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Jurnal POLIMESIN

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Published by Politeknik Negeri Lhokseumawe

ISSN : 16935462 EISSN : 25491199 DOI : -

Automotive Engineering Control & Systems Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology

Jurnal POLIMESIN is an peer-reviewed journal that publishes original and high-quality research papers in all areas of mechanical engineering. The editorial team aims to publish high quality and highly applied research and innovation that has the potential to be widely disseminated, taking into consideration the potential mechanical engineering that it could generate. Jurnal Polimesin is publish twice a year in February and August.

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Articles 308 Documents

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Effect of Pressuring Time and Number of Holes on the Combustion Characteristics of Coconut Shell Char Briquettes Zahra Fona; Muhammad Hidayat; Adriana Adriana; Ummi Habibah; Muhammad Razi
Jurnal POLIMESIN Vol 20, No 1 (2022): February
Publisher : Politeknik Negeri Lhokseumawe

Briquettes have long been known as solid fuels that have particular specifications and uses. The briquettes utilization is very limited, mainly due to various obstacles, one of which is related to briquettes combustion. This study aims to determine the physical and combustion characteristics of briquette by comparing the effect of the pressuring time and the hole numbers of the briquette made of coconut shell biomass waste. Pre-dried coconut shell's raw material was carbonized in a closed vessel in less oxygen condition at a temperature of 450-500oC. Coconut shells char was then crushed and sieved to 60 mesh. The char powder was mixed with an amount of binder made of starch and stirred well to form a paste. Furthermore, the paste was put into a metal mold of 33 mm diameter, pressurized using a 160 kg.cm-2 hydraulic press for 30, 45, 60, and 75 seconds of holding time. The briquette products were then sun-dried and holed to 3 mm for 1, 2, and 3 holes for each briquette vertically. The product then analyzed for the density, compressive strength, ignition time, combustion duration, combustion rate, and thermal decomposition. The results showed that the density and compressive strength of briquettes were significantly influent by the hole numbers, which ranged from 0.834 -1.057 g.cm-3 of the density, and 47,7 - 50 kg.cm-2 of the compressive strength. The relaxations of the briquettes were in the range of 0,51 – 10,98%. The ignition time of the three holes briquette was 5.33 minutes, while the no-hole briquette was 7.47 minutes. The combustion duration of three holes briquette was 160 minutes, while 185 minutes for no hole briquette with the combustion rate of 0.116 g.min-1 and 0.120 g.min-1 respectively. Thermal decomposition analysis showed that the decomposition of biomass started at a temperature of 337oC and the weight lost up to 0.635 mg or 12.70%.

The influence of height on the spreading distance of axisymmetric jets impinging on a rigid surface Luthfi Luthfi
Jurnal POLIMESIN Vol 20, No 1 (2022): February
Publisher : Politeknik Negeri Lhokseumawe

The influence of the domain height of negative buoyancy jets when impinging on a rigid surface has been investigated. The study was conducted numerically by applying the Computational Fluid Dynamics (CFD) method. The numerical model consists of a set of Navier-Stokes equations together with an energy equation. The jet flow was modeled in a two-dimensional axisymmetric coordinate. The governing equations were solved in transient using the finite volume approach. The programming code for the numerical model was written in Fortran. The numerical simulations were run at Froude number Fr = 5.0; Reynolds number, Re = 200 and Prandtl number Pr = 7.0. The investigated parameter, the domain height was varied at around 8.8 ≤ H/X0 ≤ 10.2. The flow visualization created from simulation results has revealed the mystery behind the complex flow behavior in detail. Starting from the initial flow when the jet entered the domain to the complex flow pattern of the jet flow detaching from the top surface. Including when the downflow mixes with the upflow creating a recirculation area near the top surface and the bottom of the domain. The plot of the spreading distance over time shows that there is a maximum distance when the jet starts detaching from the top surface. Gradually, the distance decreases until reaching a fixed final distance when the jet flow reaches quasi-steady. The influence of the domain height that was investigated shows different flow patterns at different heights. The plot of final distances over the domain height shows that there is a nonlinear relationship. The regression equation created from the numerical data shows good agreement and accuracy.

