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Radissa Dzaky Issafira
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Department of Mechanical Engineering, Faculty of Engineering, Universitas Pembangunan Nasional Veteran Jawa Timur 1st floor Giri Reka Building, East Java, Indonesia Jl. Raya Rungkut Madya, Gunung Anyar Surabaya Jawa Timur 60294 Indonesia
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Biomedical and Mechanical Engineering Journal
Published by Universitas Pembangunan Nasional Veteran Jawa Timur
ISSN : -     EISSN : 27761983     DOI : -
Core Subject : Science, Engineering,
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation
The Biomej Journal is published by the Mechanical Engineering Study Program, Faculty of Engineering, East Java "Veteran" University, Surabaya-Indonesia. Biomej is an open-access peer review journal that mediates the dissemination of academics, researchers, and practitioners in the field of mechanical engineering and accepts journal publications from all over Indonesia. Biomej aims to provide a forum for national and international academics, researchers and mechanical engineering practitioners to publish original articles. All accepted articles will be published and will be freely available to all readers with wide visibility. The scope of the Biomej Journal is including widely topics in engineering such as: 1. Biomedical engineering 2. Tribology 3. Modelling 4. Finite ELement Method 5. Material Science 6. Mechatronics 7. Structural and Machiine Design 8. Stress Analysis 9. Renewable Energy 10. Structural Mechanics 11. Thermodynamics 12. Material Processing 13. Fatigue and Air Conditioning 14. Heat Transfer 15. Manufacturing 16. Fluid Mechanics 17. Combustion 18. Aeodynamics 19. Environmental Protection 20. Acoustic and Noise 21. Energy Studies 22. Refrigerationand Air 23. Conditioning 24. Engines and Turbines 25. Thermodynamics 26. Earth Science 27. Natural Hazards 28. Food Technology Processing
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 90 Documents
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Temperature and Coefficient of Performance Test for Cooling Machine Wahyu Aditya Sp; AS Mukti; RF Aditama; RMZH Putra; WAS Putra; RR Hidayat; MN Ardhany; MW Rosyadi; RDK Mahameru
BIOMEJ Vol. 4 No. 1 (2024): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/biomej.v4i1.100

Abstract

A cooling machine is a mechanism in the form of a cycle that takes energy (thermal) from a low temperature area and discharges it to a high temperature area (environment), so that the cooling load greatly influences the performance of the cooling machine. The greater the cooling load being cooled, the greater the cooling engine power will be required. Likewise, the smaller the cooling load, the smaller the cooling engine power required. The method used in this experiment is a quantitative method where we collect data and then process the data to get the Coefficient of Performance (COP) value. Based on the observations from the data collection results, it was found that in the 5th minute to the 30th minute there was a decrease in temperature, where the room temperature in the cooling machine was initially 24°C and the temperature decrease began to occur in the measurement at the 5th minute, amounting to 20.5° C, at the 10th minute it was 20.42°C, at the 15th minute it was 19.04°C, at the 20th minute it was 18.06°C, at the 25th minute it was 17.94°C, and at the 30th minute it was 17.82°C. From the actual COP data, in minutes 5 to 10 there was a decrease in temperature of 0.46%, where this percentage shows that there has not been a significant decrease in temperature, where a fairly high decrease occurred in the 15th to 20 minutes, where the percentages are consecutive. -also shows 7.95% and 5.64%. From the 25th to the 30th minute, the rate of decline began to remain constant again with a percentage of only 0.69%.
A Performance of Baffled Stirred Tank Reactor in Map Mineral Recovery Luluk Edahwati; Sutiyono; Suprihatin
BIOMEJ Vol. 4 No. 1 (2024): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/biomej.v4i1.101

