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MECHAFA PUBLISHER Jalan Kapten Yusuf, Lorong H. Yahya No.5. Desa Meunasah Mesjid, Kecamatan Muara Dua, Kota Lhokseumawe. Aceh. 24351
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Journal of Mechanical Engineering and Fabrication
Published by Mechafa Publisher
ISSN : -     EISSN : 30906598     DOI : -
Core Subject : Science, Engineering,
Control & Systems Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
The Journal of Mechanical Engineering and Fabrication (JMEF) is a scientific publication dedicated to advancing knowledge and innovation in the field of mechanical engineering and fabrication technology. JMEF accepts articles from various researchers who conduct research in the field of mechanical engineering and product fabrication, both research results of students, lecturers and other researchers. Each article will be processed with a review from reviewers who are members of JMEF. Focus and Scope The main scope of the journal is to publish original research articles in the area 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 with a special focus on Mechanical Engineering with scopes: - Energy Conversion JMEF accepts manuscripts written in the field of energy conversion with several limitations. Given the broad field of energy conversion, JMEF has limited the scope to mechanical and thermal energy conversion. Furthermore, the scope itself constrainted by several criteria. In more detail, JMEF only considers on study of the mechanical properties and design of conversion equipment to improve energy efficiency during the conversion process. Therefore, the topic of chemical processes and reactions that indirectly or directly affect the efficiency of thermal energy conversion is outside the scope of JMEF. - Machine and Mechanism Design - Manufacturing Technology - Material Engineering - Mechatronics - Biomechanics
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 20 Documents
 1   2 
Solar radiation monitoring system for electric vehicle charging using solar modules based on the Internet of Things Herlambang, Yusuf Dewantoro; Huda, Muhamad Nurul; Antoro, Daffa Yudha Akbar Putra; Ghozali, Hanif Faizal; Setyawan, Martando Robby; Apriandi, Nanang Apriandi; An-Nizhami, Avicenna; Yanuar, Padang; Riadini, Elfrida Rizky; Marliyati, Marliyati
Journal of Mechanical Engineering and Fabrication Vol. 2 No. 1 (2025): Maret
Publisher : Journal of Mechafa Engineering and Fabrication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64273/jmef.v2i1.17

Abstract

The utilization of solar energy to support electric vehicle charging still faces challenges related to efficiency and real-time solar radiation monitoring. Addressing this issue is critical given the importance of optimizing renewable energy to facilitate the transition toward sustainable transportation. This study offers a solution through the development of an Internet of Things (IoT)--based solar radiation monitoring system capable of measuring solar light intensity in real time. The system employs a BH1750 sensor integrated with an ESP32 microcontroller to process data, transmit it to the Firebase Realtime Database, and display it via an Android application. The methodology encompasses the design, implementation, and testing of the system on an electric vehicle placed in an open area for 10 hours of observation. Results indicate that the highest light intensity, recorded at 98,321 lux, corresponded to solar radiation of 776.74 W/m², while the lowest light intensity, 69 lux, resulted in radiation of 0.55 W/m². The implications of this research include enhanced efficiency in electric vehicle charging, the advancement of IoT-based solar energy systems, and the potential integration with energy storage technologies and predictive algorithms to improve energy sustainability.
The effect of torrefaction temperature variations on the characteristics and calorific value of water hyacinth charcoal briquette products Aris, M. Zainul; Yasir Amani, Yasir Amani
Journal of Mechanical Engineering and Fabrication Vol. 2 No. 1 (2025): Maret
Publisher : Journal of Mechafa Engineering and Fabrication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64273/jmef.v2i1.19

