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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 Tsaqofah: Jurnal Penelitian Guru Indonesia 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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Studi Eksperimental Penggunaan Solar Collector dalam Pengeringan Ikan Menggunakan Media Pasir Muhammad Fadil Al Rahman; Yolli Fernanda; Primawati Primawati; Andre Kurniawan
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 1 (2025): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i1.802

Abstract

Fish drying using a solar collector with heat storage is hot air taken directly from solar energy channeled into the solar collector which can store heat energy from the sun with sand media in the solar collector. The research method involves drying fish at different temperature and time variations, and comparing the results with conventional drying methods. The parameters measured include the moisture content and the dried fish produced. In addition, the dried fish produced from this process had better texture and flavor, thus improving the quality of the final product. The purpose of this research is to dry fish using a solar collector by using solar energy media to absorb heat energy. The test results of the fish dryer using sand media showed the highest temperature on the inside of the oven with a temperature of 41 ° C at 11:00 WIB with a solar intensity of 499 W/m². Drying on fish occurs a reduction in fish content, namely 49.25% to 64.70% for 8 hours of drying using a solar collector. The drying rate of the fish drying process is 0.091 g/min to 0.061 g/min with a collector efficiency level of 15.04% on the first day of testing and 16.52% on the second day of testing. In the process of drying fish for two days, there is a reduction in fish mass from 67 grams to 12 grams with a mass reduction of about 55 grams.
Analisa Alat Pengering Ikan Solar Kolektor Dengan Media Penyimpan Panas Batu Spli Afdal Faisal; Yolli Fernanda; Arwizet K; Primawati Primawati
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 1 (2025): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i1.807

Abstract

The use of solar energy as an alternative energy source has developed significantly in various applications. The fish dryer in this study utilizes solar energy, assisted by a solar collector, which uses split stones as a heat storage medium. The aim of this research is to enhance the usage of the solar collector fish dryer because it can be used when there is insufficient solar energy. The research method includes the design and creation of a dryer prototype, as well as measuring the temperature of incoming and outgoing air, including the relative humidity inside the drying chamber. The results revealed that utilizing split stones as a heat storage medium can maintain the air temperature in the drying chamber at an optimal level for a longer period, even with varying sunlight intensity. This research was conducted at the Mechanical Engineering Laboratory of Universitas Negeri Padang. The highest temperature achieved in the solar collector fish dryer with a heat storage medium in the oven or drying chamber was 40°C at 13:00 WIB, with a solar intensity of 503 W/m². The drying process of salted fish using split stones as a heat storage medium resulted in a moisture evaporation rate of 49.25% - 64.7% over 8 hours, with a drying rate of 0.068 g/m - 0.079 g/m. The collector's efficiency was 16.6% on the first day and 16.48% on the second day of testing.
Analisa Penggunaan Bahan Bakar Pellet Kayu pada Tungku Biomassa Rizki Agustian; Yolli Fernanda; Arwizet K; Andre Kurniawan
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 1 (2025): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i1.827

Abstract

Along with population growth and global industrialization, the level of fossil fuel use continues to increase. If fuel consumption continues to increase without proper maintenance, the fuel oil (BBM) crisis will become an unavoidable problem. Utilizing biomass as a source of energy is profitable because theoretically it does not produce the greenhouse gas CO2 which is detrimental to the environment. However, conventional biomass stoves still face problems related to exhaust emissions and combustion efficiency. This study's objective is to make a biomass stove that can reduce exhaust emissions to increase combustion efficiency, thus supporting the use of environmentally friendly energy. The method usually used is by changing the mass of wood pellets during boiling water into the combustion chamber. The weight ranges between 300 grams, 400 grams, 500 grams, 600 grams and 1400 grams, each according to the capacity of the combustion chamber. The five types of tests aim to determine the extent to which differences in wood pellet mass and biomass stove type have on the combustion process, as well as how long the process takes. The findings of the study show that variations in the mass of wood pellets greatly influence the boiling time of water, with a mass of 300 grams the boiling time has not yet reached the boiling point of the water, with a mass of 400 grams it gets 23 minutes, with a mass of 500 grams it gets 25 minutes, with a mass 600 grams can be obtained in 26 minutes
Analisis Penambahan Turbin Magnus pada Kapal Tanker 1700 DWT Menggunakan Simulasi Computational Fluid Dynamics Fajar Surya; Randi Purnama Putra; Yolli Fernanda; Fitrah Qalbina
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 4 (2025): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i4.901

