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All Journal CIVED (Journal of Civil Engineering and Vocational Education) Mechanical Engineering Education Journal Sainstek JURNAL PENDIDIKAN TAMBUSAI JOURNAL OF SCIENCE AND SOCIAL RESEARCH Eksakta : Berkala Ilmiah Bidang MIPA Jurnal Fokus Elektroda : Energi Listrik, Telekomunikasi, Komputer, Elektronika dan Kendali Journal of Applied Engineering and Technological Science (JAETS) MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Didaktik : Jurnal Ilmiah PGSD STKIP Subang Teknomekanik Fokus Elektroda: Energi Listrik, Telekomunikasi, Komputer, Elektronika dan Kendali) Jurnal Vokasi Mekanika MASALIQ: Jurnal Pendidikan dan Sains Fleksibel: Jurnal Pengabdian Kepada Masyarakat Journal of Engineering Researcher and Lecturer Journal of Innovative and Creativity IJIMCE : International Journal of Innovation in Mechanical Construction and Energy Journal of Civil Engineering and Vocational Education Mars: Jurnal Teknik Mesin, Industri, Elektro dan Ilmu Komputer
Yolli Fernanda
Universitas Negeri Padang
Religion Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Transportation Other

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Calculation of High Pressure Heater Efficiency in the Feedwater System of PT PLN IP Teluk Sirih Unit 2 Steam Power Plant Andre Kurniawan; Arwizet K; Yolli Fernanda; Zulvani Adha
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 1 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/v1frxb70

Abstract

PT PLN IP Teluk Sirih is a coal-fired steam power plant that supplies electricity to the West Sumatra region. In steam power plants, the High Pressure Heater (HPH) functions as a heat exchanger that preheats feedwater before entering the boiler by utilizing extraction steam from  turbine. Damage or performance degradation of the HPH can reduce its effectiveness and lifespan, decrease feedwater temperature, increase the required heating in  boiler, raise fuel consumption, and ultimately lower the overall efficiency of the power plant cycle. Therefore, this study aims to determine the efficiency of HPH at PT PLN IP Teluk Sirih Unit 2 in order to support proper maintenance planning and reduce operational costs. The research employs a quantitative method with a descriptive–analytical approach using actual operational data obtained from the Distributed Control System (DCS) of PLTU Teluk Sirih Unit 2. The efficiency of HPH is calculated by comparing the heat released by the steam  and the heat absorbed by the feedwater  or HPH 1 and HPH 2. The variables used include the feedwater inlet temperatures of 192.9 °C for HPH 1 and 141.5 °C for HPH 2. The results show that the efficiency of HPH 1 is 91.26%, while the efficiency of HPH 2 is 88.11%. For HPH 1,  and  are 49,552,500 kJ/h and 54,297,300 kJ/h, respectively, whereas for HPH 2,  and  are 71,613,300 kJ/h and 81,288,480 kJ/h. These results indicate that a higher inlet temperature leads to a greater ratio between  and  , and consequently to a higher HPH efficiency.  
Numerical Simulation of the Effect of Blade Shape on Vertical Axis Wind Turbine Using NACA 0015, NACA 4415, and NACA 7510 Randi Purnama Putra; Yolli Fernanda; Fitrah Qalbina; Alhakim, Rezki
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 1 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/8fw5gp43

