Kumpulan Jurnal dan Prosiding Elektronik PPNS (Politeknik Perkapalan Negeri Surabaya - Pusat Penelitian dan Pengabdian Masyarakat, P3M)
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Pengaruh Variasi Penambahan Sudu +4 cm Dan Sudut Deflektor 15° Di Samping Advancing Blade Kecepatan 7 m/s Turbin Angin Savonius Myring n=1
No full textThe Savonius wind turbine indeed has several shortcomings, and research to improve its performance is very important. In the study mentioned, the use of the Myring equation with n=1 shows potential for enhancing turbine efficiency. Further research with variations in arc length and deflector angles next to the advancing blade is a good step to explore the potential for performance improvement. From the experimental results provided, it appears that a deflector angle of 15° at a wind speed 7 m/s yields the best performance. The obtained values for the Coefficient of Power (Cp) is 0,2662 and Coefficient of Torque (Ct) is 0,6970. The increase in Coefficient of Power (Cp) by 60.166% and Coefficient of Torque (Ct) 7.930% compered to the savonius wind turbine with Myring n=1 without any deflecto
Studi Pengaruh Sudut Serang terhadap Kinerja Wells Turbine sebagai Wave Energy Convertr pada Oscillating Water Column
No full textOscillating Water Column is a method for converting ocean wave energy into electrical energy. The mechanism of how the oscillating water column works is through the rise and fall of ocean waves, which push air into the oscillating water column, thereby rotating the turbine connected to the generator to produce an electrical current. Wave height and wave period are some of the factors influencing the power output of oscillating water column-type tidal power plants. Research was conducted to analyze turbine performance, specifically the effect of turbine angle of attack on the Coefficient of Torque (CT) and Coefficient of Power (CP) values. The angle of attack configuration of 12° and tip speed ratio of 2 produce the highest performance, marked by a maximum Coefficient of Torque (CT) value of 0,361 and Coefficient of Power (CP) value of 0,793
ANALISIS PENGARUH BEBAN KERJA DAN MOTIVASI TERHADAP PRODUKTIVITAS PADA DEPARTEMEN GALANGAN KAPAL
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This study analyzes the effect of workload and motivation on work productivity in one of the shipyard departments in Surabaya. The problem stems from project delays and high overtime hours, which indicate an imbalance in workload distribution and potentially low employee motivation. A quantitative causal study using multiple linear regression analysis was employed, and data were collected through questionnaires distributed to 36 employees using a saturated sampling technique. The results indicate that workload and motivation have a positive and significant effect on work productivity. Theoretically, this study contributes to strengthening the empirical evidence of the relationship between workload, motivation, and productivity. From a managerial perspective, the findings suggest that balanced workload distribution and improved employee motivation can help management reduce project delays and minimize overtime hours
ANALISIS KEPUASAN PENGGUNA APLIKASI MOBILE TICKETING DENGAN MODEL TAM DAN EUCS PADA PERUSAHAAN PELAYARAN
Full text linkThis study aims to analyze user satisfaction with the mobile ticketing application of a shipping company by applying the Technology Acceptance Model (TAM) and the End User Computing Satisfaction (EUCS) framework. The TAM model includes Perceived Ease of Use, Perceived Usefulness, Attitude Toward Using, Behavioral Intention to Use, and Actual Usage, while the EUCS model consists of Content, Accuracy, Format, Timeliness, and Ease of Use. A quantitative approach was employed by distributing questionnaires to application users, and the data were analyzed using Structural Equation Modeling (SEM) with SmartPLS 4.0. The results reveal that all variables in TAM and EUCS significantly affect user satisfaction. Perceived Ease of Use emerged as the most dominant factor within TAM, while Ease of Use was the strongest determinant in the EUCS model. Overall, EUCS achieved an R² value of 71%, indicating that most of the variance in user satisfaction is explained by EUCS variables. These findings highlight the importance of ease of use, information accuracy, and interface quality in enhancing user satisfaction with digital ticketing services. The study recommends that the company improve the seat selection feature, enhance interface design, optimize system performance, and provide more accurate schedule information to strengthen user satisfaction and loyalty in the future
KAJIAN NUMERIK PENGARUH VARIASI PANJANG BUSUR TERHADAP PERFORMA TURBIN ANGIN SAVONIUS PERSAMAAN MYRING n=1 PADA KECEPATAN 6 m/s
No full textThis study aims to analyze the performance of Savonius Myring n=1 wind turbine with arc length variation using Computational Fluid Dynamics (CFD) method. The focus of the research includes obtaining the values of Coefficient of Torque (CT), Coefficient of Power (CP), as well as visualizing the flow and pressure distribution on the turbine. Geometry variations were carried out by adding and reducing the arc length by 4 cm, and testing was carried out under three wind speed conditions, namely 5 m/s, 6 m/s, and 7 m/s. The analyzed turbine dimensions have a height of 40 cm and a diameter of 40 cm. The simulation results show that the best configuration is obtained in the variation of the arc length addition of 4 cm with a wind speed of 6 m/s, which results in a CT value of 0.1916 and CP of 0.1916. The use of Myring n=1 and arc length variation are proven to contribute to the increase of turbine aerodynamic efficiency
Studi Numerik Pengaruh Sudut Deflector di samping Advancing Blade terhadap Performa Turbin Angin Savonius dengan Myring n = 1