Design of Natural Convection Solar Dryer for Coffee Beans with Monitoring System Based on Internet of Things Nurdin Nurdin; Irwin Syahri Cebro; Azhar Azhar; Hendrawati Hendrawati
Jurnal POLIMESIN Vol 20, No 1 (2022): February
Publisher : Politeknik Negeri Lhokseumawe

The process of monitoring the drying of coffee beans so far is still done traditionally so that the effectiveness of the drying process is still low. The IoT-based drying monitoring process is expected to provide better effectiveness and time efficiency. This research designs and manufactures a solar dryer with natural convection heat transfer for coffee beans equipped with an Internet of Things-based monitoring system. The purpose of this study is to develop the performance of a solar dryer with natural convection with the addition of an IoT-based monitoring unit. The research begins with a technical plan for the main components of the dryer. Components whose shapes, dimensions, and materials have been planned will be outlined in the form of detailed technical drawings. Detailed technical drawings will be a guide in the dryer manufacturing process. The main components of the dryer are solar collectors, drying chambers, and an IoT-based monitoring system. The solar collector will function to capture heat from the sun which will flow naturally into the drying room. An IoT-based monitoring system will capture the temperature and humidity (DFRobot DHT22 sensor) in the solar collector, drying room, and the environment of the dryer. In addition, a Bh1750 sensor to capture the intensity of the sun is also embedded in this monitoring system. This monitoring system will be connected to the internet network where the data will be sent to a cloud data server. The recorded data can then be downloaded using a mobile device or personal computer connected to the internet network. This IoT-based monitoring system was chosen so that performance data from the dryer can be monitored in real-time and online. The results of this study are a prototype dryer with a household capacity of 9 Kg equipped with an IoT-based monitoring system has been built and can be implemented properly

Optimization of the drilling campaign in reducing drilling cost in Block A Asset Ibnu Hafizh; Hasan Yudie Sastra; Irwansyah Irwansyah
Jurnal POLIMESIN Vol 20, No 1 (2022): February
Publisher : Politeknik Negeri Lhokseumawe

Drilling requires large costs with a very high risk of work, therefore good and careful planning is needed before it is carried out to obtain effective and efficient results by considering two aspects i.e. engineering and economics. Unstable conditions at the drilling site pose a high risk from the investor's point of view in terms of the total drilling costs that will be incurred in the area. The Platform drilling campaign implemented in Alur Siwah Phase 1 project is part of a project to increase gas recovery so that meets the gas raw materials demand in Aceh and the campaign is conducted using directional drilling technique. A descriptive method was used in the study and the data was gathered from the drilling activity reports during planning to post-drilling. Optimization using a drilling campaign during the drilling for the three wells in Alur Siwah Fase 1 resulted in a drilling cost savings of 26% and also saved execution time about 37 days from planning time

Synchronization of Treadmill Speed to Bicycle Model Speed Based on PID Controller Baskoro Latu Anurogo
Jurnal POLIMESIN Vol 20, No 2 (2022): August
Publisher : Politeknik Negeri Lhokseumawe

Bad weather and crowded vehicle lanes are often obstacles for cyclists during practice. Bicycle treadmills are the right solution to answer these demands. A person can cycle on a treadmill without having to leave the room. The rotation speed of the treadmill will be determined by the rotational speed of the bicycle wheels, so the bicycle will not fall off the treadmill. For this reason, this study aims to design a PID-based controller that will control the rotational speed of the treadmill so that it is in sync with the rotational speed of the bicycle wheel. The rotation of the bicycle wheel is represented by the wheel of a bicycle model that rotates on a treadmill, while the treadmill is represented by a model in the form of a conveyor. The results showed that in the first second, the conveyor speed was not the same as the speed of the bicycle model. Even so, after 1.5 seconds, the conveyor can catch up to the speed of the bike model. Despite some glitches, the conveyor can keep up with the speed of the bike model.

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

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.

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

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.