Abstract

Energy is a resource that can be used to perform various tasks, including fuel, electricity, mechanical energy, and heat. With technological advances and global economic development, the demand for electricity will continue to increase. This drives various research efforts towards alternative energy sources, ranging from the development of existing tools to the creation of new innovations. Wind turbines work by utilizing the kinetic energy of the wind flow to rotate the blades, which are then converted into electrical energy through a generator system. The purpose of this study is to analyze the effect of curvature shape on the Lift Coefficient (Cl), Drag Coefficient (Cd), and Power Coefficient (Cp) of vertical axis wind turbine blades. Simulations were carried out in 3D using ANSYS Fluent software and the SST turbulence model, with wind speeds ranging from 4 to 7 m/s. The aerodynamic profiles analyzed were NACA 0015, NACA 4415, and NACA 7510. Aerodynamic simulations of vertical axis wind turbines were carried out using a steady-state approach with a multi-reference frame (MRF) rotation model to obtain the average aerodynamic characteristics of the rotor. The simulation results show that NACA 4415 produces the best Cl value with relatively controlled Cd, while NACA 0015 shows the worst aerodynamic performance. NACA 7510 produces the highest Cp value at all wind speed variations, despite low Cl and high Cd values, indicating that the drag mechanism dominates torque generation at low speeds.
ANALISIS KINERJA TURBIN AIR VERTIKAL TIPE S-SHAPE PADA SALURAN MELENGKUNG MENGGUNAKAN COMPUTATIONAL FLUID DYNAMICS (CFD) Asadellah, Dimas Pandhu; Qalbina, Fitrah; Fernanda, Yolli; Putra, Randi Purnama
JOURNAL OF SCIENCE AND SOCIAL RESEARCH Vol 9, No 1 (2026): February 2026
Publisher : Smart Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54314/jssr.v9i1.5793

Abstract

Abstract: The s-shaped turbine is a hydrokinetic turbine that has the potential to be applied to open channel flows due to its ability to operate at low flow velocities and its simple construction. However, the performance of this turbine is greatly influenced by the surrounding hydrodynamic conditions, including the geometry of the flow domain. This study aims to analyze the effect of variations in the open channel domain angle on the flow characteristics and performance of the s-shaped Savonius turbine using a Computational Fluid Dynamics (CFD) approach. Simulations were carried out at three variations of domain angles, namely 20°, 30°, and 40°, with an inlet flow velocity of 0.5 m/s, a turbine diameter of 76 mm, and a turbine height of 76 mm. The performance parameters analyzed included torque, power coefficient (Cp), and torque coefficient (Ct), as well as flow characteristics in the form of velocity contours, pressure contours, and streamlines. The simulation results show that variations in the domain angle have a significant effect on the flow distribution, pressure pattern, and torque stability produced by the turbine. The domain with an angle of 20° produces the highest Cp and Ct values, while the 30° domain shows a significant decrease in performance due to the increase in the recirculation zone and pressure imbalance around the rotor. Keyword: S-Shape Turbine; Hydrokinetics; Open Channel; CFD; Domain Angle Abstrak: Turbin tipe s-shape merupakan salah satu turbin hidrokinetik yang potensial untuk diaplikasikan pada aliran saluran terbuka karena kemampuannya beroperasi pada kecepatan aliran rendah dan konstruksinya yang sederhana. Namun, kinerja turbin ini sangat dipengaruhi oleh kondisi hidrodinamika di sekitarnya, termasuk geometri domain aliran. Penelitian ini bertujuan untuk menganalisis pengaruh variasi sudut domain saluran terbuka terhadap karakteristik aliran dan performa turbin s-shape menggunakan pendekatan Computational Fluid Dynamics (CFD). Simulasi dilakukan pada tiga variasi sudut domain, yaitu 20°, 30°, dan 40°, dengan kecepatan aliran masuk 0,5 m/s, diameter turbin 76 mm, dan tinggi turbin 76 mm. Parameter kinerja yang dianalisis meliputi torsi, koefisien daya (Cp), dan koefisien torsi (Ct), serta karakteristik aliran berupa kontur kecepatan, kontur tekanan, dan streamline. Hasil simulasi menunjukkan bahwa variasi sudut domain memberikan pengaruh signifikan terhadap distribusi aliran, pola tekanan, dan stabilitas torsi yang dihasilkan turbin. Domain dengan sudut 20° menghasilkan nilai Cp dan Ct tertinggi, sedangkan domain 30° menunjukkan penurunan kinerja yang cukup signifikan akibat meningkatnya zona resirkulasi dan ketidakseimbangan tekanan di sekitar rotor. Kata kunci: Turbin S-Shape; Hidrokinetik; Saluran Terbuka; CFD; Sudut Domain
Experimental study on the use of wood pellet briquettes in rocket stoves for household energy needs Irianto, Rafki; Fernanda, Yolli; Primawati, Primawati; Yuvenda, Dori
Journal of Engineering Researcher and Lecturer Vol. 5 No. 1 (2026): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v5i1.206