Abstract

In the agricultural and wastewater treatment industries, the formation of Magnesium Ammonium Phosphate (MAP), also known as struvite, is an important process to utilize organic waste and produce value-added phosphate fertilizers. In this context, the use of a stirred tank reactor equipped with baffles is a major concern. This study aims to evaluate the performance of a stirred tank reactor with baffles in the recovery of MAP. Analysis of the experimental results shows that the use of baffles has a significant impact on process efficiency and the quality of the MAP product produced. This study provides a deeper understanding of the role of baffles in maintaining the flow pattern and mixing of raw materials in the reactor tank, thus making an important contribution to the development of more efficient and environmentally friendly phosphate fertilizer manufacturing technology. best phosphate obtained 27%, ph 10, temperature 30oC and molar ratio 1:1:2 Keywords: molar ratio, pH, precipitation, RTB, temperature, struvite
Miniature Design of 3D Printed Piston Cup Using PLA Filament Material in Manufactoring Process G. A. PUTERO; M. Viqri; F. Risman; A.G. Dewantara
BIOMEJ Vol. 4 No. 1 (2024): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/biomej.v4i1.103

Abstract

The manufacturing process has evolved throughout the years, with the current existence of 3D printing methods revolutionizing the industry. In the world of manufacturing, 3D printing is essential for producing unique products through a computerized system that synchronizes with many parameters of the intended 3D printed product. The precision of the systems used in 3D printing eases the manufacturing process by displaying parameters of a product that can be thoroughly analyzed. Furthermore, the 3D printing computerized system is effective, energy-efficient, and reliable due to not having direct human involvement in the manufacturing process, thus reducing the percentage of human errors. CAD designs are used for 3D printing and can produce highly accurate 3D printed objects. Mechanical components, small objects, and CAD-accurate designs can easily be achieved through 3D printing. Additionally, 3D printing allows for the creation of miniatures with highly accurate reproductions, which is particularly valuable in industries such as aerospace, medical devices, and consumer electronics. These miniature creations can be manufactured with intricate details that were previously difficult or impossible to achieve with traditional methods. The capability to produce these detailed miniatures has opened new avenues for innovation and customization in manufacturing. Due to the many advantages and the high level of precision offered by 3D printing, many researchers are driven to continuously improve the technology. Advances in materials, printing speed, and resolution are continually being explored to expand the applications of 3D printing in various sectors. The potential for producing complex geometries and custom components on demand makes 3D printing a pivotal technology in the future of manufacturing.
Cooling Machines and Coefficient of Performance Calculations in Refrigeration Systems Safitri, Puspa Dinda; A. Hidayat; H A Geralfine; D.Y Nugraha; N. A Tasya; F.H.R Nurrokhim; I.A. Fayrezzi; I. Habibullah; W. Saputro; R.D. Issafira
BIOMEJ Vol. 4 No. 1 (2024): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/biomej.v4i1.113

Abstract

A cooling machine is an energy conversion machine that is used to transfer heat from a high temperature hot reservoir to a higher temperature hot reservoir by adding work from outside. In clear terms, a cooling machine is equipment used in the process of cooling a material (fluid) so that it reaches the desired temperature and humidity, by absorbing heat from the material (fluid) that will be conditioned, or in other words absorbing heat (heat) from a cold reservoir. and given to the hot reservoir. The method used in this experiment is a quantitative method where we collect data and then process the data to get the Coefficient of Performance (COP) value. the average temperature in the 5th minute was 24.7 ˚C, in the 10th minute it was 22.34 ˚C, in the 15th minute it was 21.66 ˚C, in the 20th minute it was 21.42 ˚C, at the 25th minute it was 21.32 ˚C, and at the 30th minute it was 21.2 ˚C. COPmax data above the 5th minute to the 10th minute there is a temperature decrease of 5.74%, where the temperature decrease is the highest temperature speed decrease compared to other minutes because the series of tools working in the first 5 minutes has a temperature decrease speed of the minute temperature. 5th minute of 24.7 ˚C towards the 10th minute average temperature of 22.34 ˚C. Meanwhile, the decrease in temperature from the 10th minute to the 15th minute was 2.95%. From the 15th minute to the 20th minute temperature, there was a decrease of 2.82%. For the temperature from the 20th minute to the 25th minute, the temperature decreased by 2.77%. Then from the 25th minute to the 30th minute, the temperature decreased by 2.71%. COPactual data calculations also showed a decrease where in the 5th minute it was 0.75%, in the 10th minute 0.33%, in the 15th minute 0.09%, in the 20th minute 0.03%, while in the 25th and 30th minutes the temperature starts constant with a decrease of 0.01%
Analysis of Efficiency and Heat Transfer Coefficient in the Performance Evaluation of Shell and Tube Heat Exchanger Chalimah , S; Maulana , I; Setyobudi, R; Sandrina, A; Anggoro , R B; Buana , E S; Kartiko, M A; Alhalim, MA
BIOMEJ Vol. 4 No. 2 (2024): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/biomej.v4i2.129

