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Jurnal Konversi Energi dan Manufaktur
Published by Universitas Negeri Jakarta
ISSN : 23392029     EISSN : 26225565     DOI : https://doi.org/10.21009/JKEM
Core Subject : Science, Engineering,
Aerospace Engineering Automotive Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
This journal aims as a medium for lecturers, researchers and practitioners to discuss result of their research in the field of mechanical engineering.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 175 Documents
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ANALISIS INDIKASI RESIKO POSTUR PENGGUNA DESAIN MEJA BELAJAR PORTABEL : Analysis of User Risk Posture Indication for Portable Study Desk Rohmatin, Yuyun Yuniar; Wahyuni, Rossi Septy; Raharja , Mei
Jurnal Konversi Energi dan Manufaktur Vol. 9 No. 1 (2024)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.9.1.1

Abstract

Study portable desks can help people easily move from one another place. Using a study portable desk would make users fix the position once a few moments so that they risk experiencing bodily discomfort. Analysis indications of posture risk can be done by selecting launch rapid upper limb assessment (RULA) analysis from the ergonomic tools toolbar in CATIA software. This research aims to identify movements that occur when using a portable study desk and to analyze user posture risks that can be experienced when using a portable study desk. Based on the research results, it is known that the body posture of portable study desk users for group A on the upper arms is in the range of 20-45°, and the lower arms are in the range of 60-100°. The wrist enters the neutral position range. The rotation of the wrist can be seen that the hand is pointing inward. It has a degree of freedom of 90° with a maximum flexion angle of 160° and a minimum extension angle of 0°. Group B body posture for the stem body has a degree of freedom of 0°. The legs experience a slight downward movement with a degree of freedom of 6.061° and a maximum flexion angle of 135°. Posture analysis results for body parts. Details of the upper arm, forearm, wrist, and wrist twist have a score of 1, which means no posture needs to be corrected and the posture is acceptable. Details of body parts, namely neck, trunk, and legs, are indicated in green, which means no posture needs to be corrected and the posture is acceptable. The score results for body parts with the static posture option get an assessment score of 2 with a green color indication, so it can be concluded that the risk indication for this posture is acceptable.
SISTEM RESIRKULASI AIR OTOMATIS UNTUK PENGHEMATAN AIR BERSIH DAN ENERGI PADA BUDIDAYA IKAN NILA: The Automatic Water Recirculation System for Clean Water and Energy Saving in Tilapia Farming Sukarno, Ragil; Ramadhan , Muhammad Fajar; Andriansyah, Farezi; Adigutama, Yudha; Syamsuir; Sampurno , Hari
Jurnal Konversi Energi dan Manufaktur Vol. 9 No. 1 (2024)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.9.1.5

Abstract

The acidity and turbidity of water are essential factors in tilapia farming, so it is necessary to control the acidity (pH) and turbidity (NTU) of water. This research aims to develop an automatic water recirculation system to save the use of clean water and energy consumption in tilapia fish farming using a microcontroller based on pH and turbidity (NTU) values. The research method used is experimental, starting with design and manfacture an Experimental apparatus in the form of a fish pond from a box-shaped tarpaulin, a filter system, a water circulation system consisting of pipes and a pump that has a suction power of 25 lpm, an Arduino-based microcontroller water quality controller. Tests were carried out by comparing water's pH and NTU values before and after filtering. The results showed that using a water recirculation system in a fish pond equipped with a filter system and an Arduino-based microcontroller system can significantly maintain the pH value and reduce the turbidity level (NTU). Using a recirculation system provides energy savings for pump consumption of 51.4% at a water flow rate of 15 lpm and 32.3% at a water flow rate of 25 lpm compared to conventional systems. Overall, the recirculation system provides the benefits of energy savings in pump operation, savings in water usage, and controlled water quality.
ANALISIS RUGI-RUGI HEAT RATE PLTU BANTEN 3 LONTAR AKIBAT DEVIASI PARAMETER PADA KONDISI AKTUAL MENGGUNAKAN ANALISIS GAP: Heat Rate Losses Analysis of Banten 3 Lontar PLTU due to Deviation Parameter on Actual Condition using Gap Analysis Wahyudi, Teguh; Yuriadi Kusuma
Jurnal Konversi Energi dan Manufaktur Vol. 9 No. 1 (2024)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.9.1.2