Abstract

This experimental study investigates the effect of air supply configurations on the combustion performance and thermal efficiency of wood pellet briquettes in rocket stoves for household energy use. With increasing global demand for energy and the depletion of fossil fuels, the shift to renewable biomass fuels, such as wood pellets, is essential to reduce carbon emissions and enhance energy efficiency. The study evaluates four airflow configurations: right fan only (F3), lower-left + right fans (F2+F3), two left fans (F1+F2), and all fans (F1+F2+F3). The results show that the F3 configuration achieved the fastest boiling time, highest boiling temperature, and lowest heat-loss temperature, indicating superior thermal performance. In contrast, configurations with higher airflow (F1+F2 and all fans) led to greater heat losses and slower boiling times, suggesting that excessive airflow can negatively affect efficiency. Additionally, the analysis of residual mass revealed that F3 and F2+F3 configurations produced the lowest residuals, indicating more complete combustion. This study provides important insights into optimising airflow configurations to improve the efficiency of biomass stoves. The findings offer practical implications for the design and operation of sustainable cooking technologies, promoting energy efficiency and reducing reliance on fossil fuels in households, particularly in rural areas.
ANALISIS NUMERIK KINERJA TURBIN ANGIN DARRIEUS TIPE H TERHADAP VARIASI JUMLAH BLADE DAN KECEPATAN ANGIN DENGAN PENDEKATAN SIMULASI CFD Diki Afrianto; Andre Kurniawan; Yolli Fernanda; Fitrah Qalbina
Didaktik : Jurnal Ilmiah PGSD STKIP Subang Vol. 11 No. 04 (2025): Volume 11 No. 04 Desember 2025 In Press
Publisher : STKIP Subang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36989/didaktik.v11i04.8776

Abstract

This study aims to analyze the aerodynamic performance of an H-type Darrieus wind turbine by varying the number of blades and wind speeds using the Computational Fluid Dynamics (CFD) method. The turbine geometry was modeled using SolidWorks 2022 and numerically simulated with ANSYS Fluent 2025. The models consist of three-blade and four-blade configurations employing the NACA 0012 airfoil profile, tested under three different freestream wind velocities: 7 m/s, 9 m/s, and 11 m/s. The simulations were conducted within static and rotating domains to examine the fluid flow characteristics around the rotor, including velocity distribution, pressure field, torque, and power efficiency. The results show that increasing wind speed leads to more complex and turbulent flow behavior, characterized by the emergence of vortex shedding behind the blades. The torque coefficient (Ct) and power coefficient (Cp) increased with higher wind speeds in the three-blade configuration, indicating greater energy conversion efficiency compared to the four-blade configuration. Conversely, the four-blade turbine exhibited reduced efficiency at higher wind speeds due to increased drag forces and inter-blade interactions, which caused energy losses. Overall, the findings demonstrate that the three-blade H-type Darrieus turbine provides superior aerodynamic efficiency and rotational stability at medium to high wind speeds, whereas the four-blade configuration performs better at lower wind speeds by generating higher starting torque. These results are expected to serve as a reference for the development of efficient vertical-axis wind turbine designs suitable for wind conditions in Indonesia.
ANALISIS PENGARUH VARIASI JUMLAH SUDU TERHADAP KINERJA TURBIN CROSSFLOW DI PT XYZ Farhan Rahmat Putra; Andre Kurniawan; Yolli Fernanda; Randi Purnama Putra
Didaktik : Jurnal Ilmiah PGSD STKIP Subang Vol. 11 No. 04 (2025): Volume 11 No. 04 Desember 2025 In Press
Publisher : STKIP Subang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36989/didaktik.v11i04.8777

