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Politeknik Negeri Lhokseumawe Jl. Banda Aceh-Medan Km 280 Buketrata, Lhokseumawe, 24301, Aceh, Indonesia
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Jurnal Polimesin
Published by Politeknik Negeri Lhokseumawe
ISSN : 16935462     EISSN : 25491199     DOI : http://dx.doi.org/10.30811/jpl
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering
Polimesin mostly publishes studies in the core areas of mechanical engineering, such as energy conversion, machine and mechanism design, and manufacturing technology. As science and technology develop rapidly in combination with other disciplines such as electrical, Polimesin also adapts to new facts by accepting manuscripts in mechatronics. In Biomechanics, Mechanical study in musculoskeletal and bio-tissue has been widely recognized to help better life quality for disabled people and physical rehabilitation work. Such a wide range of Polimesin could be published, but it still has criteria to apply mechanical systems and principles. Exceeding the limitation has been a common reason for rejection by those outside the scope. Using chemical principles more than mechanical ones in material engineering has been a common reason for rejection after submission. Excessive exploration of the management within the discipline of Industrial Engineering in the manufacturing technology scope is also unacceptable. The sub-scope biomechanics that focuses on ergonomics and does not study movement involving applied force on the bio-tissue is also not suitable for submission.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 503 Documents
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Design and Manufacture of Portable Coffee Roaster with LPG Heater System Dedi Suryadi; Satryo Ramadhani; Agus Suandi; Nurul Iman Suparrdi; Novalio Daratha
Jurnal POLIMESIN Vol 21, No 1 (2023): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i1.2622

Abstract

Bengkulu Province is one of Indonesia's top coffee producers. However, coffee processing is still done traditionally. Therefore, modern processing is required, particularly in the roasting process, which is vital in deciding the flavor of the coffee. This study aims to design, build, and test a low-energy coffee roaster with a capacity of 2 kg. The components of a coffee roaster are designed according to the demands and relevant standards, such as drum volume, drum material, shaft size, pulley size, belt, burner stove, and motor parameters. The coffee roaster is then tested by altering the distance between the fire holes to 10, 15, and 20 mm with a diameter of 3 mm, as well as varying the rotating speed of the drum to 60, 65, and 70 rpm and varying the coffee varieties, namely Robusta and Arabica. The testing of coffee roasting equipment with a capacity of 2 kg went smoothly. The results show that the ideal distance of the stove burner hole to attain 200 °C was discovered at a distance of 10 mm and a distance of the stove to the drum of 10 mm with a time of 17.24 minutes. For Robusta and Arabica coffee beans testing, the light roast should be roasted for 10 minutes. The medium roast requires 15 minutes of roasting time. And the dark roast requires a 20-minute roasting process. Furthermore, the rotating speed of the drum has little influence on the character of roasted coffee beans
Optimization and monitoring of solar power plant as a hybrid energy for tea leaf dryer based on SCADA system Syahid, Syahid; Larasati, Pangestuningtyas Diah; Pramurti, Adeguna Ridlo; Muqorrobin, Mochamad; Riyadi, Aji Hari
Jurnal Polimesin Vol 22, No 2 (2024): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i2.4607

Abstract

Previous research has discussed tea drying machines with energy sources from PLN. Tea drying machines with refrigerant systems require large electrical energy costs. The electrical energy produced by a tea drying machine is proportional to its performance and cost. This research designed a 400 WP solar cell (PLTS) as a power supply for drying tea leaves. PLTS was combined with a PLN electricity source. Hybrid energy from PLTS and PLN was designed to maximize the use of electrical energy used by drying tea leaves. PLC and SCADA were used to monitor input current, output voltage, and output power. PLC and SCADA can optimize load requirements. When the solar radiation received by the solar panels was not optimal, PLN was able to back up load requirements. The average voltage produced by hybrid energy was 232.4 V. Hybrid energy was able to save power usage of 108.92 W or 12.8% of the load power requirements
Optimalisasi sistem tata udara gedung perkantoran bertingkat dengan metode six sigma (Studi kasus gedung PT.Bank Aceh cabang Lhokseumawe) Syamsuar Syamsuar
Jurnal POLIMESIN Vol 16, No 1 (2018): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v16i1.549

