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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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Kaji efisiensi temperatur penukar panas dengan variasi aliran untuk aplikasi pengering syukran syukran
Jurnal POLIMESIN Vol 16, No 2 (2018): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v16i2.562

Abstract

Abstrak Heat exchanger atau alat penukar panas adalah alat-alat yang digunakan untuk mengubah temperatur fluida atau mengubah fasa fluida dengan cara mempertukarkan panasnya dengan fluida lain. Pada sebuah penukar panas kemampuan mempertukarkan panas sangat ditentukan oleh tipe dan jenis aliran fluida yang melewati penukar panas. Secara garis besar penukar panas dibagi berdasarkan arah aliran fluidanya. Berdasarkan arah aliran fluida penukar panas  dibedakan menjadi 3 (tiga) jenis aliran, yaitu aliran searah (parallel flow), aliran berlawanan (counter flow) dan aliran silang (cross flow). Saat ini penukar panas banyak dipakai dalam  industri pengeringan produk-produk pertanian, perkebunan dan perikanan skala kecil dan menengah. Penggunaan penukar panas dalam bidang pengeringan saat ini sudah menjadi kebutuhan untuk mengatasi permasalahan produktifitas pengeringan. Umumnya penukar panas yang digunakan adalah tipe aliran berlawanan. Beberapa penelitian telah dilakukan untuk mengetahui efektifitas penukar panas tersebut yang umumnya berfokus pada jenis aliran berlawanan. Penelitian penelitian spesifik yang mengkaji perbandingan efisiensi penukar panas  untuk ketiga jenis aliran belum ditemukan. Penelitian ini dilakukan untuk mengetahui efisiensi temperatur penukar panas untuk jenis aliran jenis aliran melintang, sejajar, dan  berlawanan. Metode penelitian dilakukan fabrikasi 3 unit exchanger tipe gas-gas dengan dimensi 50 (P) x 10 (L) x 30 (T) dengan jumlah tube 17 susunan. Hasil  penelitian menunjukkan bahwa efisiensi temperatur untuk ketiga jenis penukar panas tersebut adalah 21,3% aliran melintang, 17,3% aliran berlawanan dan 15,9%  aliran sejajar. Hasil penelitian menyimpulkan bahwa efisiensi temperatur tertinggi diperoleh jenis penukar panas aliran melintang. Kata kunci : Penukar panas, aliran sejajar, aliran berlawanan, aliran silang, temperatur.  Abstrack Heat exchangers or heat exchangers are the means used to change the temperature of the fluid or to change the fluid phase by exchanging heat with other fluids. In a heat exchanger the heat exchange ability is greatly determined by the type and type of fluid flow passing through the heat exchanger. Broadly speaking the exchanger is divided based on the direction of fluid flow. Based on the direction of fluid flow exchanger is divided into 3 (three) types of flow, namely parallel flow, counter flow and cross flow. Currently, heat exchangers are widely used in the drying industry of small and medium-sized agricultural and small-scale plantation and fishery products. The use of exchangers in the field of drying is now a need to overcome the problems of drying productivity. Generally the exchanger used is the opposite flow type (counter flow). Several studies have been conducted to determine the effectiveness of these exchangers which generally focus on the opposite type of flow. Specific research studies that reviewed the efficiency of exchangers for the three types of flow have not been found. This research was conducted to find out the efficiency of heat exchanger temperature for flow type of cross flow, parallel flow and counter flow type. The research method was fabricated 3 units of gas-gas exchanger type with dimension 50 (P) x 10 (L) x 30 (T) with the number of tubes 17 staggered arrangement. The results show that the temperature efficiency for the three types of heat exchanger is 21.3% cross flow flow, 17.3% flow counter flow and 15.9% parallel flow flow. The results concluded that the highest temperature efficiency obtained by cross flow flow type exchanger. Keywords: Heat exchanger, parallel flow, counter flow, cross flow, temperature
Geometry Improvement and Flow Simulation in the water level control valve based on the CAD/CAE and DOE integrated system Nguyen Huu Tho; Phan Hoang Phung; Huynh Van Nam; Nguyen Vu Anh Duy
Jurnal POLIMESIN Vol 19, No 2 (2021): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v19i2.2114