Abstract

Steam power plant (PLTU) is one type of energy conversion technology to generate electricity from fossil materials. The performance of a PLTU unit will begin to decline as the unit ages. In addition to age, performance degradation can also be caused by deviation of operating parameters, which can cause heat rate losses. The purpose of this study is to determine the performance of PLTU Banten 3 Lontar unit 2 by analyzing heat rate losses due to parameter deviations according to actual conditions and calculating cost savings and possible improvements. The research methodology used is an evaluation method where the actual data of operating parameters will be compared with the baseline data. The comparison will produce a deviation value, which is then used to obtain the value of heat loss, cost loss, and improvement recommendations for the plant. Baseline data is obtained from the interpolation equation of commissioning testing at 3 different variation loads. From the study, it is known that there was an increase in Nett Plant Heat Rate (NPHR) with an average of 561 kCal / kWh. The increase in NPHR occurred due to heat rate losses, where the decrease in turbine HP efficiency was the main cause, with an average loss of 87.96 kCal / kWh or 24.53% of total losses. Assuming that all heat rate losses during testing can be corrected, the average potential energy savings per day is 8,604,802 kCal/kWh, while the average cost savings are Rp1,534,046,000/month.
ANALISIS LAJU DEFORMASI PAHAT HSS PADA SIMULASI PEMBUBUTAN MESIN CNC DENGAN APLIKASI ANSYS : Analysis of HSS Tool Deformation Rate on CNC Machine Turning Simulation with ANSYS Application Widodo, Yakobus Rhio; Golwa, Gian Villany
Jurnal Konversi Energi dan Manufaktur Vol. 9 No. 1 (2024)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.9.1.7

Abstract

The demand to improve quality and productivity in the manufacturing industry underlies the analysis of tool deformation rates in the turning process. The methods used previously are considered inaccurate, and the provided information is incomplete. Therefore, detailed and accurate simulations are needed to determine deformation and strain values in HSS chisels. This study aims to obtain deformation and strain values on high speed steel (HSS) chisels in the process of turning ST42 steel workpieces using the finite element methods (FEM) method. The analysis was carried out using the ANSYS explicit dynamics application. This application aims to simulate complex physical phenomena by entering predetermined parameters, including diameter, spindle rotation, and workpiece and tool properties. HSS chisels are used in this simulation with ST42 steel workpieces. The variables in this study were the workpiece diameters of 30 mm, 40 mm, and 50 mm, with the same length of 200 mm. From the simulation results, it is evident that the maximum deformation value of the HSS tool on a diameter of 30 mm workpiece is 205.04 µm at a time step of 1.0 x 10-4 seconds. On a diameter of 40 mm workpiece, it is 205.19 µm at the same time step, and for a workpiece with a diameter of 50 mm, the tool deformation is 205.23 µm at the same time step. Additionally, the strain value on the HSS chisel with a workpiece diameter of 30 mm is 0.689 µm at a time step of 1.0 x 10-4 seconds. For a workpiece with a diameter of 40 mm, the strain is 0.783 µm at a time step of 1.0011 x 10-4 seconds, and on a workpiece with a diameter of 50 mm, the final strain on the tool is 0.866 µm at a time step of 1.0 x10-4 seconds.
ANALISIS LAJU DEFORMASI PAHAT CARBIDE PADA SIMULASI PEMBUBUTAN BAJA ST41 DENGAN MESIN BUBUT KONVENSIONAL MENGGUNAKAN SOFTWARE ANSYS: Analysis of Carbide Tool Deformation Rate in Simulation of ST41 Steel Turning with Conventional Lathe using ANSYS Software Ulin Nuha; Golwa, Gian Villany
Jurnal Konversi Energi dan Manufaktur Vol. 9 No. 1 (2024)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.9.1.8