Abstract

The use of energy in the air system of PT. Bank Aceh Lhokseumawe branch annually averages 60 - 75% of total energy consumption in buildings. The purpose of this research is to optimize energy use in air system continuously using Six Sigma approach. The six sigma approach is expected to reduce the cost of using the air system system without neglecting the comfort level according to the national comfort standard (SNI). The problem faced by the air system is the existence of over cooling load (over cooling load), the value reaches the figure beyond the initial 60,000 watts planning capacity. The calculation results obtained actual average cooling load reached 75,580.3 watts. It is known that the cooling overload is caused by several factors, namely: the quantity of occupant / human, the air ventilation factor, the management factor of electric appliances usage, the lighting factor, and the solar radiation / transmission factor. Solutions to improve the air conditioning system by minimizing the factors that cause over cooling load. The results of the improvement get a cooling load of 57,340.9 watts which means savings of 24.2%, or monthly electrical energy savings of 4,428.324 kwh / month or equivalent to 50,739.888 kwh / year. Keywords: cooling load, six sigma, optimization, critical to quality
Optimasi Sistem Pendingin untuk Instalasi Penyimpanan Sementara Bahan Bakar Nuklir Bekas di BATAN Nurul Hanifah; Ratiko Ratiko; I Wayan Sugita; Ragil Sukarno
Jurnal POLIMESIN Vol 19, No 1 (2021): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v19i1.2096

Abstract

Bahan Bakar Nuklir Bekas (BBNB) yang dihasilkan oleh Reaktor G.A. Siwabessy di Serpong merupakan limbah radioaktif yang berbahaya. Sesuai International Atomic Energy Agency (IAEA) – Safety Standards, BBNB harus disimpan sedemikian rupa sehingga tidak membahayakan manusia serta lingkungan. Metode penyimpanan BBNB yang banyak digunakan adalah dengan disimpan pada kolam penyimpanan yang berfungsi memproteksi radiasi yang ditimbulkan oleh BBNB serta untuk mendinginkan panas peluruhan (decay heat) yang dipancarkan oleh BBNB. Salah satu komponen utama di IPSB3 adalah sistem pendingin menggunakan chiller yang diperlukan untuk mendinginkan air kolam BBNB dan mendinginkan ruangan Instalasi Penyimpanan Sementara Bahan Bakar Nuklir Bekas (IPSB3). Tujuan penelitian ini adalah untuk mendapatkan nilai decision variables (beberapa variabel yang mempengaruhi kondisi optimum yang diinginkan) pada chiller di IPSB3 sehingga diperoleh safety dan cost yang optimum. Metode yang dilakukan dalam penelitian ini dengan melakukan pengambilan data berupa pengukuran pada panel chiller menggunakan alat PQA HIOKI 3197; menggambar desain gedung IPSB3 menggunakan program drawing 3D Google SketchUp untuk input data perhitungan cooling load menggunakan Energy plus software dan melakukan perhitungan optimasi dengan software matlab. Hasil yang diperoleh dari analisis konsumsi daya kompresor setelah optimasi sebesar 34,84 kW. Hasil akhir optimasi didapatkan nilai tengah dimana untuk safety sebesar 618,82 Bq/m3 dan cost sebesar Rp.872.197.000. Dari hasil optimasi multi-objective dengan genetic algorithm yang dilakukan di penelitian ini didapatkan hasil yang memenuhi kriteria fungsi safety namun dengan cost yang lebih rendah.
Analysis of liquid rocket propellant in nitroglycerin injector reactors maryono maryono; Muhammad Akhlis Rizza
Jurnal POLIMESIN Vol 21, No 3 (2023): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i3.3826