Abstract

Floating valve is a type of valve which can open and close automatically based on the level of water in the tank by Archimedes force without using electric-based control signals. However, there are no engineering reports of the influences of factors to the liquid flow through the valve with the considerations of multiple objective obtimization based on design of experiments (DOE) in the context of our country until now. Many products in the domestic market have been paid more attention by the customers but still have several disadvantages such as the practical malfunctions of floating valve. Thus, this study presents an integrated approach of CFD simulation and DOE-based multi-criteria optimization for proposed valve design. This technique allows to identify the influencing factors to the valve’s goals of volume flow rate and the force which exerts into the rubber rubber to create a gap distance in order that the float valve can operate. In this study, several factors used as inlet pressure, a gap distance of rubber sheet, pressure vent hole diameter and orifice diameter. CFD (computational fluid dynamics) based simulation technique integrated into experimental design assists us to determine the most suitable dimensional and operational parameters of water level-control float valve. The numerical simulation results confirmed that design valve are appropriate and potential in the practice. The integrated simulation framework can be considered a general and effective way to analyze several types of other valves.
CFD Simulation of oxy-fuel combustion using turbulent non-premixed combustion with medium-rank coal from Kalimantan Indonesia Agus Prasetyo Nuryadi; R.J. Komara; M.P. Helios; I. Wulandari; Chairunnisa Chairunnisa; Fitrianto Fitrianto
Jurnal POLIMESIN Vol 21, No 4 (2023): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i4.3830

Abstract

Carbon capture technology connected with oxy-fuel combustion has a high potential for reducing CO2 emissions, particularly in coal-fired power plants. However, the distinct characteristics of each coal depend on its origin. This study analyzes coal combustion from Kalimantan using a drop tube furnace and varying the volume of oxygen: Coal (21 vol.% O2), OF25 (coal with 25 vol.% O2), OF30 (coal with 30 vol.% O2), the non-premixed combustion model and a structured grid. Probability Density Function (PDF) models were used for combustion chemistry. The overall combustion temperature distribution and the amounts of O2, H2O, C, and CO2 in combustion products were visualized. The numerical results show that increasing the volume of oxygen leads to an increase in temperature distribution for OF25 and OF30, but the flame is shorter than for Coal. During combustion, the mass fraction of oxygen remains in the furnace and H2O increases. Carbon burns quickly and is depleted, whereas the CO2 content increases along with the volume of oxygen, making the CO2 capture process easier. The results obtained from the numerical analysis can offer valuable insights for enhancing the design of combustion chambers in oxy-fuel boilers for better modeling of pulverized coal especially using Kalimantan coal.
Rancang bangun kopling cakar persegi dengan bantuan komputer (cad) Irwin Syahri Cebro
Jurnal POLIMESIN Vol 7, No 1 (2009): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jp.v7i1.1342

Abstract

Kopling cakar persegi dapat meneruskan momen dalam dua arah putaran. Parameter desain dari kopling cakar persegi sangat tergantung pada daya dan putaran yang akan diteruskan, faktor koreksi serta jenis bahan yang digunakan. Disain kopling cakar persegi secara manual disamping memberikan hasil yang kurang teliti juga sangat tidak efektif dalam penggunaan waktu. Penelitian ini bertujuan mengembangkan sistem CAD untuk menghitung dan menggambarkan kopling cakar persegi. Perancangan kopling cakar persegi dengan bantuan komputer (Computer Aided Design, CAD) diperlukan untuk menentukan parameter desain kopling cakar persegi serta pembuatan gambar kerja secara otomatis. Dengan sistem ini efesiensi waktu dan akurasi desain dapat lebih akurat dibandingkan dengan proses perancangan kopling cakar persegi secara manual. Struktur program yang dibangun terdiri dari bagian input data rancangan, bagian output parameter desainhasil perhitungan dan gambar kerja.Kata kunci : Kopling cakar persegi, parameter desain, gambar teknik. 
Kajian karakteristik perpindahan panas pada ruang sistem pengering/pengasapan dengan enersi panas. dari bahan bakar 0 Nawawi Juhan
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.v7i2.1376

