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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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Numerical study on the effect of box and polygon geometry in fin and tube heat exchanger on fluid flow and heat transfer Nugroho, Agung; Safi'i, Muhammad; Romadhon, Bukhori Putra; Wahid, Muhammad Abdul; Pujianto, Muhammad Edi
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.5624

Abstract

Currently, fin and tube heat exchangers are widely used in various engineering applications, including modern heat exchangers, automotive radiators, and Air Conditioning (AC) systems such as evaporators, and condensers. Enhancing their performance necessitates innovative designs, advanced application, and optimizes geometries to improve heat transfer efficiency. This study investigates the effect of box and polygon geometries on fluid flow and heat transfer in a split Air Conditioner (AC) fin and tube heat exchanger using simulation software. The research examines two tube arrangement-inline and staggered-across different fluid velocities (0.5 m/s, 1 m/s, 1.5 m/s, and 2.5 m/s) and heat flux values (100 W/m2 , 125 W/m2, 125 W/m2, and 150 W/m2 ). The numerical study revealed that the best thermal and hydraulic performance of the fin and tube heat exchanger, based on geometry variations between box and polygon tubes, was achieved with the polygon tube geometry, which resulted in a lower temperature around 23.41°C. This temperature confirmed an increase in heat transfer coefficient by approximately 5% and Nusselt number by about 3%. The best performance overall, considering both thermal and hydraulic aspects, was observed in the inline arrangement, especially for the polygon tube, which resulted in a lower temperature of around 26.38°C. This confirmed an improvement in the heat transfer coefficient by about 4% and the Nusselt number by 2.5%.
Optimizing LNG efficiency by implementing reliquefaction technology to reduce boil-off gas and enhance profitability Muhtadi, M. Zaky; Rayazen, Ichsan; Istiningrum, Andian Ari; Sugito, Bambang
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.5607

Abstract

Run an analysis of this abstract, focusing on its relevance, format, flow, and coherence. Technological advancements compel companies to enhance the efficiency of their business operations, including those in the oil and gas sector. Natural gas, particularly Liquefied Natural Gas (LNG), is a vital commodity in significant demand. A primary challenge within the LNG supply chain is minimizing the losses caused by gas evaporation (boil-off gas) during distribution and reception. This study proposes the implementation of a reliquefaction plant on a 170,000 m³ Floating Storage and Regasification Unit (FSRU). Through this innovative approach, this study aims to optimize the utilization of Boil-off Gas (BOG) and augment the company's revenue. The results indicate that the liquefaction plant can reduce BOG by 77 percent, significantly outperforming conventional methods. The economic feasibility analysis revealed a Net Present Value (NPV) of $82,892,970 and an Internal Rate of Return (IRR) of 25 percent, suggesting substantial profit potential. Furthermore, the reliquefaction of 1,777.6 MMBtu BOG per day could potentially increase the company's revenue by IDR 94,078,421,500 annually, surpassing initial estimates. This study contributes significantly to the advancement of more efficient LNG management technologies, providing concrete solutions to minimize energy waste and enhance profitability within the LNG industry. These findings facilitate the implementation of similar technologies at other LNG facilities, potentially transforming industry-wide practices.
Enhancing textile quality control with the application of teachable machine and Raspberry Pi as machine learning-based image processing Nugroho, Emmanuel Agung; Setiawan, Joga Dharma; Munadi, M.; Diki, M.
Jurnal Polimesin Vol 22, No 5 (2024): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i5.5308

Abstract

The adoption of image processing-based technologies in the textile sector is rising. This technology is commonly utilized to replace traditional sensor systems that are limited to a single function while also improving product quality control functions. Defects during the manufacturing process are a common problem in the textile business, particularly with fabric products. This study created a fabric quality control system that detects fabric problems using machine learning-based picture classification techniques. A D320p web camera detects rare and slap flaws, which are classified using open-source Google teaching machine software and processed on a Raspberry Pi 3B device. The laboratory-scale measurement was carried out on a prototype cloth rolling machine using the confusion matrix method. The test results reveal an average inference speed of 143.5 milliseconds, a frame rate of 6.45 fps, and a 98.56% accuracy rate. These results demonstrate that the proposed system is effective and efficient for detecting fabric defects, offering a promising solution for enhancing quality control in the textile industry. Future research could focus on scaling the system for industrial use and enhancing real-time performance.
Performance Analysis of a 2-Liter Solar Cooker with Comparison of Aluminum and Stainless Steel Containers Perangin angin, siwan edi amanta; Napitupulu, Richard
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.5720