Abstract

Turbin magnus merupakan turbin yang berfungsi sebagai sistem propulsi tambahan pada kapal dengan tujuan meningkatkan efisiensi energi dan mengurangi emisi gas buang. Tujuan penelitian ini adalah untuk menganalisis perbandingan performa turbin magnus tipe flettner rotor dan thom rotor terhadap koefisien lift (C?), koefisien drag (Cd), gaya thrust (Fr), serta hambatan total baru kapal (RT New). Metode penelitian menggunakan simulasi berbasis Computational Fluid Dynamics (CFD) dengan menggunakan software Ansys Fluent 2025 R1 Student Version. Hasil penelitian menunjukkan bahwa turbin magnus tipe thom rotor memiliki nilai C? lebih tinggi sebesar 0,3364; 0,3276; 0,3157 pada kecepatan 5 m/s, 10 m/s, dan 15 m/s dibandingkan flettner rotor sebesar 0,2785; 0,2508; 0,2442 pada kecepatan 5 m/s, 10 m/s, dan 15 m/s dengan penurunan nilai lebih stabil pada variasi kecepatan angin. Sedangkan nilai Cd thom rotor sebesar 0,6487; 0,5333; 0,4959 pada kecepatan 5 m/s, 10 m/s, dan 15 m/s juga lebih besar dibandingkan flettner rotor sebesar 0,5705; 0,4537; 0,4229 pada kecepatan 5 m/s, 10 m/s, dan 15 m/s. Perhitungan gaya thrust (Fr) menunjukkan peningkatan signifikan pada kedua tipe rotor seiring kenaikan kecepatan aliran, dengan kontribusi terbesar pada thom rotor. Hambatan total baru kapal (RT New) menurun secara relatif terhadap kondisi awal, menandakan adanya efisiensi propulsi tambahan. Maka penambahan turbin magnus mampu memberikan gaya dorong tambahan, mengurangi hambatan total, serta meningkatkan efisiensi operasional kapal. Thom rotor menghasilkan gaya angkat yang lebih stabil, sementara flettner rotor lebih efisien dalam menekan hambatan, sehingga pemilihan tipe rotor dapat disesuaikan dengan kebutuhan operasional kapal.
Characterization of Density and Stability of Oil Palm Empty Fruit Bunch Briquettes without Binder under Variations of Molding Temperature and Compaction Pressure Muhammad Ravi Albasyit; Yolli Fernanda; Refdinal Refdinal; Andre Kurniawan
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 4 (2025): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i4.902

Abstract

The dependence on fossil fuels in Indonesia continues to increase in line with the growing energy consumption, thus necessitating alternative energy sources that are more environmentally friendly and sustainable. Oil palm empty fruit bunches (OPEFB) are agro-industrial waste with great potential to be utilized as raw material for briquette production; however, their utilization remains suboptimal. This study aims to analyze the effect of molding temperature and compaction pressure on the density and stability of binderless OPEFB briquettes. The research method employed is experimental, using a quantitative descriptive-analytical approach with non-carbonized briquettes. The treatment variations include molding temperatures (230°C, 250°C, and 280°C) and compaction pressures (1 MPa, 3 MPa, and 5 MPa) applied to two types of materials, namely dried and undried OPEFB. The results indicate that increasing temperature and compaction pressure significantly enhances briquette density. At a temperature range of 250–280°C and a pressure of 5 MPa, the briquettes achieved the highest density (>1.0 g/cm³) with strong shape stability. The thermoplastic lignin content in OPEFB melts at high temperatures, acting as a natural binder. Briquettes with a density ?0.80 g/cm³ exhibited strong physical integrity, while those with a density <0.70 g/cm³ tended to be brittle. It can be concluded that the optimum conditions for producing high-quality binderless OPEFB briquettes are achieved at a temperature range of 250–280°C and a compaction pressure of 5 MPa, resulting in briquettes with excellent density and shape stability suitable as a renewable alternative energy source
Characterization Of Bioethanol From Cassava As A Fuel In Gasoline Engines Muhammad Ihsan; Yolli Fernanda; Arwizet K; Andre Kurniawan
Jurnal Vokasi Mekanika (VoMek) Vol 7 No 4 (2025): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v7i4.913