Abstract

Energy is needed by all people in various countries, this results in climate change and depletion of energy, it is necessary to find clean alternative energy, one of which is biomass. Water hyacinth is a biomass that grows rapidly in Indonesia, but its energy density is still low. This research aims to improve the characteristics and calorific value of water hyacinth biomass using torefaction process. In this study, water hyacinth was subjected to a torefaction process with temperature variations of 200 ℃, 250 ℃ and 300 ℃ and a holding time of 1 hour. ¬The biochar resulting from the torefaction process is then made into briquettes using tapioca starch adhesive, with a ratio of 10% of the weight of the raw material, and pressing at a pressure of 300 kg/cm2. From the research and testing that has been done, the proximate test results obtained the lowest moisture content of 5.75% in the 300 ℃ sample, the lowest ash content of 17.65% in the 200 ℃ sample, the lowest volatile compounds of 39.52% in the 300 ℃ sample and the highest fixed carbon of 25.92% in the 300 ℃ sample. The highest heating value was produced in the 300 ℃ sample which amounted to 5140.44 cal/g. The lowest Shatter Index was 1.68% in the 300 ℃ sample. The most optimal burning rate of briquettes in the 300 ℃ sample was 0.085 g/min with a duration of 47 minutes. The results of this study indicate that the torefaction process and torefaction temperature variation have a significant effect on the characteristics and heating value of water hyacinth briquettes.
Analysis of the effect of smaw welding current variation on the quality of AISI 1041 steel material joints Saifuddin, Saifuddin; Syahandra, Muhammad Arga; Azwinur, Azwinur
Journal of Mechanical Engineering and Fabrication Vol. 2 No. 1 (2025): Maret
Publisher : Journal of Mechafa Engineering and Fabrication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64273/jmef.v2i1.20

Abstract

This study analyzes the effect of E7018 electrode current variation on SMAW welding process on AISI 1041 steel material, using penetrant test and bending test as evaluation methods. AISI 1041 steel is often used in construction industry because of its good mechanical properties and its ability to be welded with various techniques. Testing was conducted with welding current variation of 100 A, 110 A, and 120 A. The test results showed that welding current significantly affected the strength and resistance of the material to deformation. At 110 A current, the material showed an optimal combination of strength and flexibility. Higher current (120 A) tended to increase the maximum stress in Root Pass test, but decreased the strength in Capping. This finding emphasizes the importance of selecting the right welding current in determining the strength of the welded joint, in addition to considering heat distribution and changes in material microstructure.
Design and fabrication a machine for chopping palm bunches for compost Yusuf, Ilyas; Hidayat, T Rian; Darmein, Darmein
Journal of Mechanical Engineering and Fabrication Vol. 2 No. 1 (2025): Maret
Publisher : Journal of Mechafa Engineering and Fabrication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64273/jmef.v2i1.21

Abstract

In the manual shredding process, the capacity is 50-70 kg/hour. Therefore, a crusher machine is needed to increase the capacity. The results of crushing the oil palm bunches can be used as compost. In this design, the cutting blade is designed with a larger number of cutting blades to accelerate the production of oil palm bunches so that it can operate optimally and does not require excessive power to move the tool because the tool designed will be driven using a gasoline engine and by adding cutting blades, the production capacity will increase. Design is one of the important things in making a program. The purpose of the design is to provide a clear and complete picture to the programmers and engineers involved. The design must be useful and easy to understand so that it is easy to use. Design is a process to define something that will be experienced in the process. The results of the machine test were able to produce a crushing capacity with a length of 3 - 14 cm, a width of 3 - 20 mm and ± 8.5 kg in one minute. The following is a systematic calculation of machine capacity: 1 minute = 8.5 kg per second 1 hour = 8.5 kg x 60 minutes = 510 kg/hour.
Analysis of the efficiency of production mobility between the use of diesel and electric forklifts at PT Ima Montaz Sejahtera Saifuddin, Saifuddin; Sufi, Richard Imam; Ariefin, Ariefin
Journal of Mechanical Engineering and Fabrication Vol. 2 No. 1 (2025): Maret
Publisher : Journal of Mechafa Engineering and Fabrication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64273/jmef.v2i1.22

