Luther Sule

Bio: Luther Sule is an academic researcher from Hasanuddin University. The author has contributed to research in topics: Water wheel & Water flow. The author has an hindex of 3, co-authored 15 publications receiving 31 citations.

Oscillating wave energy power generator for lift net fishing boat

Abstract: This paper compares several designs of an oscillating wave power generator suitable for local net fishing boat in the waters of Tonyaman in the Strait of Makassar, Indonesia. The designs were based on wave height data for the period of January to December 2016 and of the local fishing vessel construction data. Several generator designs were created to replace diesel engines used by the local fishermen to power their boats’ lamps in the night. Results showed that DESIGN 5 with Arm length to buoy ( L 1 ) of 4 m and Arm length to pulley ( L 2 ) of 3 m and DESIGN 6 with L 1 of 4 m and L 2 of 2 m were the two designs most fitting for that purpose. Both designs could produce sufficient power ( ) to power the boats’ lamps in the shortest wave height condition (0.75 m) and the tallest wave height condition (1.5 m). At the shortest wave height condition (0.75 m), DESIGN 5 produced 14,237.58 W and DESIGN 6 produced 14,290.31 W. At the tallest wave height condition (1.5 m), DESIGN 5 and DESIGN 6 generated 28,285.31 W and 28,496.25 W of power, respectively.

Analisis perilaku aliran terhadap kinerja roda air arus bawah untuk pembangkit listrik skala pikohidro

Abstract: Energy of water is one of the renewable energy that can be converted into electrical energy without pollution. Rotation, torque, and power generated by the water wheel can be used directly both for irrigation pumping and for running a rice mill even move the alternator and electrical generators. The purpose of this study was to find the best water wheel performance indicated by torque, rotation, and power as well as the relative speed of the water at the side of the blade. The results obtained in the preliminary test were the average water velocity of 2.50 m/s, the average rotation shaft of 79.78 rpm, the average torque on the shaft of 58.98 Nm, the average power of 510,67 W. The second results were also obtained as given the results and discussion section. It was found that the best water wheel performance based on the analysis was shown in the second test results.

Numerical investigation of modified savonius wind turbine with various straight blade angle

Abstract: The present paper aims to numerically investigate the two-dimensional flow analysis of modified Savonius wind turbine using computational fluid dynamics. The effects of the straight blade angle on the turbine performance were studied. Simulations based on the RANS equations and the SST-k-w turbulence model are used to simulate the airflow over the turbine blades. Both the static and dynamic simulations were performed. In the static simulation, the drag and lift coefficient on the Savonius turbine were directly calculated at every angular position, and the time-averaged moment and power coefficients were computed in each of the dynamic simulations. From the results, it can be concluded that the turbine with a straight blade angle of 100° model gives the better performance at higher Tip Sped Ratio (TSR) than other models.

Effect of Blades Number on Undershot Waterwheel Performance with Variable Inlet Velocity

Abstract: The undershot waterwheel is recommended to increase electrification ratio in remote areas of Indonesia due to its simple shape, which results in higher efficiency under low head conditions than other turbines. Using analytic and numerical methods, this study develops an equation to determine how many blades should be used and examines the effects of the kinetic energy of water on the energy conversion process to determine how the undershot waterwheel should be classified. Analytical methods were used to develop an equation to determine blades number, and numerical methods were used to verify the new equation. Variable inlet velocities of 1 m/s, 3 m/s, and 5 m/s and variations in blades number of 6, 7, 8, 9, and 10 blades were tested. From the analytical results, the recommended blades number is 8. Based on the numerical results, an 8-bladed waterwheel is most efficient with variable inlet velocities of 1 m/s (45.58% efficiency) and 5 m/s (13.84% efficiency). Analyzing the data using two-factor analysis of variance (ANOVA) without replication, it was determined that blades number effects output power, but inlet velocity does not. Thus, the proposed equation for determining the ideal blades number can be effectively used, but it still needs validation through experimentation. Furthermore, the kinetic energy of water was not found to have an effect on the energy conversion process in an undershot waterwheel, therefore, the undershot waterwheel should be classified as a reaction turbine.

Study of PLTMH development planning in sasnek village sawiat district, South Sorong Regency West Papua Province

Abstract: Electricity is needed by the whole society. Sasnek village is one of the villages located in Sawiat District, South Sorong Regency, West Papua Province. Sasnek village is very clear and inhabited around 100KK. This village has not been served by electricity until now. Micro-hydro power plants are small-scale power plants whose capacity presents between 100 W to 100 kW. This study will be used for loading stages with a 12 Volt DC power capacity, because it is one of the most efficient, young and safe ways. Measurement of air discharge, discharged by 2 liters / second from a measurement area of 5 m2 and an average air speed of 00.65 m / d. However, due to the condition of the river water flowing throughout the year in the sense of never dried, then used a correction factor of 0.75. Thus the flow that can be used is equal to 0.65 m3 / d. Based on the analysis of the potential contained in Sasnek PLTMH, it can be calculated Distribution Grid sourced from Sasnek PLTMH is 10 KW.With the careful planning so that the results of its implementation will give a positive impact to be meeting the needs of electricity in the village and surrounding villages sasnek.

A Novel Hydro Powered Online Power Converter for Marine Lighting Applications

Abstract: This paper presents a new hydro energy based dc-dc PFC sepic based buck converter for marine lighting applications. The major advantage of the proposed power converter is high power factor and low THD with higher efficiency. SEPIC converter produces continuous smooth ripple free current because of two inductors in series in line in its circuit. Sepic converter produces lower switching losses because of lower voltage stress on power switch employed compared to other buck-boost converter topologies. Tidal wave energy is converted into mechanical energy with the help of a hydro turbine which drives a permanent magnet synchronous generator to produce three phase ac output voltage. It produces a low ac voltage which is converted into DC using passive diode rectifier and fed to sepic converter for voltage regulation as well as to improve quality of power supply such as high power factor, low THD. The proposed sepic based power converter for marine lighting application is simulated in MATLAB/Simulink environment for verifying the performance of proposed scheme.