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Borobudur Engineering Review
Published by Universitas Muhammadiyah Magelang
ISSN : -     EISSN : 27770850     DOI : https://10.31603/benr
Core Subject : Engineering,
Automotive Engineering Engineering Mechanical Engineering
Aims BENR is a research journal in the field of engineering published by the University of Muhammadiyah Magelang. The journal is published twice a year and provides a forum for publishing original research articles, review articles, and case studies on its scope. This journal is a tool for researchers, academics, and practitioners who want to share their thoughts and findings. Scope BENR is a journal that has a scope of studies in industrial engineering, supply chain management, ergonomy, green industry, mechanical engineering, tribology, electronic engineering, automation systems, robotics, mechatronics and materials engineering.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 55 Documents
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Python-Based Heat Transfer Modeling for Charcoal Kiln Optimization Adeniran, Adegbola David; Oyelami, Seun; Okedere, Oyetunji; Adeboye, Busayo; Oyewo, Abideen
Borobudur Engineering Review Vol. 6 No. 1 (2026): Advanced Industry
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/160b7z68

Abstract

This study presents a Python-based multiphysics framework for modeling and optimizing heat transfer in insulated metallic charcoal kilns, targeting improved thermal efficiency, reduced processing time, and enhanced charcoal yield. The model couples transient heat conduction, convective–radiative losses, moisture evaporation, and biomass pyrolysis kinetics, solved using finite-difference schemes and validated against pilot-scale kiln measurements. Model predictions achieved temperature deviations below 8 °C above 200 °C and charcoal yield errors within 5% of experimental values. A multi-objective optimization using NSGA-II identified optimal kiln configurations that increased thermal efficiency from 42.5% to 67.3%, reduced carbonization time by 28–35%, and improved charcoal yield to 32–35% compared with conventional designs. Sensitivity analysis showed insulation thickness and heating rate to be the dominant design variables, while excessive insulation yielded diminishing returns. Compared with recent kiln and rotary-reactor studies, the proposed Python framework offers superior transparency, flexibility, and computational efficiency. The results demonstrate that open-source numerical tools can provide a cost-effective pathway toward cleaner, energy-efficient charcoal production, supporting sustainable biomass utilization in developing economies. Keywords: Heat-transfer; Wood; Pyrolysis; Charcoal-kiln; Modelling.
Studi Eksperimen Pengaruh Variasi Densitas Spons sebagai Cooling Pad terhadap Kinerja Sistem Evaporative Cooling: Experimental Study of the Effect of Sponge Density Variations as a Cooling Pad on the Performance of an Evaporative Cooling System Purnomo, Bagiyo Condro
Borobudur Engineering Review Vol. 6 No. 1 (2026): Advanced Industry
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/35q99e68

Abstract

Performa sistem evaporative cooling sangat dipengaruhi oleh karakteristik cooling pad, terutama kemampuan media dalam menyerap, mendistribusikan, dan mempertahankan air selama proses evaporasi. Penelitian ini bertujuan untuk menganalisis pengaruh densitas cooling pad berbahan spons terhadap performa sistem evaporative cooling dengan mekanisme pembasahan pasif melalui kapilaritas tanpa menggunakan pompa sirkulasi air. Variasi densitas spons yang digunakan adalah 0,0215 g/cm³, 0,0225 g/cm³, dan 0,0233 g/cm³, sedangkan kecepatan udara divariasikan sebesar 4 m/s dan 5 m/s. Parameter yang diamati meliputi temperatur udara masuk dan keluar, kelembaban relatif masuk dan keluar, laju penguapan air, cooling effect, perubahan kelembaban relatif (ΔRH), dan effectiveness evaporative cooling. Hasil penelitian menunjukkan bahwa densitas cooling pad memberikan pengaruh yang signifikan terhadap performa sistem. Densitas 0,0225 g/cm³ menghasilkan cooling effect tertinggi, peningkatan kelembaban relatif yang lebih stabil, serta effectiveness evaporative cooling terbaik dibandingkan variasi densitas lainnya. Hal ini menunjukkan bahwa densitas tersebut mampu memberikan keseimbangan antara gaya kapiler, retensi air, permeabilitas media, dan hambatan aliran udara sehingga proses perpindahan panas dan massa berlangsung lebih efektif. Sebaliknya, densitas yang terlalu rendah menyebabkan kemampuan retensi air menurun, sedangkan densitas yang terlalu tinggi meningkatkan pressure drop sehingga mengurangi efektivitas pendinginan. Hasil penelitian ini menunjukkan bahwa optimasi densitas cooling pad merupakan faktor penting dalam meningkatkan performa sistem evaporative cooling berbasis pembasahan pasif yang lebih sederhana dan hemat energi.
Effectiveness of Ergonomics-Based Occupational Health and Safety Assistance on Work Behavior and Welfare of Small-Scale Tofu Industry Workers: A Quasi-Experimental Study al-manan, oesman raliby; Ulinuha, Faisa Nisa
Borobudur Engineering Review Vol. 6 No. 1 (2026): Advanced Industry
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/nbe21v87