Abstract

Heat transfer is the process of energy transfer from a region of higher temperature to a region of lower temperature, occurring through conduction, convection, and radiation mechanisms. Understanding heat transfer is crucial in various industrial and thermodynamic applications. One commonly used device in this process is the heat exchanger, which allows heat transfer between two fluids with different temperatures without direct mixing. This research aims to evaluate the heat transfer phenomena in heat exchangers and their performance under various operational conditions. The study measured the average temperature difference, kinematic viscosity, Reynolds number, fluid velocity, heat exchanger efficiency, the average heat released and received, and the heat transfer coefficient. The results showed a high heat exchanger efficiency, with an average value of 99.53%. The heat transfer coefficient also showed significant values, varying based on fluid flow type and operational conditions. This study emphasizes the importance of selecting the appropriate type and design of heat exchanger to improve thermal system efficiency and reduce energy consumption.
Coefficient Analysis of Shell and Tube Type Heat Exchangers Hafizh, Firmansyah; Suares, Reza Mardiansah; Ikhsanudin, Zaky; Safitri, Puspa Dinda; Ghozali, Achmad Imam; DwiYanto, Agus; Firmansah, Achmad Robi; Rujianto, Andi Azrial Akbar; Saputro, Wiliandi; Issafira, Radissa Dzaky
BIOMEJ Vol. 4 No. 2 (2024): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/biomej.v4i2.133

Abstract

Heat exchanger is a device used to transfer heat between two fluid systems at different temperatures. In this research, the heat exchanger used is in the form of a shell and tube which studies the mechanism of heat transfer between hot water and cold water both in contra flow. The purpose of this research is to analyze the relationship of heat transfer coefficient with changes in flow regime in shell and tube contra flow heat exchanger. This research was carried out by measuring the inlet and outlet water temperatures for the counter flow configuration, then analyzing the effectiveness calculation using the LMTD method. As a result, the inlet and outlet water temperature values for the counter flow configuration are obtained, then the effectiveness of the heat exchanger is assessed using the LMTD formula where the effectiveness of the heat exchanger for counter flow. The purpose of the research is to understand the heat exchanger system and analyze the performance of the shell and tube heat exchanger.
Data Retrieval on Heat Exchange Machines Geralfine, Hilza Arrun; Mahmudah, Imam; Perdana, Rizky Ridho; Naufal, Ananda; Hermaputra, Virendra Maulana; Bagindo, Fikran Azizi; Witjaksono, Yoga Aiman; Saputro , W
BIOMEJ Vol. 4 No. 2 (2024): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/biomej.v4i2.134

Abstract

In many industrial processes, heat transfer—the movement of thermal energy from one object or medium to another—is a significant phenomena. Conduction, convection, and radiation are the three primary mechanisms via which this phenomena happens. When a temperature gradient causes heat to go from a hotter to a cooler region in a solid substance, this process is known as conduction. Heat is transferred through a moving fluid (liquid or gas) by convection, which can occur spontaneously as a result of density differences or be induced mechanically by a pump or fan. Unlike the other two methods, radiation includes the movement of energy in the form of electromagnetic waves and does not require a medium.
Analysis Effect of Light Intensity on Efficiency of the GH 100 WP-72 Solar Cell Ferdi Kurniawan; Michael Dion Lisanto; Marselinus Angga Setyo Atmojo; Muhammad Hendra Budi Satria; Nellysa Arviana Tasya; Muhammad Iqbal Habibullah; Alvin Muhammad; Radissa Dzaky Issafira
BIOMEJ Vol. 4 No. 2 (2024): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/biomej.v4i2.136