Abstract

The utilization of solar energy can be applied to household needs, such as using electric stoves. Solar panels serve as a tool for converting heat into electricity, which is then used to power solar cookers as a substitute for LPG-powered stoves. This study was conducted at the Faculty of Engineering, HKBP Nommensen University, located at Jl. Sutomo No.4A Medan, North Sumatra. The objective of the study is to compare the performance of a solar cooker PV DC system with an aluminium cooking container to a Solar Cooker with a stainless steel cooking container, focusing on differences in the rate of temperature increase. The test results show that aluminium containers are better at conducting heat than stainless steel. For instance, when cooking 2 liters of water, the temperature increase rate in an aluminum container is 1.01°C per minute, compared to 0.91°C per minute in stainless steel. The thermal conductivity of aluminium is around 205 W/m°C with a density of about 2.7 g/cm³, while stainless steel has a thermal conductivity of only 15–25 W/m°C and a density of approximately 7.8 g/cm³. The highest average solar radiation during the test was 424.1 W/m². The solar cooker was able to cook potatoes to a normal level in 48 minutes, from 14:26 to 15:13 on August 3, 2024, reaching a final temperature of 100.1°C, under the lowest average radiation of 216.22 W/m². In another test, 104 grams of potatoes were cooked in 35 minutes, with the temperature increasing at a rate of 1.62°C per minute in the aluminium container, reaching a final temperature of 103°C. In contrast, the stainless steel container had a rate of 1.31°C per minute and reached a final temperature of 91.3°C.The test also showed that battery voltage has a significant impact on cooking efficiency, as it affects the power needed for cooking materials, such as water.
Harnessing Light-Emitting Diode technology for cutting-edge Photovoltaic module characterisation Ira Devi Sara; Fikrel Jasman; Hafidh Hafidh; Amir Zaki Mubarak
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.5625

Abstract

Significant advancements in Light-Emitting Diode (LED) technologies, including the availability of high-power LEDs at reduced costs, have rendered them a highly desirable and dependable solar simulator. However, there are still challenges in designing LEDs as solar simulators to evaluate the characteristics of specific solar modules across different technologies and sizes, particularly regarding spectral composition and spatial uniformity of irradiation. This work seeks to develop a prototype LED solar simulator capable of generating uniform light with stability of at least 90% (class C) throughout an illumination area of 54 cm × 67cm for laboratory instructional applications. The employed procedures encompass the selection of high-power LED bulbs, thermal management, electrical design, prototype fabrication, and performance assessment. The International Electrotechnical Commission (IEC) 60904-9:20 standard delineates the performance criteria for solar simulators and serves as a framework for constructing LED solar simulators. The study's results demonstrate that the LED solar simulator prototype has been successfully constructed and is categorized as class C, exhibiting a light non-uniformity and stability level of 10%. The capacity to delineate the current and voltage of a 50 cm × 30 cm small solar module under specified irradiance and temperature circumstances may be attained with a mean absolute error percentage of 0.01 and a root mean square error of 0.21. The hexagonal configuration of the LED array offers advantages for light design, including modularity and ease of expansion to achieve a broader illumination area. This arrangement can serve as an invaluable instrument to enhance solar energy research and maximize the performance of photovoltaic devices under regulated conditions.
Twist and chord optimization using the linearization method on the taper blade of a micro-horizontal axis wind turbineTwist and chord optimization using the linearization method on the taper blade of a micro-horizontal axis wind turbine Syaukani, Muhammad; Aryadi, Anugrah Wahyu; Arirohman, Ilham Dwi; Sofyan, Sarwo Edhy; Bahar, Aditiya Harjon; Sabar, Sabar
Jurnal Polimesin Vol 22, No 5 (2024): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i5.5540

Abstract

The research aims to optimize the geometry of taper blade profiles for the Horizontal Axis Wind Turbine (HAWT) to improve aerodynamic performance and minimize fabrication complexity. The study used blade linearization as an optimization method for identifying a desirable twist (β) and chord (Cr). This approach enhances accuracy and boosts computational efficiency. It simplifies the optimization process by reducing complexity. In contrast, traditional nonlinear methods are slower and more resource-intensive due to complex aerodynamic interactions. The best β and Cr distributions were found by linearization with elements 1 and 10 of the blade length and positions 5%, 15%, 25%, 35%, 45%, 55%, 65%, 75%, 85, and 95% of the blade elements. The linearization results were used to determine the optimum performance of the HAWT design using simulation. The optimal blades for HAWT were fabricated and their performance evaluated under real wind conditions. The linearization of the 45% twist and chord of elements 1 and 10 provided the best blade shape. Optimized twist and chord yielded HAWT performance with the Cp of 45% to 47% at rotational speeds of 200–900 rpm and wind speeds of 2–10 m/s. Twist and chord optimization increased the Cp from 39.71% to 46.43% with a rotational speed of 550 rpm at a wind speed of 6 m/s, as well as the maximum mechanical power from 424.28 watts to 500.35 watts at a wind speed of 10 m/s. The result from real wind conditions showed that manufactured HWAT produced an average electrical power of 294.19 watts at a rotational speed of 590.66 rpm. These results demonstrate that the optimized design approach presents a close match and is still reasonable in comparison to practical conditions.
Control and monitor bottle filling, capping and labelling machine using a programmable logic controller and human machine interface Kusumastuti, Sri; Pramesti, Aprilia Dian; Hartanto, Rico Sigit; Kartika, Vinda Setya; Rochmanto, Raditya Artha; Aji, Achmad Fahrul; Rizal, Aminuddin; Suryono, Suryono
Jurnal Polimesin Vol 22, No 5 (2024): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i5.5210