Abstract

This study aims to analyze the efficiency of mobility in the distribution of production results by comparing the use of diesel forklifts and electric forklifts. Efficient mobility in the distribution process is an important factor to increase productivity and reduce operational costs. This study uses a quantitative method with a case study approach in a manufacturing company that utilizes both types of forklifts in its operational activities. The parameters analyzed include fuel or energy costs, operational time, load capacity, exhaust emissions, and maintenance and care costs. The results of the study show that electric forklifts have advantages in terms of lower energy costs and reduced exhaust emissions, but with the limitation of shorter operational time compared to diesel forklifts. Meanwhile, diesel forklifts have advantages in terms of longer operational durability but produce higher emissions and more expensive fuel costs. By considering efficiency and environmental impact factors, this study recommends the use of electric forklifts for production environments that require high mobility over short distances and diesel forklifts for long-distance or heavy-load applications that require longer operational times
Analysis of coal quality as fuel for steam power plants in Langkat Regency based on the proximate test Alfath Khoir Nst; Sayuthi, Muhammad; Amani, Yasir; Habibi, Muhammad; Faisal, Faisal; Hidayat, Heindrix
Journal of Mechanical Engineering and Fabrication Vol. 2 No. 2 (2025): September
Publisher : Journal of Mechafa Engineering and Fabrication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64273/jmef.v2i2.23

Abstract

Coal quality assessment is crucial for determining its suitability as a fuel for power generation and industrial applications. Such evaluation generally involves proximate and ultimate analyses. The proximate analysis provides information on moisture, volatile matter, fixed carbon, and ash content, whereas the ultimate analysis identifies elemental composition such as carbon, hydrogen, oxygen, nitrogen, and sulfur. Geological factors, including age, temperature, and pressure during formation, strongly influence coal quality. This study aims to evaluate the effect of particle size on coal quality using grain sizes of 40 and 60 mesh, analyzed according to ASTM standard procedures. The results indicate that coal with a grain size of 40 mesh contains, on average, 22.22% moisture, 5.83% ash, 37.54% volatile matter, and 34.15% fixed carbon. In contrast, coal with a grain size of 60 mesh exhibits 20.45% moisture, 6.80% ash, 42.77% volatile matter, and 29.99% fixed carbon. These findings highlight the significant influence of particle size on the proximate characteristics of coal, which can affect its combustion behavior and potential applications in power plants and other industries
Analysis of steam consumption in the crude palm oil sterilizer during a 90-minute boiling process Yasir Amani, Yasir Amani; Siregar, M. Ronny Syahputra; Faisal, Faisal; Hidayat, Heindrix
Journal of Mechanical Engineering and Fabrication Vol. 2 No. 2 (2025): September
Publisher : Journal of Mechafa Engineering and Fabrication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64273/jmef.v2i2.24

Abstract

In crude palm oil production, productivity largely depends on the performance of the sterilizer, particularly the horizontal type that operates using steam pressure. This study aimed to analyze the performance of the sterilizer by observing the boiling process of fresh fruit bunches (FFB) and determining the heat required during a single sterilization cycle. Observations were carried out throughout the sterilization process, with steam pressure monitored using the pressure gauge located on top of the sterilizer vessel. The daily steam requirement varied, with the highest recorded on the 10th day, reaching 1,050 kg of steam for 735 tons of FFB. Interestingly, a higher volume of FFB did not always correspond to a higher steam demand. On average, the sterilization process required 827 kg of steam per ton of FFB over 24 hours. At PT. Perkebunan Nusantara IV PKS Dolok Sinumbah, the horizontal sterilizer operates with a triple-peak system, a boiling time of 90–100 minutes, steam pressure of 2.8–3.2 kg/cm², and temperatures between 120–135 °C. The results indicate that the heat required reached 738,160.5 kcal/s, the latent heat was 7,772,760 kJ, and the total steam consumption amounted to 8,510,920.5 kcal for 30 tons of FFB.
Exergy analysis on a thermoelectric heat recovery device with an exhaust gas heat source from a combustion engine Sarwo Edhy Sofyan; Pratama, Yudha; Khairil, Khairil
Journal of Mechanical Engineering and Fabrication Vol. 2 No. 2 (2025): September
Publisher : Journal of Mechafa Engineering and Fabrication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64273/jmef.v2i2.25