Abstract

This study aims to analyze the effect of blade number variation on the performance of a crossflow turbine used in the Micro-Hydro Power Plant (PLTMH) system at PT XYZ. The research was conducted using a numerical simulation approach based on Computational Fluid Dynamics (CFD) with Solidworks 2022 for geometry modeling and ANSYS Fluent 2025 R1 for fluid flow simulation. The variations of blade numbers investigated were 18, 24, 30, and 32 blades, with constant operating parameters including a flow rate of 0.03678 m³/s, a head of 0.3 m, and a rotational speed of 1500 rpm. The simulation results indicate that the number of blades significantly affects the torque, output power, and efficiency of the crossflow turbine. The configuration with 18 blades produced the best performance, achieving a torque of 21.39 Nm, an effective power of 3359.64 W, and an efficiency of 31.09%, while configurations with 24 and 32 blades showed a significant decrease in efficiency to around 6%. The analysis of velocity contours, pressure contours, and streamlines revealed that the 18-blade configuration provides a more stable and focused flow with uniform pressure distribution along the blade’s leading edge, resulting in greater tangential force on the runner shaft. In contrast, increasing the number of blades causes higher turbulence and energy losses. Therefore, it can be concluded that the 18-blade configuration is the most optimal design for achieving efficient crossflow turbine performance under the specified operating conditions.
Co-Authors - Primawati A, Yufrizal Abdu Idham Adam Mandra Suwandi Agustian, Rizki Ahmed, Shabir Akbar, Arifki Akhmad Rais Al Rahman, Muhammad Fadil Albasyit, Muhammad Ravi Alhakim, Rezki Ambiyar, Ambiyar Aminuyati Ananda, Yoga Rizki Andika Putra ANDIKA SAPUTRA Andre Kurniawan Andre Kurniawan Andre Kurniawan Arafat, Andril Arwizet Arwizet Arwizet Arwizet, Arwizet Arwizet. K Asadellah, Dimas Pandhu Ashekul Islam Azis, Ismail Budi Syahri Delima Yanti Sari Desyandri Desyandri Devky Meinaldi Fernanda Diki Afrianto Dionova, Aldi Dori Yuvenda Dwi Sakti Putra DWI SURYANTO Egis Egis Eko Indrawan Elvira Zondra, Elvira Erizon, Nelvi Fadhilah Fadhilah Fadri, Muhammad Al Fahrendra, Aqsal Faisal, Afdal Farhan Rahmat Putra Fathi Aulia DZ Febri Prasetya Felia Maresta Fido Delfri Tamasya Firma Yulianis Fitrah Qalbina Fitri Amelia Fonny Maswija Priscilla Fretina Sari Hadi, Farhan Handayani, Meisuri Handrianto Handrianto Hendri Nurdin Hidayattullah, Riezky Irfan, Abdillah Irianto, Rafki Irzal Irzal Irzal, Irzal Jasman Jasman Kandena Putra, Tegar Kiwata, Takahiro Kurniawan, Badri La Ode Ahmad Barata M Chalid Kurnia M. Ilham Anugrah Illahi Mega Oktaviani Mochammad Haikal Muhammad Akhbar Muhammad Ihsan Muhammad Raihan Muhammad Riski Hidayat Muhammad Shiddiq Muhammad, Maghfiridhani Mulianti Nasution, Ridhollah Nelvi Erizon Nurdin Hendri Nurwijayanti Prasetya, Kresna Adi Pratomo, Muhammad Agung Primandari, Sri Riski Putri Primawati Primawati, Primawati Purwantono Purwantono purwantono purwantono Purwantono, Purwantono Putra, Randi Purnama Rahmadiawan, Dieter Ramadhan, Fadli Randi Purnama Putra Refdinal Refdinal, Refdinal Refdinal, Refdinal Refitra Irawan Remon Lapisa Ridhatul Arif Rifelino Rifelino Riki Saputra, Riki Riky Satria Rizki Ramadhan Nasution, Muhammad Robby, Muhammad Rudy Anarta Salmat, Salmat Seprianto, Ekon Sherly Rahmayani Shi, Shih-Chen Sri Rizki Putri Primandari Surya, Fajar Syahril Syahril Syaiful Salim Teki Haryono Toto Sugiarto Usin Usin Waskito Willy Vernando Yovindra, Difa Yufrizal Yufrizal Yuliardiansyah, Haris Yusmaita, Eka Zainal Abadi Zhuang, Wei-Ting Zulvani Adha