Simulation and Experimental Evaluation of Tensile Properties and Macrostructure Changed of 3D printer PLA Filaments Syaharuddin Rasyid; Rusdi Nur; Muas Muchtar
Jurnal POLIMESIN Vol 20, No 2 (2022): August
Publisher : Politeknik Negeri Lhokseumawe

The use of printing products with 3D printing has been widely used in everyday life, but research regarding its strength and performance is still limited. Therefore, simulation and experimental approaches are used in this paper to analyze the characteristics of PLA+ materials produced by 3D printers. a. Design tensile test specimens and static stress tests in Autodesk Fusion360; b. Calculate the weight of the tensile test specimen; c. Print tensile test specimens with variations in infill (60, 80, and 100%) and print direction (0, 45, and 90 deg); and d. Experiment with macrostructure, weight, and tensile tests. The conclusions of this study are; a. PLA+ material properties (macrostructure, weight, tensile strength, tensile strain) have been obtained experimentally and through simulation, b. The tensile strength of the simulated PLA+ material is higher than the experimental test results, c. The level of density (infill), affects the weight and tensile strength, and d. The direction of the impression affects the tensile strength, but weight and tensile strain have no effect.

Pengaruh Fraksi Volume Komposit Poliester Diperkuat Serat Rambut Manusia Dan Serabut Kelapa Terhadap Sifat Mekanik akbar anggoro putra
Jurnal POLIMESIN Vol 20, No 2 (2022): August
Publisher : Politeknik Negeri Lhokseumawe

Currently, composite applications range from the automotive, marine, and even aircraft sectors. One of the composites that have attracted a lot of attention from researchers is composites with natural fibers because natural fiber composites can be used as an alternative to synthetic or plastic materials. The low-density nature of natural fibers can provide good stiffness and strength as in fiberglass-reinforced composites. Coconut coir fiber and human hair waste are the basic materials for the manufacture of composites in this study. Because the amount is abundant so it is easy to obtain. The purpose of this study was to determine the effect of the variation of the best volume fraction of natural fiber composites with polyester matrix on the mechanical properties. The method used is hand layup with 3 variations of fiber volume fraction and polyester matrix, respectively 10:90, 15:85, and 20:80 and with the size of short hair fibers with a size of 3 cm and long coconut fibers with sizes according to the length of the print. The ratio of human hair fiber and coconut fiber is 1:1. Each fraction was tested 3 times to be more accurate. The results of the average tensile strength test with the largest ASTM D638 standard are at the volume fraction of 10:90 with a tensile strength of 19.2 MPa and the average impact test strength with the largest ISO 179-1 standard at the volume fraction of 20:80 is 17, 67 kJ/m². This study showed that the higher the fiber fraction in the composite, the lower the tensile strength but the higher the impact strength. Vice versa, the lower the fiber fraction in the composite, the tensile strength increases but the impact strength decreases.

An Uncertainty Analysis of Temperature Distribution on Loop Heat Pipe Prototype Nursinta Adi Wahanani; Mukhsinun Hadi Kusuma; Giarno Giarno; Afifa Pramesywari; Dedy Haryanto; Yoyok Dwi Setyo Pambudi
Jurnal POLIMESIN Vol 20, No 2 (2022): August
Publisher : Politeknik Negeri Lhokseumawe

To improve safety and normal operation aspects to be more economical, the NuScale type power reactor has the potential to be added passive cooling system technology. The technology is a loop heat pipe (LHP) with a wick made of a collection of capillary tubes. To determine the thermal performance of the LHP technology properly, the supporting analysis was needed before the experiment is carried out. One of the necessary supporting factors were to know the accuracy of measuring the temperature distribution on the LHP. The objective of this study was to determine the value of the uncertainty of the thermocouple used in the LHP experiment. By knowing the accuracy of the measurement of the temperature distribution, it is hoped that the resulting data is good and accurate. Data measurement was carried out using the National Instruments data acquisition system. The temperature distribution data retrieval was carried out under the condition that the LHP was in a steady state at the temperature of the hot water as the source of the LHP temperature of 35˚C, 45˚C, 55˚C, and 65˚C. Data collection was carried out within approximately 10 hours of the LHP experiment. The recorded temperature distribution data is then compared with temperature data using a well calibrated derived standard thermocouple. The calculation of the uncertainty value is carried out by statistical methods commonly used to determine the uncertainty of the temperature distribution measurement. The measurement results show that the average temperature value obtained is within the range of the standard uncertainty values of the thermocouple used. The uncertainty value obtained at all measurement points on variations in hot water temperature have value below the standard uncertainty value of the derived standard thermocouple used, which is 0.1°C. Based on these results, it can be concluded that the thermocouple used in the LHP experiment is feasible and has very good accuracy so that it can produce accurate and good LHP temperature distribution data.

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Azwinur

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