Abstract

Energy is the main need today, with fossil energy sources increasingly depleting. Therefore, the development of renewable energy, such as solar energy, is very important. This article discusses the efficiency produced by solar cells in research conducted at the Energy Conversion Laboratory of the National Development University "Veteran" East Java. Solar cells are devices that convert solar energy into electrical energy through photovoltaic effects, without producing pollution or greenhouse gases, so they are an environmentally friendly energy source. Data was taken at 10.00-10.30, by measuring battery and solar panel voltage, battery charging current, and solar panel temperature. The experimental method was used by collecting data three times every 15 minutes for 30 minutes. The solar panel used is GH solar type GH 100 WP-72. Efficiency is calculated based on input and output power, with the highest efficiency achieved when the battery is full. The results show the lowest efficiency of 3.67% at 10.40 with a light intensity of 313.24 W/m² and the highest efficiency between 20.76% to 23.52% at 13.20-13.50 with a light intensity of 255.64 W/m² to 289. 61 W/m². Solar cell efficiency is greatly influenced by battery condition and light intensity.
Implementation of Decision Support System Techniques in Evaluating IoT-Based Anthropometric Devices for Stunting Prevention in Toddlers Eni Safriana; Farika T Putri; Ragil T Indrawati; Wahyu I Nugroho; Mella K Sari; Anoeng Prasetyo; Arhama Insani; Muryanto
BIOMEJ Vol. 5 No. 1 (2025): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/biomej.v5i1.146

Abstract

Stunting remains a significant national health issue in Indonesia, prompting the government to focus on its prevention through regular monitoring of child growth. This study aimed to determine the preferred IoT-based anthropometric measuring device for toddlers using Decision Support System (DSS) methods, specifically Analytic Hierarchy Process (AHP), Weighted Product (WP), and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). Two products, Product A and Product B, were evaluated based on criteria including accuracy, ease of use, durability, connectivity, and cost. The AHP method was used to determine the criteria weights, followed by the application of WP and TOPSIS to rank the products. The results indicated that Product A was consistently preferred, demonstrating superior performance in accuracy testing with an average accuracy of 98.76% for height and 99.21% for weight measurements, compared to Product B’s 95.42% and 96.85%, respectively. These findings validate the effectiveness of the DSS methods used, providing a reliable approach for selecting IoT-based healthcare devices. This study offers a practical decision-making framework for Posyandu and other healthcare facilities to ensure accurate and efficient child growth monitoring.
Finite Element Analysis of Static Failure in a Tempered and Hardened 1040 Steel Shaft Ruviana, R; A N Izzah; M R Firdaus; S T Darmawan; K F Nugroho; W Illaahiyah; I Y Pratama
BIOMEJ Vol. 5 No. 1 (2025): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33005/biomej.v5i1.151

Abstract

This study investigates the static load failure behavior of a shaft made from tempered and hardened AISI 1040 carbon steel using both analytical calculations and numerical simulations. The shaft, with a diameter of 30 mm and length of 350 mm, was subjected to a vertical force of 800 N and torsional moments of 190 Nm and 50 Nm at different ends. Mechanical properties of the material, including a yield strength of 659.10 MPa and ultimate strength of 892.70 MPa, were used to support stress analysis. Analytical methods based on classical mechanics were applied to calculate bending stress, shear stress, von Mises stress, and safety factors. These were then validated through finite element simulation using ANSYS Static Structural. Results showed that the maximum von Mises stress from simulation was 51.5 MPa, significantly below the material's yield strength, while the analytical calculation gave 71.7 MPa. The maximum shear stress was 26.2 MPa in the simulation versus 35.9 MPa analytically. Total deformation reached 0.546 mm in simulation, and 0.0848 mm from manual calculation. The equivalent elastic strain was also within elastic limits in both methods. The safety factor was 12.789 from simulation and 9.27 from manual calculation, indicating a highly safe design. Additionally, the fatigue life analysis revealed the shaft could withstand up to 100 million load cycles without failure. These findings confirm that the shaft remains structurally and functionally safe under the given static and cyclic load conditions.

Page 9 of 9 | Total Record : 90

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