Abstract

Bottle filling, closing, and labellingmachine control and monitoring tool using Programmable Logic Controller (PLC) and Human-Machine Interface (HMI). This tool is designed to optimize the production process in the bottled beverage industry,with dimensions of 200 cm × 70 cm × 100 cm. The conveyor transports bottles through the filling, capping, and labeling units. In each unit, sensors are installed to detect the presence of bottles. Bottle liquid volume is determined through time settings inputted through the HMI,and the filling is performed by a water pump. After filling, bottles are capped and tightened mechanically using an air impact system. Labeling is handled by two DC motors which unroll the label and rotate the bottle, ensuringthe label adheres evenlyto all sides of the bottle. The number of bottles produced is calculated using a capacitive proximity sensor and displayed on the HMI. Testing results show that the system effectivelycontrols and monitors the bottle filling, capping, and labeling process viaPLC and HMI. Based on the test results on the bottle filling unit, the system can fill water into the bottle with a maximum percentage error of 0.5% on a 1000 ml volume bottle. In the capping unit, the success rate achieved is 70%, while the success rate in the bottle labeling unit is 80%.
Development of Portable Pico Hydro Power Plant for Low Head Applications Using Cross-Flow Turbine Budi Triyono; Dibyo Setiawan; Haryadi Haryadi; Vicky Wuwung; Zaki Odang; Norhafizan Ahmad
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.5833

Abstract

The purpose of this research is to develop a portable Pico Hydro Power Plant (PHPP) using a cross-flow turbine type utilizing a head of less than 3 m with a target output electric power of 20 W which is sufficient for lighting or charging laptops and smartphones for activities in remote areas. Previous research has resulted in a prototype of a portable PHPP with a cross-flow type, but because the prototype construction was made using a 3D printing process; many obstacles were still encountered during manufacturing, installation, and testing. The development carried out in this study includes changes to the turbine housing, nozzle, outlet, bearing housing placement, and turbine runner. The resulting PHPP has advantages in simplicity in the manufacturing process, installation, and operation. Based on experiments or tests carried out at a head of 2.3 m, it shows that the electrical output power had met the output target of 20.5 W with a turbine efficiency of 39.6%.
Material and process parameter optimization for dimensional accuracy in Fused Deposition Modeling 3D printing Rizqi Ilmal Yaqin; Juniawan Preston Siahaan; Mula Tumpu; Bagas Prakoso; Ade Hermawan; Febi Luthfiani; Barokah Barokah; Ahmad Kurniawan
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.5716

Abstract

The production of complex machine components requires advanced and accurate techniques. Achieving optimal quality through 3D printing involves carefully examining the process parameters. However, many studies have not thoroughly explored the impact of these parameters on parts produced using Fused Deposition Modeling (FDM) 3D printing. This study evaluates how process parameters and material variations affect the dimensional accuracy of printed parts. The study focuses on input variables such as material type, infill density, infill pattern, and raster angle. Using the fractional L9 Taguchi method, the optimal settings identified were PLA+ material, 80% infill density, an infill grid pattern, and a 0° raster angle, resulting in a 1.39%-dimensional deviation and an S/N ratio of -3.29 dB. ANOVA analysis reveals material type as the most significant factor, contributing 49.81% to performance. These findings, complemented by statistical analyses, can guide decision-making in industrial applications and serve as a reference for selecting FDM 3D printing settings related to dimensional accuracy to print components in the industry.
Experimental study on the performance of Peltier TEC12706 as a cooling and heating media Sujono Sujono; Hernawan Novianto
Jurnal Polimesin Vol 22, No 6 (2024): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i6.5345

Abstract

The application of refrigeration spans a wide range of industries, from household needs to the oil and gas sector, employing various cooling methods. One rapidly developing approach is the use of Peltier devices, particularly the TEC1 12706 model, due to its compact size and widespread availability. It is essential for students to understand the application of Peltier technology, which necessitates the creation of practical tools for both educational and research purposes. Most existing research on Peltier devices focuses on air conditioning systems with fixed loads; therefore, it is imperative to explore their cooling and heating effects in dynamic environments. To address this gap, this study investigates the performance of Peltier modules as cooling and heating systems for moving media. A prototype of a cooling and heating module (heat pump) was developed using Peltier devices, and its performance was evaluated by varying the flow rates of hot and cold water (1.62/1.02; 1.2/0.8; and 0.9/0.68 L/min) and the number of operational Peltier elements (2, 4, 6). Calculations using the relevant formulas yielded the Coefficients of Performance (COP): COPc = 0.45, COPh = 1.37, and COPtot = 1.82. The results revealed that the cooling performance coefficient is lower than both the heating and total performance coefficients. Additionally, variations in flow rates and the number of installed Peltier devices showed minimal impact on cooling and heating performance coefficients.

Page 39 of 51 | Total Record : 503

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