Abstract

The energy demand in Indonesia continues to increase, particularly in the transportation sector, which remains highly dependent on fossil fuels such as gasoline. This dependency causes several issues, including the depletion of fossil fuel reserves and the rise of greenhouse gas emissions that negatively impact the environment. One potential solution to address these challenges is the development of bioethanol as a renewable and environmentally friendly alternative fuel. Bioethanol can be produced from starchy materials, one of which is white cassava (Manihot esculenta), known for its high productivity and wide availability in Indonesia. The production process of bioethanol consists of several stages, including liquefaction, fermentation, and distillation, where fermentation temperature plays a crucial role in determining the ethanol yield. Previous studies have shown that variations in fermentation temperature significantly influence the efficiency of bioethanol production. This study aims to characterize bioethanol produced from cassava fermentation at various temperature variations and to evaluate its potential as a fuel for gasoline engines. The results are expected to contribute to the improvement of bioethanol production efficiency and to promote cassava utilization as a renewable energy source in supporting national energy sustainability.
Calculation of High Pressure Heater Efficiency in the Feedwater System of PT PLN IP Teluk Sirih Unit 2 Steam Power Plant Zulvani Adha; Andre Kurniawan; Arwizet K; Yolli Fernanda
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 Rezki Alhakim; Randi Purnama Putra; Yolli Fernanda; Fitrah Qalbina
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.
SolidWorks Flow Simulation: Selecting the optimal mesh for conducting CFD analysis on a centrifugal fan Salmat Salmat; Delima Yanti Sari; Yolli Fernanda; Febri Prasetya
Journal of Engineering Researcher and Lecturer Vol. 2 No. 3 (2023): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v2i3.104

Abstract

The accuracy of mesh use determines the suitability of simulation results with experimental test results, therefore it is necessary to study the type and number of mesh used for flow simulation. This study aims to investigate the type of mesh and the number of cells that are appropriately used in the simulation of centrifugal fans using the Solidworks Flow Simulation module. The research was conducted by comparing the simulation results with the experimental results on centrifugal fans that have been carried out by previous studies. In this research, the type of mesh used is global mesh. The parameter of determining the number of cells is done by varying the mesh level because the mesh level affects the number of cells. In this simulation study, the boundary condition is set to one flow volume of 5 m3/h and a rotation speed of 92.362 rad/s. In this study, the total pressure and efficiency of the centrifugal fan are the things that are seen from the comparison of flow simulation with the experiment. Based on the simulation results that have been carried out, mesh levels 1 to 4 show results that differ significantly from the experimental results. At machine levels 5 to 7, the results are close to the experimental results, but the closest total pressure and efficiency values are at mesh level 5. The results of this study can be a reference for research that simulates centrifugal fans.
Optimizing student learning in Computer Numerical Control subject: A comprehensive analysis of influential factors Muhammad Al Fadri; Yufrizal A; Yolli Fernanda; Febri Prasetya
Journal of Engineering Researcher and Lecturer Vol. 2 No. 3 (2023): Regular Issue
Publisher : Researcher and Lecturer Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58712/jerel.v2i3.114