Abstract

An internal combustion engine converts thermal energy into mechanical work with an efficiency of approximately 35–40%, depending on the engine type and operating conditions. This indicates that about 60–65% of the total energy is wasted, primarily in the form of heat loss through the cooling system, exhaust gases, and mechanical friction. One potential approach to improve engine efficiency is by recovering waste heat using a thermoelectric generator (TEG) system. This study aims to analyze the exergy performance of a thermoelectric heat recovery system that utilizes exhaust gas heat from an internal combustion engine as an energy source. The analysis focuses on the influence of engine speed variation and aluminum fin configuration on the exergy value, exergy destruction, and exergy efficiency to enhance waste heat utilization. The heat recovery system is connected to the exhaust pipe outlet, and several fin configurations are investigated: left–left-right, top–bottom, all-sided, and without fins. Tests were conducted at engine speeds of 1300, 1600, 1900, and 2200 rpm to observe variations in energy distribution and efficiency. The results indicate that the exergy value generated by the thermoelectric heat recovery system increases with higher engine speed. This finding demonstrates that the proposed system can effectively improve the thermal efficiency of internal combustion engines by converting exhaust heat into useful energy, contributing to overall energy savings and the development of more efficient energy conversion technologies.
Performance analysis of shell and tube type heat exchangers based on computational fluid dynamics (Case Study of Heat Exchangers at PT. XYZ) Zulfakri, Zulfakri; Lubis, Hasrin; Syukran, Syukran; Azwinur, Azwinur
Journal of Mechanical Engineering and Fabrication Vol. 2 No. 2 (2025): September
Publisher : Journal of Mechafa Engineering and Fabrication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64273/jmef.v2i2.26

Abstract

Shell and tube heat exchangers are essential components in the process industry, utilizing heat from exhaust gases to superheat steam in the production process. Their performance significantly determines the overall energy efficiency of the system. This study presents a case-based novelty by evaluating the actual performance of a shell and tube heat exchanger at PT. XYZ through Computational Fluid Dynamics (CFD) using Ansys Fluent 17.2. Simulations were conducted to analyze the distribution of temperature, pressure, and fluid velocity, as well as to calculate their effectiveness and LMTD. The simulation results show that the temperature of the cold fluid increases from 11.95°C to 19.35°C, while the temperature of the hot fluid decreases from 62.05°C to 49.55°C. The fluid pressure also decreases significantly, from 1717 Pa to -76.48 Pa on the tube side. The LMTD value is 40.09°C, and the heat transfer effectiveness is 24.95%. To ensure reliability, the simulation results were validated against actual operating data from PT. XYZ. This study contributes by providing a representative picture of the real operating performance of shell and tube heat exchangers, which can serve as a practical basis for improving system design and energy efficiency in the process industry.
Performance test of a parabolic reflector solar cooker in the Lhokseumawe Region Faisal, Faisal; Setiawan, Adi; Sayuthi, Muhammad; Suryadi, Suryadi; Syukri, Syukri
Journal of Mechanical Engineering and Fabrication Vol. 2 No. 2 (2025): September
Publisher : Journal of Mechafa Engineering and Fabrication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.64273/jmef.v2i2.27

Abstract

The utilization of solar energy as a renewable energy source is becoming increasingly important to reduce dependence on fossil fuels. One of its applications is the parabolic reflector solar cooker, which harnesses solar radiation for cooking purposes. This study aims to evaluate the performance of a solar cooker equipped with a parabolic reflector through a water heating test. The study presents an analysis of the performance of a solar cooker using a parabolic reflector collector. The solar reflector was constructed from mirror fragments arranged to form a parabolic shape with a surface area of 1.05 m². The experiment was conducted in the Lhokseumawe region, Aceh Province, Indonesia, located at coordinates 5°12’11.01’’ N and 97° E, with an altitude of 18.3 m above sea level. Performance measurements were carried out using a water heating method with a vessel containing 3.2 kg of water placed at the focal point of the reflector. The solar radiation received by the collector was reflected toward the focal point, heating the water directly. The results showed that the water temperature increased to 82.4 °C within 60 minutes, from 12:00 to 13:00 local time (WIB). The overall efficiency of the solar cooker was found to be 33.9%. These findings indicate that the parabolic reflector solar cooker has strong potential as an environmentally friendly alternative energy source suitable for application in tropical regions

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