No full textIn the previous experiment, the research of Savonius Wind Turbine with myring n = 1 has been conducted by varying deflector angles. The result showed that additional deflector next to advancing blade could improve the turbine performance. However, the experiment did not produce visualisation of streamline, velocity and pressure contours around the turbine. This visualization is important to know more about the turbine performance result in detail. Based on the above condition, this study was conducted by using Computational Fluid Dynamics (CFD) method as a complement to the experimental data. The simulated turbine has a diameter ratio (ds/D) of 0.4. It used deflector variations next to the advancing blade with angles of 15o, 30o, 45o. The wind speed was 7 m/s. With CFD, the visualisation of the airflow around the turbine can be analyzed and clearly seen. It showed that the deflector could increase the Coefficient of Torque (Ct) and Coefficient of Power (Cp) values. The best performance was achieved at a deflector angle of 15° with maximum Ct at TSR 0.4 and Cp at TSR 0.8, while the Cp value increased by 25.128%, and the Ct value increased by 3.10%
DESAIN DAN FABRIKASI SISTEM PEMBANGKIT TENAGA PADA SIKLUS ORGANIC RANKINE CYCLE (ORC) UNTUK PROTOTIPE OCEAN THERMAL ENERGY CONVERSION (OTEC)
No full textThe OCEAN THERMAL ENERGY CONVERSION (OTEC) system utilizes the temperature difference between warm surface seawater and cold deep seawater to generate energy. This study develops a laboratory-scale OTEC prototype based on the Organic Rankine Cycle (ORC), designed to operate under low-temperature differences. The main focus of this research is the use of a Finned Tube Heat Exchanger as the evaporator to enhance heat absorption efficiency, as well as the utilization of a modified rotary-type compressor functioning as a turbine to extract energy from the working fluid. Refrigerant R22 is used due to its low boiling point, stable thermodynamic characteristics, and suitable operating pressure for lowtemperature ORC systems. The system is designed to operate as a closed ORC cycle with key components including the evaporator, turbine, condenser, and refrigerant pump. Based on the calculation results, the turbine produces 0,04187 kW of power with an isentropic efficiency of 65%. On the evaporator side, the UA value is calculated at 220 W/K, with a fin surface area of approximately 0,01071 m², and a fin efficiency of 1. Initial testing results show that the system can operate stably with baseline performance appropriate for laboratory simulation. This prototype design is expected to serve as a foundation for further experimental development of more practical and economical low-temperature energy conversion systems
ANALISIS PERFORMA FOUR STROKE DIESEL ENGINE MENGGUNAKAN XPOWER XP16000G DENGAN BAHAN BAKAR MULTI-FEEDSTOCK BIODIESEL (MINYAK KELAPA SAWIT, MINYAK JELANTAH, MINYAK KEDELAI)
No full textThis study discusses the performance of four-stroke diesel engines using multi-feedstock biodiesel fuels based on palm oil, used cooking oil, and soybean oil. Tests were conducted with various fuel blends (B35, B40, B100) and the addition of the Xpower XP 16000G fuel quality enhancer. The main objective was to determine the effect of these combinations on power, torque, specific fuel consumption (BSFC), and mean effective pressure (BMEP) at various RPM and load levels. The test results showed that convection biodiesel using the Xpower XP 16000G auxiliary provided the most optimal overall performance. The auxiliary significantly improved efficiency, with all fuel variations from having the lowest performance to having more efficiency, especially in the convection biodiesel fuel variation with XPower XP16000G. This research supports the application of biodiesel blends as a more efficient and environmentally friendly alternative fuel for diesel engines
Modelling Analisis Pengaruh Laju Aliran Hidrogen dan Oksigen Terhadap Unjuk Kerja Proton Exchange Membrane Fuel Cell (PEMFC)
No full textThe increasing global demand for fossil fuels, which are depleting, calls for alternative energy sources with efficient and environmentally friendly technologies such as Proton Exchange Membrane Fuel Cell (PEMFC). This research aims to model and analyze the effect of hydrogen and oxygen flow rates on the performance of PEMFC using Computational Fluid Dynamics (CFD) simulation. The flow rates were varied between 0.5, 1, 1.5, and 2.5 L/min for both hydrogen and oxygen. The simulation results show the output power for each combination, allowing identification of the optimum flow rates for maximum power output. Validation with previous studies resulted in an acceptable error margin of 0.74%, confirming the model accuracy. The results demonstrate that increasing the flow rate generally increases the fuel cell’s output power until reaching an optimum point
EXPERIMENTAL STUDY OF THE EFFECT OF RPM VARIATION ON THE PERFORMANCE OF AN AXIAL FAN WITH 8 BLADES
No full textThis study aims to evaluate the performance of a direct-drive axial fan by observing the effect of rotational speed (RPM) variations on velocity, static pressure, airflow rate, and power coefficient. Data collection was carried out experimentally with RPM variations of 1330, 1280, 1230, and 1180, as well as by closing the outlet section at three levels of blockage: 30%, 60%, and 100%. Air velocity was measured using an anemometer, RPM was measured using a tachometer, and pressure was measured using a manometer.The results show that at 1330 RPM, the air velocity reached 20.82 m/s, the airflow rate was 3.19 m³/s, the pressure was 247 Pa, and the power coefficient was 6.557. At 1280 RPM, the air velocity was 18.90 m/s, the airflow rate was 2.90 m³/s, the pressure was 220 Pa, and the power coefficient was 5.702. At 1230 RPM, the air velocity was 13.47 m/s, the airflow rate was 2.07 m³/s, the pressure was 207 Pa, and the power coefficient was 5.615. At 1180 RPM, the air velocity was 13.46 m/s, the airflow rate was 2.06 m³/s, the pressure was 187 Pa, and the power coefficient was 4.497