan daya nett 30,87 kW, dan efisiensi 45,85%. ========================================================================================================= Indonesia faces a decreasing in fossil energy reserves about 3% every year and has not been matched by the discovery of new energy reserves. Therefore, it is necessary to increase the use of renewable Energy to meet energy needs. Renewable energy is energy derived from sustainable natural processes. Indonesia located in the tropical area, it has a lot of potential ocean energy. OTEC (Ocean Thermal Energy Conversion) is one of many renewable energy sources from the ocean. OTEC or Ocean Thermal Energy Conversion is one of the latest technologies that used the temperature difference between deep and shallow seawater. OTEC system generally used ammonia (NH3) as working fluid. Ammonia is used because it has a relatively low boiling point compared to water. OTEC system consists of evaporators, turbines, generators, condensers, and pumps. In this research, the authors focused on the design of lab-scale OTEC turbines. 2 stage turbine will be varied the tilt which is 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 degree. The computational fluid dynamics (CFD) method is used in this research to simulate the OTEC Turbine. Based on the simulation results, the highest efficiency and net power is a 2 stage 40 degree turbine with 57.45% of efficiency and 287.25 kW of generated power. Keywords— Indonesia, ocean, renewable energy, turbine, ocean thermal, OTEC, CFD

Item Type: Thesis (Undergraduate)
Additional Information: RSSP 621.43 Ald d-1 3100018077997
Uncontrolled Keywords: marine, renewable energy, turbine, ocean thermal, OTEC, CFD
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ266 Turbines. Turbomachines (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1010 Electric power system stability. Electric filters, Passive.
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK1073 Ocean thermal energy conversion
Divisions: Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User: Desta Rifky Aldara
Date Deposited: 14 Oct 2020 02:11
Last Modified: 14 Oct 2020 02:11
URI: https://repository.its.ac.id/id/eprint/55499

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