Abstract

The learning outcomes achieved by students are influenced by many factors. This study aims to determine the level of support of factors (motivation, interest, family, teacher's role, learning methods and learning facilities) that influence the learning process in achieving student learning outcomes in CNC learning in class XI. The subjects in the study were Class XI students majoring in Mechanical Engineering at SMK Negeri 5 Padang in the 2022/2023 academic year totalling 37 people. Because the number of research subjects (population) is less than 100 people, so all of them are taken as samples or total sampling. Data collection was carried out using observation, questionnaires and documentation. Data analysis techniques using descriptive statistical techniques. From the data analysis, it shows that of each factor studied, the learning facility factor has the lowest level of support for student academic success compared to other factors that have been studied by researchers. Therefore, learning facilities at SMK Negeri 5 Padang in CNC subjects need to be improved again to support the student learning process and achieve better learning achievements for students.
Co-Authors - Primawati A, Yufrizal Abdillah Irfan Abdu Idham Adam Mandra Suwandi Afdal Faisal Ahmed, Shabir Akbar, Arifki Akhmad Rais Ambiyar, Ambiyar Aminuyati Andika Putra ANDIKA SAPUTRA Andre Kurniawan Andre Kurniawan Andri, Junil Arafat, Andril Arwizet Arwizet Arwizet Arwizet, Arwizet Arwizet K Arwizet. K Asadellah, Dimas Pandhu Ashekul Islam Azis, Ismail Badri Kurniawan Budi Syahri Budi Syahri Delima Yanti Sari Desyandri Desyandri Devky Meinaldi Fernanda Dieter Rahmadiawan Diki Afrianto Dimas Pandhu Asadellah Dionova, Aldi Dori Yuvenda Durain Parmanoan Dwi Sakti Putra DWI SURYANTO Egis Egis Eko Indrawan Elvira Zondra, Elvira Erizon, Nelvi Fadhilah Fadhilah Fadli Ramadhan Fadri, Muhammad Al Fahrendra, Aqsal Fajar Surya Farhan Rahmat Putra Fathi Aulia DZ Febri Prasetya Felia Maresta Fido Delfri Tamasya Firma Yulianis Firman Firman Fitrah Qalbina Fitri Amelia Fonny Maswija Priscilla Fretina Sari Hadi, Farhan Handayani, Meisuri Handrianto Handrianto Haris Yuliardiansyah Ikhsan, Ghufra Irlido Irwansyah Irzal Irzal Irzal, Irzal Jasman Jasman Kandena Putra, Tegar Kiwata, Takahiro Kresna Adi Prasetya La Ode Ahmad Barata M Chalid Kurnia M. Ilham Anugrah Illahi Mega Oktaviani Mochammad Haikal Muhammad Akhbar Muhammad Al Fadri Muhammad Bayu Septian Muhammad Fadil Al Rahman Muhammad Firdaus Muhammad Ihsan Muhammad Iqbal Muhammad Raihan Muhammad Ravi Albasyit Muhammad Riski Hidayat Muhammad Shiddiq Muhammad, Maghfiridhani Mulianti Nasution, Ridhollah Nelvi Erizon Nurdin Hendri Nurwijayanti Pratomo, Muhammad Agung Primawati Primawati, Primawati Purwantono Purwantono Purwantono, Purwantono Putra, Kevinda Putra, Randi Purnama Rafki Irianto Rahmadiawan, Dieter Randi Purnama Putra Rano Hanif Refdinal Refdinal, Refdinal Refdinal, Refdinal Refitra Irawan Remon Lapisa Revaldo Nur Hidayat Rezki Alhakim Ridhatul Arif Ridhollah Nasution Riezky Hidayattullah Rifelino Rifelino Riki Saputra Riky Satria Rizki Agustian Rizki Ramadhan Nasution, Muhammad Robby, Muhammad Rudy Anarta Salmat Salmat Salmat, Salmat Seprianto, Ekon Sherly Rahmayani Shi, Shih-Chen Shih-Chen Shi Sri Riski Putri Primandari Sri Rizki Putri Primandari Syahril Syahril Syaiful Salim Teki Haryono Toto Sugiarto Usin Usin Waskito Wei-Ting Zhuang Willy Vernando Yoga Rizki Ananda Yovindra, Difa Yufrizal Yufrizal Yusmaita, Eka Zainal Abadi Zhuang, Wei-Ting Zulvani Adha