Abstract

The propulsion of the rocket is due to the thrust resulting from the combustion rate. The propellant energy can be increased by increasing the fuel pressure and temperature of the propellant. Increasing the pressure and temperature of the propellant will increase its combustion rate and the operating conditions of the rocket motor. The most effective liquid propellant used is Nitroglycerin (NG). Nitroglycerin was prepared using the glycerol nitration method with the principle of an injector-based reactor. Therefore, in this research, nitroglycerin was made using the Injector Reactor method with variations in flow rate and injection volume. The results showed that the effect of variations in flow rate and solution volume on the synthesis of nitroglycerin caused a change in solution temperature. Flow rate is closely related to the volume of solution used. The higher the temperature produced, the more heat energy will increase so that the pressure and combustion rate of the propellant increase. The most optimum results use a flow rate of 200 µm/s and a solution volume of 6 ml of glycerin, nitric acid, and sulfuric acid each with a temperature of 37.6oC.
Perancangan dan pembuatan mesin pengering (Dryer ) produk perkebunan dan pertanian Muhammad Razy.A
Jurnal POLIMESIN Vol 8, No 1 (2010): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jp.v8i1.1336

Abstract

Pengering produk pertanian dan perkebunan sistem konveksi paksa adalah salah satu teknologi tepat guna yang berfungsi untuk mengeringkan produk-produk pertanian dan perkebunan dengan menggunakan sistem konveksi paksa. Alat pengering ini merupakan solusi untuk mendapatkan hasil dari produk yang lebih baik bila dibandingkan dengan pengeringan secara tradisional (dijemur dibawah sinar matahari langsung). Alat pengering sistem konveksi paksa terbagi dalam 3 (tiga) bagian, yaitu: Ruang Bakar yang terbuat dari pelat gavanis ketebalan 5 mm yang dilintasi oleh pipa pemanas yang berfungsi sebagai tempat untuk memanaskan udara, Ruang Pengering sebagai tempat untuk menaruh produk yang akan dikeringkan, dan Blower yang berfungsi untuk meniup udara ke dalam pipa pemanas. Didalam ruang Pengering terdapat 5 (lima ) rak pengering yang berfungsi sebagai tempat untuk menaruh produk yang akan dikeringkan, dan di dalam Ruang Pengering terdapat sirip-sirip yang berfungsi untuk mengalirkan udara panas sehingga terdistribusi ke setiap rak pengering. Hasil pengujian kelayakan alat pengering ini didapat suhu rata-rata sebesar 53,94 2 dengan menggunakan 30 kg bahan bakar dalam waktu 2,5 jam.Kata Kunci :Tanur, Ruang Pengering, Distribusi, Sistem Konveksi Paksa, Tray, Galvanis, Aluminium voil.
Kaji Eksperimental Pengaruh Campuran Bahan Bakar Bioetanol-Bensin Terhadap Unjuk Kerja Mesin SI Asnawi Asnawi; Adi Setiawan; Muhammad Sayuthi; Tri Waluyo; Hagi Radian
Jurnal POLIMESIN Vol 20, No 2 (2022): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i2.2645

Abstract

Bioethanol is a clean fuel, renewable energy source that can be used in place of fossil fuels. Bioethanol has similar characteristics to gasoline fuel, making it an excellent alternative fuel for SI engines, contributing to the reduction of air pollution, the increased use of biofuels, and the removal of fossil fuel consumption. Analysis of the SI engine performance using gasoline fuel with an octane rating of 90 and gasoline-bioethanol blends containing up to 20% bioethanol concentration, each fuel blended at 5% by volume fraction. The purpose of this study is to present the experimental results for a spark ignition (SI) engine with a single injector that operates by using a gasoline-bioethanol blend as fuel. Analysis of the SI engine performance by using gasoline fuel with an octane rating of 90 and gasoline-bioethanol blends containing up to 20% bioethanol concentration. Each fuel was blended with bioethanol at an interval of 5% by volume fraction. The test was conducted on an SI engine with a capacity of 1500 cc, four cylinders, and a single injector was used to distribute fuel to each cylinder through the intake manifold. The shaft of the engine is connected to a 75 kW of eddy current dynamometer shaft to measure the engine torque. The engine load is controlled using an interface computer system. Load on an engine is done by increasing braking on the dynamometer, and real-time signals from the sensors are recorded. Each fuel sample is operated at full load or wide-open throttle (WOT) at speeds ranging from 1000 to 5500 revolutions per minute (rpm). The experiments show that adding bioethanol to gasoline fuel can have a significant effect on the single injector SI engine performance. When the bioethanol concentration of 10% (E10) by volume is used, it is possible to maintain engine power with lower fuel consumption or lower the energy supply to the engine cylinder, thereby increasing the thermal efficiency of the single-injector SI engine by 6.33% compared to gasoline fuel.
An investigation into the crashworthiness criteria of a top-hat structure with a dent-type crush initiator through numerical analysis Purnama, Harry
Jurnal Polimesin Vol 21, No 5 (2023): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i5.4126