Abstract

In the machining process, knowledge of the tool and workpiece is required to achieve maximum results between quality and productivity. Tool wear parameters are very important to know because the process of changing or sharpening the tool can be predicted. One thing that influences the tool wear rate is the friction force between the tool and the workpiece. This frictional force will produce vibrations and heat energy, causing the chisel grains to erode so that they will experience wear within certain standards. This research aims to analyze the wear value of carbide-type tool edges in the ST41 material turning process based on the friction force that occurs between the tool and the workpiece. Then, from the wear value, the recommended cutting speed is. The method used is simulation-based research using ANSYS software, especially ANSYS Mechanical, by entering predetermined parameters, including diameter and spindle rotation. From the simulation results, the total deformation of workpieces with diameters of 25 mm, 35 mm and 45 mm is 0.363 μm, 0.155 μm and 0.152 μm, respectively. It can be concluded from the simulation results that the largest total deformation is at a diameter of 25 mm.
RANCANGAN PROTOTIPE MESIN PENGERING GABAH BERBASIS TEKNOLOGI HYBRID: Prototype Design of Grain Dryer Machine Based on Hybrid Technology Prasetyo, Andre Ryan; Sulis Yulianto; Edi Widodo
Jurnal Konversi Energi dan Manufaktur Vol. 9 No. 1 (2024)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.9.1.4

Abstract

Until now, the process of processing paddy into rice still relies heavily on the traditional and commonly used methods. During the drying stage, the harvested rice grains are spread out and sun dried. To address this issue, an effective solution is needed to enhance the quality of of rice seeds. Therefore, a post harvest rice handling technology is being developed with a hybrid technology based grain drying tool, where solar energy is still harnessed through photovoltaic solar panels (PLTS). The purpose of this research is to design, develop, and test a prototype grain drying machine abased on hybrid PLTS technology. The research focuses on calculating the power drying, and evaluating the PLTS system. The methods used include testing grain drying with variations in temperatures of 45ºC, 50ºC, dan 51ºC , as well as a grain weight of 8 kg. the greatest energy consumption during drying is directed towards the PLTS battery system, and calculations are performed to determine the duration of battery usage. The research findings reveal drying efficiencies of 9.7%, 12.8%, and 13.12% and final mouisture contents of 16.3%, 14.6% and 14.1 % at temperatures of 45ºC, 50ºC, and 51ºC respectively. The optimal drying times are 2 hours at 45ºC and 50ºC, and 1.5 hours at 51ºC. the battery usage time with a power of 209 W is 2.3 hours.
COVER AND PREFACE JURNAL KONVERSI ENERGI DAN MANUFAKTUR VOL. 9 NO. 1 (2024) Jurnal Konversi Energi dan Manufaktur Editor's
Jurnal Konversi Energi dan Manufaktur Vol. 9 No. 1 (2024)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

SUMMARY. Rohmatin et al., in their paper, identified the movements that occur when using a portable study table and analyzed indications of user posture risks that could be experienced when utilizing a portable study table. Wahyudi and Kusuma, in their paper, analyze heat rate losses due to parameter deviations according to actual conditions and calculate cost savings and possible improvements to determine the performance of PLTU Banten 3 Lontar unit 2. Medikano et al., in their paper, innovate the wrench to simplify the machine maintenance process. Prasetyo et al., in their report, designed, developed, and tested a prototype of a grain drying machine based on hybrid PLTS technology. This research focuses on drying machine power calculations, thermal analysis, grain drying efficiency, and evaluation of PLTS systems. Sukarno et al., in their paper, developed an automatic water recirculation system to save clean water use and energy consumption in tilapia cultivation using a microcontroller based on pH and turbidity values ​​(NTU). Wijianto and Alfitrah, in their paper, simulated the fluid flow in this downdraft-type gasification installation to determine the influence of heat distribution or temperature in the gasification equipment installation and the effect of the mass flow rate of cooling water on the airflow out of the reactor. Widodo and Golwa, in their paper, carried out an analysis using finite element methods (FEM) to simulate complex physical phenomena to obtain deformation and strain values ​​for HSS chisels in the turning process with ST42 steel workpieces. Nuha and Golwa, in their paper, analyzed the wear value of carbide-type tool edges in the ST41 material turning process based on the friction force between the tool and the workpiece.
ANALISIS KECEPATAN KELUARAN ANGIN KONDENSOR AC TERHADAP JENIS–JENIS BLADE GENERATOR LISTRIK DENGAN KOMPUTASI FLUIDA DINAMIK: Analysis of AC Condensor Wind Output Speed to Types of Electric Blade Generator with Computational Fluid Dynamics Wahid Wahyu Saputro; Golwa, Gian Villany
Jurnal Konversi Energi dan Manufaktur Vol. 9 No. 2 (2024)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.9.2.1