Abstract

Penggunaan lemari pengering untuk pengeringan masih mempunyai kelemahan, yaitu temperatur pengering di dalam lemari pengering sering tidak seragam atau tidak sama di setiap rak yang terdapat dalam lemari pengering, dimana temperatur udara panas pada rak-rak pengering yang bejauhan dengan sumber panas atau pada rak-rak makin ke atas semakin menurun. Jika ketidaksamaan temperatur fuida pengering pada setiap rak dalam lemari pengering tersebut tidak leratasi, maka hasil pengering akan menurun kualitasnya yang diakibatkan oleh tidak meratanya suhu pengering yang diterima setiap produk yang dikeringkan. Masalah ini diyakini dapat diatasi dengan menahan laju gas panas keluar dari ruang pengering dengan membuat sudut cerobong gas panas keluar yang tepat. Penelitian ini dilakukan untuk menentukan berapa sudut cerobong gas panas keluar peralatan pengering yang tepat sehingga didapat keseragaman temperatur di setiap rak yang terdapat dalam lemari pengering. Disamping itu juga untuk melihat pengaruh pengarah awal terhadap distribusi temperatur di dalam saluran peralatan pengering. Pengujiannya dilakukan . dengan membuat suatu sistem peralatan pengering dengan sistem aliran gas Panas alamiah, yang terdiri atas lima bagian utama yaitu ruang pembakaran, pengarah awal 2 buah tidak berlubang dan berlubang dibuat berbentuk V dengan sudut 3G, saluran aliran udara panas, ruang pengeringan dengan 7 buah rak pengeringan, dan cerobong 3 buah dengan sudut masing-masing 15”, 25”, dan 35” Pengkajian lebih laryut dilakukan terhadap karakteristik perpindahan panas dan pola aliran Nuida pada Ruang Sistem Pengering/Pengasapan untuk mendapatkan sistim dan peralatan pengering yang optimal dengan menggunakan energi bahan bakar dan temperatur yang lebih merata pada setiap rak di datam lemari pengering. Hasil penelitian menunjukkan, bahwa sudut cerobong sangat berpengaruh terhadap keseragaman distribusi temperature di dalam ruang pengering. Peralatan pengering dengan cerobong bersudut 15” dapat menghasikan. distribusi temperatur yang teratur, gradient temperature yang terjadi kecil di awal pemanasan dan setelah kestabilan tercapai distribusi temperature menjadi seragam di setiap rak dalam ruang pengering. Disamping itu Pengarah awal juga berpengaruh terhadap diistribusi di dalam saluran pemanas, dimana distribusi temperatur pada saluran pemanas dengan pengarah awal berlubang dan tidak berlubang sangat berbeda, ini disebabkan oleh pola aliran yang terjadi terutama pada sudut atap cerobong yang 15”. yang mana turbulensinya lebih besar dengan pengarah awal tidak berlubang. Karakteristik perpindahan panas yang terjadi seperti Grashof number, 'Rayleigh number, Nusselt number, dan koeffi. ien perpinduhan panas yang terjadi di dalam peralatan pengering dipengaruhi oleh ketinggian karakteristik, lebar karakteristik, dan geometri saluran (sudut saluran).Kata Kunci : Pengering Grashof Number, Rayleigh Number, Perpindahan Panas
Natural Dyes as a Photosensitizer from Dragon Fruit (Hylocereus polyrhizus) for Dye-Sensitized Solar Cells Kartika Sari; Sunardi sunardi; Dita Asa Panunggul; Agung Bambang Setio Utomo; Parmin Lumban Toruan; Ampala Khoryanton
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.v21i1.3082

Abstract

Natural Dye is one of the important materials of DSSC which absorbs photons from the sun’s rays and transmits the photoelectron. One of the natural dyes is Dragon fruit dye. The characterization of the optical and electrical properties of a sensitizer DSSC used a UV-Vis spectrometer, FTIR spectrometer, and solar power meter. The absorption spectra of the UV-Vis spectrometer are being measured by a wavelength range of  400 – 700 nm and show a maximum peak of 535 nm. The result of the FTIR spectrometer shows the functional group of  H-bond stretching, C=O, and C-O-H stretching vibrations.  It is a part of anthocyanin and chlorophyll.  Zinc Oxide (ZnO) paste coated on the Indium Tin Oxide (ITO) as the thin film is dipped in the Dragon fruit dye extracted for 30 hours. Thin film is prepared as the working electrode and counter electrode. The characteristic of current and voltage (I-V) as electrical properties are measured by the solar power meter.  The result of the current and voltage DSSC from Dragon fruit dye extracted coated ZnO obtained, indicated that the energy bandgap could be optimized to make a wide bandgap. ZnO thin film needs the Dragon fruit dye to decrease the surface and move electrons in the bandgap. The Dragon fruit dye extracted coated ZnO thin film could be used as a sensitizer since it will increase the correlation between the ZnO thin film and dye. And the last, it will improve the quality of solar cells as well.
Redesign of Rice Planting Tools Using an Ergonomics Approach Andriani, Meri; Irwanda, Muhammad Fanny; Nadya, Yusri
Jurnal Polimesin Vol 22, No 1 (2024): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i1.4200

