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R.E.M (Rekyasa Energi Manufaktur) Jurnal
Published by Universitas Muhammadiyah Sidoarjo
ISSN : 25275674     EISSN : 25283723     DOI : https://doi.org/10.21070/r.e.m
Core Subject : Engineering,
Engineering
Focus and Scope Aim: to facilitate scholar, researchers, and teachers for publishing the original articles of review articles. Scope: Mechanical Engineering include: Energy Conversion Renewable Energy Manufacturing Materials and Design Engineering Mechatronics
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 176 Documents
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Effect of Flow Disturbance Geometry on Thermal Hydraulic Performance of Forced Air-Cooled Heat Sinks for CPU Cooling Annisa Fitriola Suryawati; Damora Rhakasywi; Nicky Yongkimandalan; Bima Rakha Adhitama
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 1 (2026): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i1.1840

Abstract

The increasing thermal load in modern electronic devices necessitates efficient and reliable cooling strategies, particularly for air-cooled heat sinks in CPU applications. This study numerically investigates the effect of flow-disturbance geometry on the thermal–hydraulic performance of a forced air-cooled channel under constant heat flux. Three configurations—circular, square, and octagonal—were evaluated against a baseline using a validated CFD approach based on the RANS equations with the k–ω SST model, with a 7.65% deviation. The results show that geometric disturbances significantly influence temperature distribution and pressure drop. The octagonal model achieves the lowest excess temperature across airflow velocities of 1–2 m/s but produces the highest pressure drop, while the square model provides notable temperature reduction with moderate pressure loss by improving airflow uniformity and disrupting the thermal boundary layer. Overall, the square configuration offers the most optimal balance between heat transfer and energy efficiency.
Performance Analysis of Waste Heat Recovery-Based Fish Drying System in Block Ice Machine: Analisis Kinerja Sistem Pengering Ikan Berbasis Waste Heat Recovery Pada Mesin Es Balok Agung Firmansyah; Nia Nuraeni Suryaman; Arifin Santosa; Ahmad Rajani
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 1 (2026): June
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i1.1852

Abstract

Penelitian ini menganalisis performa sistem pengering ikan berbasis pemanfaatan panas buang kondensor mesin es balok melalui metode waste heat recovery tanpa pemanas tambahan eksternal. Metode penelitian menggunakan eksperimen kuantitatif dengan membandingkan sistem pengering berbasis panas kondensor dan pengeringan konvensional menggunakan sinar matahari langsung. Analisis penelitian difokuskan pada karakteristik termal, penurunan kadar air, performa pengeringan, dan konsumsi energi sistem. Sistem pengering berbasis panas kondensor menghasilkan kondisi pengeringan yang lebih stabil dengan temperatur berkisar antara 31,17-40,87°C dan relative humidity menurun dari 100% menjadi 57%. Massa ikan menurun dari 1000 gram menjadi 413 gram yang menunjukkan terjadinya evaporasi air secara kontinu selama proses pengeringan. Sistem menghasilkan nilai rata-rata Specific Energy Consumption (SEC) sebesar 9,40 kWh/kg dan Specific Moisture Extraction Rate (SMER) sebesar 0,10 kg/kWh. Hasil penelitian menunjukkan bahwa panas buang kondensor berpotensi digunakan sebagai sumber energi alternatif pada proses pengeringan ikan yang lebih stabil, terkontrol, dan tidak bergantung secara langsung terhadap kondisi cuaca. Namun, optimasi lebih lanjut terhadap performa kondensor dan kapasitas sistem refrigerasi masih diperlukan untuk meningkatkan performa perpindahan panas dan efisiensi energi sistem pengering.
The Implementation of Industry 4.0 and Blockchain Technology in Improving the Efficiency and Transparency of Circular Supply Chains: A Study on the Manufacturing Industry: Analisis Efisiensi Hasil dan Tingkat Kerugian dalam Rantai Pasokan Manufaktur Kayu Lapis Berbasis Industri 4.0 Lolyka Dewi Indrasari; Ana Komari
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 2 (2026): In Progress
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i2.1773

Abstract

This study aims to analyze Yield Efficiency and Loss Rate in an Industry 4.0-based plywood manufacturing supply chain to improve production efficiency and support sustainable supply chain performance. A descriptive quantitative approach with a case study was employed in a plywood manufacturing industry located in Kediri, Indonesia. The data consisted of monthly production records from January to December 2024, including total logs, super-grade logs, and downgraded logs. Forecasting methods applied in this study were the 3-Month Moving Average and Single Exponential Smoothing with a smoothing constant (α) of 0.9. The performance of both methods was evaluated using Mean Squared Error (MSE), Root Mean Square Error (RMSE), Mean Absolute Percentage Error (MAPE), the Shapiro-Wilk normality test, significance testing, and a 95% confidence interval. The results indicate that the 3-Month Moving Average method provides better forecasting accuracy, with an MSE of 12,742,092, an RMSE of 4,113.77, and a MAPE of 22.70%, which are lower than those obtained using Single Exponential Smoothing. Statistical test results reveal that the residuals are normally distributed and exhibit no significant bias, indicating that the forecasting model is valid. Furthermore, the findings demonstrate that the implementation of the Industry 4.0 approach supports Yield Efficiency control and minimizes Loss Rate, thereby enhancing the sustainable performance of the plywood manufacturing supply chain.
Analysis of Thermal Effectiveness and Mass Flow Rate of Steam from Saturated to Superheater in Palm Oil Mill: Analisis Efektivitas Thermal dan Laju Aliran Massa Steam dari Saturated Menuju Superheater di Pabrik Kelapa Sawit Andhi Fuad Bawazir; Zulham Effendi
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 2 (2026): In Progress
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i2.1844

