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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 183 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.
Finite Element Evaluation of Torsional Deformation and Stress Distribution in a Pump-Turbine Shaft System: Evaluasi Elemen Hingga terhadap Deformasi Torsi dan Distribusi Tegangan pada Sistem Poros Pompa-Turbin Rizki Sopandi; Adhita Prasetia; Udin Komarudin
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.v11i2.1859

Abstract

This study evaluates the torsional deformation and stress distribution of a pump-turbine shaft system using the finite element method implemented in SolidWorks Simulation. Unlike previous studies that focused only on the turbine shaft, this research analyzes the mechanical response of the entire shaft system consisting of the thrust bearing shaft, pump shaft, and turbine shaft. The shaft model was developed based on the actual dimensions of the Tarum Barat hydraulic pumping system and analyzed under static torsional loading conditions. The shaft material was SCM4 steel (AISI 4140), assumed to be homogeneous, isotropic, and linearly elastic. A torque of 6016 N·m was applied to represent the operating condition, while boundary conditions were assigned at the bearing support locations. The simulation results indicate a maximum displacement of 0.663 mm, a maximum strain of 0.000993, and a maximum Von Mises stress of 360 MPa, all occurring in the turbine shaft region. The calculated safety factor of 1.72 indicates that the maximum working stress remains below the material yield strength of 620 MPa, confirming that the shaft system operates within the elastic region under the applied loading condition. These findings identify the turbine shaft as the most critical region in the shaft system and provide a basis for design evaluation and preventive maintenance of hydraulic pump shaft systems.
The Effect of Agitator Rotational Speed ​​on Cooling Rate and Reynolds Number in a Block Ice Making Machine Using 20% ​​NaCl Brine: Pengaruh Kecepatan Putar Agitator terhadap Cooling Rate dan Reynolds Number pada Mesin Pembuat Es Balok Menggunakan Media Brine NaCl 20% irfan ramadhan; Nia Nuraeni Suryaman; Arifin Santosa; Aep Saepudin
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.v11i2.1860

Abstract

This study investigates the effect of agitator rotational speed on the Cooling Rate and flow characteristics of a 20% NaCl brine solution in a block ice machine. Experiments were conducted at agitator speeds of 450, 550, and 650 RPM. Temperature data were recorded using K-type thermocouples installed at the brine inlet, brine outlet, and ice cans. Cooling performance was evaluated using the Cooling Rate, while flow characteristics were analyzed through the Impeller Reynolds Number. The results showed that increasing agitator speed improved cooling performance and fluid circulation. The Cooling Rate increased from 0.037 °C/min at 450 RPM to 0.079 °C/min at 650 RPM, while the Impeller Reynolds Number increased from 100,121 to 144,575. All operating conditions were classified as turbulent flow. The best cooling performance was achieved at 650 RPM, resulting in the highest Cooling Rate and the shortest cooling time.
Analysis of the Effect of Phase Change Material Mass Variation on the Performance of an Air-Cooled Photovoltaic-Thermal System: Analisis Pengaruh Variasi Massa Phase Change Material terhadap Kinerja Sistem Photovoltaic Thermal Berbasis Pendingin Udara Muhammad Alvan Fadillah; Udin Komarudin; Ahmad Rajani
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.v11i2.1861

Abstract

This study evaluates an air-based photovoltaic thermal (PV/T) double-pass system integrated with paraffin wax phase change material (PCM). Three PCM masses, namely 1000 g, 2000 g, and 3000 g, were tested and compared under equal solar irradiance so that the thermal response could be evaluated under comparable radiation conditions. The apparatus consists of a PV module, 6 mm glass cover, air duct, reflector/absorber plate, PCM containers, type-K thermocouples, DHT22 sensors, solar power meter, anemometer, Testo 405i probe, and data logger. The results show that the average air temperature difference was 6.74°C, 6.72°C, and 6.91°C for PCM 1000 g, 2000 g, and 3000 g, respectively. The average reflector temperature decreased from 44.97°C at PCM 1000 g to 43.45°C at PCM 3000 g, indicating better heat buffering with larger PCM mass levels.
Erosion Behavior of Cr₃C₂-NiCr Coated GH4720Li Superalloy Under Different Impact Angles and Erodent Sizes: A Finite Element Analysis Raffi Indrajati; Riki Hendra Purba; James Julian; Fitri Wahyuni; Elvi Armadani; Fathin Muhammad Mahdhudhu
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.v11i2.1862

Abstract

Solid particle erosion is a critical issue for turbine blade materials operating in harsh environments. This study investigates the erosion behavior of Cr₃C₂-NiCr coated GH4720Li superalloy using a three-dimensional single-particle finite element model. Silica sand particles with diameters of 0.3, 0.5, and 0.7 mm impacted the surface at 30°, 60°, and 90°, while material behavior was described by the strain-rate-dependent Cowper–Symonds model. The results show that both impact angle and particle size significantly affect stress distribution, plastic deformation, and erosion behavior. Higher impact angles and larger particles produce greater von Mises stress and effective plastic strain, with maximum values at 90° and 0.7 mm. The erosion mechanism changes from cutting at 30° to combined cutting and crater formation at 60°, and localized crater formation at 90°. The Cr₃C₂-NiCr coating improves erosion resistance by reducing stress concentration and plastic deformation through impact energy absorption and redistribution

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