Abstract

Small-scale tofu manufacturing involves multiple occupational hazards including physical accidents, heat exposure, non-ergonomic working postures, and inadequate personal protective equipment. This study aimed to evaluate the effectiveness of an ergonomics-based occupational health and safety (OHS) assistance program on knowledge, attitude, and actual work behavior among tofu workers in Yogyakarta. A quasi-experimental pre-post design was employed with 17 respondents over a two-month intervention period. Evaluation instruments covered three components: a knowledge test (correct/incorrect), a 5-point Likert attitude scale, and a behavioral observation sheet (1–4 scale) across five OHS indicators. Results showed knowledge improvement from 76.5% to 94.1% (Δ +17.6%). Attitude scores improved significantly (M pre = 18.00 vs. M post = 18.65; t(16) = −2.28, p = .037, Cohen's d = 0.53). The most substantial change occurred in observed work behavior, with total mean scores rising from 8.12 to 16.35 (Δ +101.4%; t(16) = −16.11, p < .001, Cohen's d = 5.66). The largest single-indicator gain was in daily OHS communication (Δ +2.18 points). These findings indicate that participatory, environment-modification-based assistance is effective in changing OHS behavior among micro and small-scale enterprises
Analisis Efektivitas Mesin Hot Press Yamamoto 45 Opening Menggunakan Metode Overall Equipment Effectiveness dan Fault Tree Analysis: Analysis of the Effectiveness of the Yamamoto 45-Opening Hot Press Machine Using Overall Equipment Effectiveness and Fault Tree Analysis Methods Rawan S, Hend; Raliby Al Manan, Oesman; Rosyidi, Muhammad Imron
Borobudur Engineering Review Vol. 6 No. 1 (2026): Advanced Industry
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/dxteyy88

Abstract

T This thesis entitled "Analysis of the Effectiveness of the Yamamoto 45 Opening Hot Press Machine Using the Overall Equipment Effectiveness and Fault Tree Analysis Methods (Case Study : PT Dharma Satya Nusantara Temanggung)", was written by Hendrawan Saputra, an Industrial Engineering student at the University of Muhammadiyah Magelang. This research was motivated by the high number of downtimes in the period January 2024 - October 2024 reaching a total of 16687 minutes or 278 hours. This study aims to calculate the effectiveness value of the Yamamoto 45 Opening Hot Press machine and determine the factors that cause downtime on the machine. The data used is historical production and maintenance data covering availability, performance, and quality. The results of the Overall Equipment Effectiveness (OEE) calculation show an average value of 75.41%. It can be concluded that it does not meet the international OEE standard according to Nakajima (1988), which is a value above 85%. The results of the Six Big Losses calculation show that the largest losses come from quality defects and rework, with an average value of 18.21%. Fault Tree Analysis (FTA) analysis shows that the dominant factors causing quality defects and rework are minus materials, large press marks, small press marks, and lack of putty. Based on the results of the study, it can be concluded that the decrease in the OEE value is caused by the quality rate which indicates a fairly high percentage of defects. Recommendations for improvement include checking the putty process which must be dry, checking the cleanliness of the material before entering the platten, and the Team leader must check each operator inserting the material into the platten whether it is centered or not. The application of the OEE, Six Big Losses, and FTA methods can help companies systematically calculate a machine's effectiveness, identify dominant losses, and develop improvement recommendations.
Karakteristik Sistem Pendingin dengan Penambahan Bahan Additive (Natrium Kromat, Ethylene Glycol, dan Aquades) pada Gasoline Engine 125 cc: Characteristics of a Cooling System with the Addition of Additives (Sodium Chromate, Ethylene Glycol, and Distilled Water) in a 125 cc Gasoline Engine Fuadin, Kurnia; Fatoni, Achmad Fadhil; Habiby, Ilham; Munahar, Suroto
Borobudur Engineering Review Vol. 6 No. 1 (2026): Advanced Industry
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/rpcq9p09

Abstract

Radiator merupakan komponen penting pada sistem pendinginan mesin sepeda motor yang berfungsi menjaga suhu kerja mesin tetap optimal. Pendinginan yang kurang efektif dapat menyebabkan overheating dan memperpendek umur mesin. Penelitian ini bertujuan menganalisis efektivitas cairan pendingin (coolant) dengan penambahan additive natrium kromat (Na₂CrO₄) dalam campuran ethylene glycol (EG) dan aquades pada mesin Honda Vario 125cc. Metode penelitian menggunakan eksperimen dengan variasi konsentrasi Na₂CrO₄ sebesar 0,3%, 0,5%, dan 0,7%. Pengujian dilakukan pada berbagai putaran mesin untuk mengukur suhu masuk dan keluar radiator serta menghitung efektivitas pendinginan. Hasil penelitian menunjukkan bahwa campuran EG dan aquades dengan penambahan Na₂CrO₄ sebesar 0,7% menghasilkan efektivitas pendinginan tertinggi, terutama pada putaran mesin tinggi. Peningkatan ini disebabkan oleh konduktivitas termal yang lebih baik serta kemampuan menghambat korosi, sehingga permukaan perpindahan panas radiator tetap bersih dan efisien. Kombinasi tersebut mampu menjaga stabilitas sistem pendinginan pada suhu dan beban mesin tinggi. Namun, penelitian ini belum menguji konsentrasi di atas 0,7% maupun efek jangka panjang terhadap korosi. Penelitian selanjutnya disarankan mengeksplorasi konsentrasi lebih tinggi dan mengkaji durabilitas sistem pendingin secara menyeluruh

Page 6 of 6 | Total Record : 55

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