Abstract

Farmers' work in planting rice is always with a bent posture, causing complaints of musculoskeletal disorders, this is a problem in research. The aim of the research is to identify farmers' complaints of musculoskeletal disorders when planting rice and determine the size of ergonomic tools. The method used is standard Nordic questionnaires to determine the point of complaint among farmers, anthropometry and percentiles are used to design the tool. Statistical tests are used to see valid, uniform, and normal data. Results and discussion, in the standard Nordiq questionnaire, it was found that farmers experienced more than 50% complaints of severe pain in the waist, left calf, right calf, left ankle, right ankle, left foot, and right foot. The design uses eight anthropometric dimensions: standing elbow height, palm length, palm width, middle finger length, shoulder width, body thickness, upper arm length, and hand length. All anthropometric dimensions were declared uniform, in the data adequacy test they were declared valid, and in the normality test, all data were declared normally distributed. The 5th percentile is used for the dimensions of shoulder width, standing elbow height, and palm length, and the 95th percentile is used for the dimensions of palm width, middle finger length, body thickness, upper arm length, and hand length.In conclusion, complaints of musculoskeletal disorders were identified as very painful, located at the point of complaint of the waist. The rice planting tool has ergonomic dimensions, the height of the tool is 88.1 cm, the diameter of the tool handle is 8.13 cm, the length of the handle is 11.4 cm, and the distance between the handle and the brake is 9.32 cm. The dimensions of the rice seed bag are 33.70 cm wide, the distance between the front and back of the bag is 23.19 cm, the bag height is 35.64 cm, and the bag length is 20.5 cm.
Analisa umur pahat karbida dengan menggunakan Bahasa pemograman C++ Ilyas Yusuf; Bukhari Bukhari
Jurnal POLIMESIN Vol 3, No 2 (2005): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v3i2.1446

Abstract

The Effect of Adding Aluminum Scrap to Motor Vehicle Mufflers to Reduce the Danger of Exhaust Emissions Ahmad Marabdi Siregar; Chandra Amirsyahputra Siregar; Khairul Umurani; Mulyadi Mulyadi; Tony Siagian; ML Teguh Samudra; Aufa Afika
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.v21i1.3263

Abstract

Air pollution due to motor vehicle exhaust emissions is increased. Polluted air harms human health dan the environment. Consequently, it is essential to make a sustained effort to reduce air pollution. The purpose of this research is to investigate the effect of adding aluminum scrap to the exhaust system of a motor vehicle on gas emissions composition. The motor vehicle exhaust system was modified to accommodate aluminum scrap placement. A gas analyzer was utilized to observe exhaust gas composition, such as carbon dioxide, hydrocarbon, and carbon monoxide.  Aluminum scrap with different masses was wrapped around the exhaust's inner tube in 50 gr, 70 gr and 90 gr. The engine speed was maintained at 500 rpm throughout the testing process. It was found that the temperature of the outer exhaust tube is in a range of 40 degrees Celsius to 50 degrees Celsius. The results revealed that the most appropriate amount of aluminum scrap was 90 gr n to reduce carbon monoxide, hydrocarbon, and carbon dioxide in an exhausts gas. The surprising outcome was 76.78 % of carbon monoxide content declined, and furthermore hydrocarbon, and carbon dioxide content were deteriorated by 61.63% and 78.37%, respectively
Harnessing CFD simulations and CAD design to optimize hydropower efficiency of a propeller turbine in the Maliringan River: acase study Nathanlius, David; Halim, Levin; Arthaya, Bagus Made
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.v22i2.4233

Abstract

This research focuses on improving hydropower production by designing a turbine for the MaliringanRiver in Kalimantan Selatan. The rotational speed and torque will be the focus of maximizing power generation. This research used Computational Fluid Dynamics (CFD) to understand how the fluid flows and how efficiently the turbine works. The simulations helped us see how the fluid flowed, the pressure differences, and the speed of the water inside the turbine. The software COMSOL Multiphysics imitates how the fluid behaves and interacts in real-life situations. The utilization of SOLIDWORKS played a crucial role in the turbine's design process, facilitating an accurate representation of the turbine's geometry and the subsequent fabrication of a prototype propeller turbine, featuring an outer diameter measuring 0.27 meters and an inner diameter measuring 0.113 meters. The methodology resulted in a power efficiency of 76.45%, showcasing the possibility of significant enhancements in the efficiency of hydropower generation. The broader ramifications of this study emphasize the feasibility of tailor-made turbines for local hydropower initiatives, thereby supporting Indonesia's renewable energy plan by providing sustainable and efficient energy alternatives. This study emphasizes the collaborative utilization of Computer-Aided Design (CAD) and CFD technologies in the progression of turbine technology, thereby establishing a basis for future investigations in hydropower optimization.

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