Abstract

Ensuring the safety of passengers and the battery compartment in electric vehicles during frontal collisions is of utmost importance. This research aims to enhance the design of the top-hat structure used in car front rails by incorporating a crush initiator as the weakest section. The addition of a crush initiator optimizes the crashworthiness criteria by reducing peak force and increasing energy absorption. Numerical simulations were conducted using ABAQUS to validate the findings and compared against experimental results from references. The results demonstrate that the development of a top-hat structure with a dent-type crush initiator led to 27.5% decrease in peak force and 18.75% increase in energy absorption. The improvements in peak force and energy absorption could reduce the impact force and allow the crumple zone to completely absorb the kinetic energy during a collision, positively affecting the safety of passengers and battery compartments in electric vehicles
Analisis kegagalan pipa pecah2inch antara ko drum dan burn pit Akhyar Ibrahim
Jurnal POLIMESIN Vol 6, No 2 (2008): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jop.v6i2.1371

Abstract

Analisa kegagalan dilakukan pada pipa penyalur amonia 2 inchi yang pecah, yang digunakan untuk memindahkan cairan amonia dari tangki KO tahap pertama ke tangki SMS (Steamer Tank) dan Burn pit di sebuah industri pupuk. Berdasarkan informasi yang dikumpulkan dari lapangan, Inspeksi dan pengujian laboratorium, studi literatur maka dapat disimpulkan bahwa pipa ini pecah karena adanya tekanan dalam pipa yang tinggi dan amonia turut mempercepat penjalaran retak pada cacat lasan berbentuk undercut pada permukaan dalam pipa yang mengakibatkan sepanjang permukaan pipa pecah. Pipa 2 inchi API SL Sch 40 ini dibuat dengan proses seamless yang memiliki kelemahan struktur kristalografis dalam arah horizontal yang mengakibatkan pipa pecah dalam arah tersebut. Kombinasi cacat mikro, akibat mekanis dan metalurgis ini besar kemungkinan menjadi inisiasi retak. Pipa yang bertakik (ada inisiasi retak) tidak aman terhadap tekanan tinggi: dan demikian sebaliknya. Karena itu, direkomendasikanuntuk memantau pengelasan secara sempurna atau mengganti material yang dengan grade yang: lebih tinggi serta program perawatan harus diterapkan dengan baik. iKata kunci: Pipa, inspeksi, kegagalan,undercut
Photovoltaic (PV) thermal performance simulation using segmentation lapping fin passive cooling Ahmad Yonanda; Amrizal Amrizal; Harmen Harmen; Ahmad Riszal; Fauzi Ibrahim
Jurnal POLIMESIN Vol 20, No 2 (2022): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i2.3041

Abstract

The sun is a renewable energy source that has several advantages such as being easy to obtain, free of pollution, and available in sufficient quantities. The heat energy received by the photovoltaic can cause an increase in surface temperature, resulting in a decrease in electrical efficiency. One of the efforts to increase photovoltaic electrical efficiency is using air cooling, by adding absorber fins or thermal photovoltaic (PV/T). The lapping type fin has superior performance in reducing the temperature of the PV module compared to the linear (conventional) fin type. The purpose of this study was to compare the performance of thermal PV using conventional fins with lapping segmentation fins carried out using the CFD approach using ANSYS Fluent. The simulation test procedures include: making linear fin geometry (conventional), linear lapping and segmentation lapping, conducting mesh quality studies, and determining boundary conditions and modeling parameters. Modeling variations in the direction of airflow 0°, 15°, 30°, 45°, 60°, 75°, and 90°. The numerical simulation results show that the use of segmented lapping fins can reduce the PV surface temperature by 1.79 °C or about 4.11% compared to conventional (linear) lapping in the airflow direction of 90º (parallel to the fins). The results of this study support the use of integrated PV and passive cooling systems to reduce efficiency losses in actual conditions, where there is a multidirectional airflow characteristic, which may not be advantageous for conventional heatsinks.

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