Abstract

Electrical energy is widely used for household and industrial purposes, so the need for electrical energy will continue to increase every year. Therefore, it is necessary to develop an electrical energy generation system that comes from renewable energy such as wind. Currently, not much is known about the use of wasted wind from air conditioner (AC) condensers. The blow of wind can be used to produce electrical energy, so it is necessary to make wind-powered electric generator blades from the condenser output. The blade that will be designed is a three-blade model, so it is hoped that it can rotate the generator optimally. The purpose of this research is to design a three-blade type that can optimize the rotation of the electric motor/generator and get the maximum number of revolutions with a three-blade design because this design provides better stability and more efficiency. One way of making the design is to make simulation variations with computational fluid dynamics (CFD) in order to find out the right blade design to rotate the generator and find out the wind blowing from the air conditioner (AC) condenser that crosses the blade. In this study, three simulations were carried out to get maximum results, namely 390 rpm at 42 °C with a velocity of 10.7 m/s and a pressure of 34.4 Pa. To be able to determine the effectiveness of the AC condenser wind output speed with a three-blade design.
PENGARUH TITANIUM DALAM LAPISAN LAS TERHADAP STRUKTUR MAKRO-MIKRO, KEKERASAN, DAN LAJU KOROSI: Titanium Effect in Weld Layer on The Macro-microstructure, Hardness, and Corrosion Rate Sopiyan; Syaripuddin; Muhammad Hafidz Fatahillah; Muhammad Fauzan Perdana Putra; Muhammad Yunan Hasbi
Jurnal Konversi Energi dan Manufaktur Vol. 9 No. 2 (2024)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.9.2.2

Abstract

Low carbon steel cannot be hardened because of its low carbon content. Therefore, a hardfacing process is carried out to increase hardness. Apart from increasing hardness, the benefits of hardfacing can increase wear and corrosion resistance. The hardfacing process using the shielded metal arc welding (SMAW) process generally uses commercial electrodes. Therefore, it is necessary to add other elements such as titanium (Ti) to the weld layer to further increase its hardness. This research aims to study the influences of Titanium (Ti) addition in welding layers that were welded using HV 600 to micro and macrostructure, hardness, and corrosion rate. The hardfacing was conducted using the SMAW process with the various addition of Ti (0.115, 0.223, and 0.334 g) and cooled at room temperature. Macrostructure and microstructure were investigated using digital cameras and an optical microscope. Hardness and corrosion rate were investigated using the Vickers hardness test and weigh loss method. Based on macrostructure investigation, there is a perfect fusion between base metal and weld metal. The microstructure formed is a austenite, martensite and carbide phase. The lowest corrosion rate of 17.54 mpy was seen in the Ti1 sample. The lowest Ti addition would resulting higher hardness at 761.06 VHN.
ANALISIS HASIL CETAKAN MATERIAL POLYPROPYLEN BENTUK BOTOL MENGGUNAKAN METODE INJECTION BLOW MOLDING: Analysis of Bottle Shaped Polypropylene Material Mold Results using The Injection Blow Molding Method Sugiyanto, Didik; Wicaksono, Enggar Darmawan; Daryus, Asyari
Jurnal Konversi Energi dan Manufaktur Vol. 9 No. 2 (2024)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.9.2.4

Abstract

The process of forming materials is often carried out in the manufacturing industry, especially in the process of forming plastic materials. One method is the injection blow molding, which is done by blowing air into a mold that has been previously designed. The need for a level of precision and accuracy in designing a mold using the injection molding process is one of the important things in the injection blow molding process. One of the designs that must be considered when printing a bottle-shaped product is that it must be precise, in accordance with the expected product design, by considering machine and mold design, material selection, molding materials, and manufacturing processes. The aim of the research is to determine the influence of temperature and pressure on thickness and shrinkage in molds with 30 ml bottle shape. From the results of tests that have been carried out, the effect of a pressure of 4 bar and a temperature of 160 °C produces an average thickness of the mold of 1.03 mm, while at a pressure of 4 bar and temperature of 180 °C the average thickness is 1 mm. The standard used for bottle products is less than 1 mm so that the pressure 4 bar from the experimental results meets the standards for injection blow molding process mold results and for shrinkage occurs at 0.681 %.

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