Abstract

In the Palm Oil Mill (PKS) production system, the boiler is the main component that functions to produce steam for processing needs and turbine driving. The performance of the superheater plays an important role in improving steam quality by converting saturated steam into superheated steam, thereby supporting boiler operational efficiency. This study aims to analyze the thermal effectiveness of the superheater and determine the steam mass flow rate in the Takuma N-750 type boiler in the Palm Oil Mill. The research method used is descriptive quantitative with the collection of boiler operational data for five days of observation. The data analyzed include the superheater outlet steam temperature, operating pressure, steam density, and pipe cross-sectional area. The enthalpy value is determined through steam table interpolation using ChemicalLogic SteamTab Companion software. The results show that the superheater outlet steam temperature is in the range of 297.2–305.4°C with a stable operating pressure of 21 bar. The steam mass flow rate ranged from 23.28–26.71 tons/hour or 6.40–7.42 kg/second, with an average value close to the boiler design capacity of 27 tons/hour. The actual enthalpy value of the superheater outlet steam was in the range of 3014.75–3033.91 kJ/kg, while the design enthalpy was 3135.54 kJ/kg. The calculation results showed that the thermal effectiveness of the superheater was in the range of 96.1–96.7%, indicating that the heat transfer process was effective and relatively stable during the observation period. The stability of temperature, operating pressure, and mass flow rate indicated that the boiler operated at steady-state conditions with good system performance and was able to support the processing needs in the palm oil mill.
Application of Linear Programming to Reduce Traffic Congestion in Urban Centers: A Case Study of Lagos State Transport Authority Anthony Adekoya; Wasiu Adedeji; Seun Oyelami; Busayo Adeboye
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 2 (2026): In Progress
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i2.1848

Abstract

Traffic congestion in urban centres is a persistent challenge with long-term socioeconomic, environmental, and health consequences. Lagos, Nigeria, one of Africa's fastest-growing megacities, faces severe gridlock across its road network managed by the Lagos State Transport Authority (LAMATA), which serves over twenty million daily commuters. This paper applies linear programming (LP) to develop an optimisation model that minimises total vehicular delay time across five key corridors of the Lagos metropolitan road network, subject to road capacity, signal-cycle, and modal-split constraints. Traffic count data were gathered during peak and off-peak periods over twelve weeks on the Apapa-Oshodi, Lagos Island-Victoria Island, Ojota-Ketu, Lekki-Ajah, and Ikeja Along-Agege corridors. The simplex method was applied to solve the LP model, and sensitivity analysis was conducted to assess solution stability under demand variations of ±20%. Results show that average peak-hour delay and total vehicular hours lost (VHT) per day can be reduced by 34.7% and 28.4% respectively, through optimised reallocation of green-signal time and promotion of bus rapid transit (BRT) and non-motorised transport (NMT) modes. The model remains stable within demand fluctuations of ±15%, confirming its practical utility. The findings offer actionable policy support for LAMATA planners and demonstrate the significant potential of mathematical programming in evidence-based urban transport policy.
Thermo-hydraulic Performance of Double-cut and Perforated Twisted Tape Based on Constant Surface Area Naufal Faizurrahman Siregar; Damora Rhakasywi; Nicky Yongkimandalan
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 11 No 2 (2026): In Progress
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v11i2.1856

Abstract

Improving the heat transfer of the heat exchanger pipe needs to be done. Inserting twisted tapes is often applied because it increases the Nusselt number, but it causes excessive pressure drop. This study investigates three variations of twisted tape, namely: plain, semicircular double cut, and circular perforation. The research gap concerns reducing the surface area of the twisted tape to the same area. Simulation using ANSYS Fluent. Variation analysis shows the Nusselt number increased by 36.64% for smooth, 40.94% for double semicircular cuts, and 36.95% for circular perforations. The friction factor increased by 232.26%, 253.46%, and 239.96%, respectively. The PEC value for each variation below 1 indicates a decrease in efficiency after the addition of the twisted tape. However, this study concludes that the double cut has the highest efficiency compared to other variations for the Reynolds number range of 6000 to 17000.

Page 18 of 18 | Total Record : 176

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