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All Journal Rotasi R.E.M (Rekyasa Energi Manufaktur) Jurnal Edumatsains Jurnal Kreativitas PKM PEDULI: Jurnal Imiah Pengabdian Pada Masyarakat Indonesian Journal of Community Dedication Piston: Journal of Technical Engineering Indonesian Journal of Education and Mathematical Science Abdimas: Jurnal Pengabdian Masyarakat Universitas Merdeka Malang Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Journal of Applied Science, Engineering, Technology, and Education International Journal of Marine Engineering Innovation and Research Jurnal Bakti Masyarakat Indonesia Journal La Multiapp Multidiciplinary Output Research for Actual and International Issue (Morfai Journal) Indonesian Journal of Innovation Studies Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Journal of Mechanical Engineering, Science, and Innovation Eduvest - Journal of Universal Studies Madani : Jurnal Pengabdian Kepada Masyarakat Prosiding Seminar Nasional Unimus Jurnal Polimesin Nemui Nyimah Academia Open
Damora Rhakasywi
Mechanical Engineering Department, Faculty Of Engineering, Universitas Pembangunan Nasional Veteran Jakarta, Jl. Limo Raya No.80, Limo, Kota Depok, Jawa Barat, 16514, Indonesia
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Thermodynamic performance evaluation of a steam turbine at kamojang geothermal power plant using operational data Firmansyah Firmansyah; Fahrudin Fahrudin; Damora Rhakasywi; Regina Natalindah Lumbantoruan; Fazli Iqbal Pasha; Putty Fauthyda Zahra Hapidzha
Jurnal Polimesin Vol 24, No 3 (2026): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i3.8953

Abstract

Geothermal power plants play a significant role in sustainable energy systems due to their ability to provide stable baseload electricity with relatively low carbon emissions. This study investigates the thermodynamic performance of the steam turbine at Kamojang Geothermal Power Plant Unit X using operational data collected over 29 days and processed into 6-hour averages to represent the local operating envelope around the turbine design point. A multiple linear regression model was developed to evaluate the effects of steam mass flow rate, inlet steam pressure, inlet steam temperature, and condenser pressure on turbine isentropic efficiency. The results indicate that inlet steam pressure, inlet steam temperature, and condenser pressure significantly influence turbine efficiency, whereas steam mass flow rate has no significant effect. The model explains 43.8% of the variation in turbine isentropic efficiency (R²=0.438) and yields a low in-sample prediction error (MAPE=0.12%), indicating that the regression closely reproduces the observed data within the limited operating range. In contrast, a considerable portion of the variation remains unexplained. Condenser pressure was identified as the dominant influencing parameter. These findings suggest that local deviations from the design point may contribute to off-design operation and additional thermodynamic irreversibility, providing practical implications for performance monitoring and operational optimization in geothermal power plants.
The Effect of Glazing Cover Material on Box-Type Solar Cooker performance: Pengaruh Bahan Penutup Kaca terhadap Kinerja Kompor Surya Tipe Kotak Muhammad Naufal Bari; Damora Rhakasywi; Fahrudin
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.v11i1.1828

Abstract

This study compares two types of glass materials applied to a box-type solar cooker, namely low-iron glass and soda-lime glass. Low-iron glass is produced with a reduced iron oxide content, resulting in a higher transparency level compared to soda-lime glass, which affects its optical properties, particularly transmittance. The testing was conducted under two conditions: a stagnation test and a load test using 1 kg of water. The results indicated that the soda-lime glass system was superior, successfully boiling water up to 101.25 °C with a thermal efficiency of 0.48, an F1 value of 0.22, and an F2 value of 0.51. In contrast, the low-iron glass failed to boil the water, as the temperature only reached 79.25 °C, and it did not meet the load test feasibility standard, recording an F2 of 0.13 and an efficiency of 0.25.
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.
Exergy Analysis and Optimization of Kamojang Geothermal Power Plant Dry Steam Type Capacity 55 MW Rayhan Suryo Kusumo; Damora Rhakasywi; Fahrudin Fahrudin
Eduvest - Journal of Universal Studies Vol. 4 No. 12 (2024): Journal Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/eduvest.v4i12.44733

Abstract

This study aims to analyze the exergy efficiency and irreversibility of the Kamojang Unit 2 Geothermal Power Plant (GPP) in Indonesia using an exergy analysis method. The results reveal that the turbine exhibits the highest exergy loss of 11,512 kW with an exergy efficiency of 82.78%. The condenser records the second-largest exergy loss of 9,875 kW, while the inter condenser and after condenser show the lowest exergy efficiencies at 22.6% and 38.55%, respectively. The overall system exergy efficiency is 65.3%, producing 63,261 kW of electricity from an input exergy of 96,764 kW. Optimization was conducted by varying the turbine inlet pressure from 4.5 to 6.5 bar, with the optimal pressure determined to be 4.5 bar, resulting in the highest exergy efficiency and the lowest irreversibility. This research provides valuable insights for enhancing geothermal power plant efficiency through thermodynamic parameter optimization.
Analysis of the Effect of Thermal Condition Parameters on the Strength of the Coil Lifting C-Hook Using the Finite Element Method (Case Study at PT. X) Raja Shadam Ali Imron; Sigit Pradana; Damora Rhakasywi
Eduvest - Journal of Universal Studies Vol. 5 No. 11 (2025): Eduvest - Journal of Universal Studies
Publisher : Green Publisher Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59188/eduvest.v5i11.52379

Abstract

In the steel industry, Coil Lifting C-Hooks are used to lift high-temperature wire rods after rolling. The main challenge with this tool is repeated loading and high temperatures, which affect its structural strength. This study uses Finite Element Method (FEM) simulation in ANSYS to analyze the impact of repeated loading and high temperatures on structural strength parameters at temperatures of 170°C and 200°C. The simulation was conducted using steady-state thermal analysis and followed by static structural analysis. The results show that repeated loading and increased temperature increase deformation (maximum 2.4358 mm) at 170°C and (maximum 2.425 mm) at 200°C, von-Mises stress (maximum 140.86 MPa) at 170°C and (maximum 158.53 MPa) at 200°C, and reduced fatigue life (minimum 2,286,900 cycles) at 170°C and (minimum 1,394,500 cycles) at 200°C, as well as the safety factor (minimum 1.0954) at 170°C and (minimum 0.973) at 200°C, particularly in the C-Hook curved area. This underscores the importance of C-Hook design that accounts for thermal effects.
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.
NUMERICAL INVESTIGATION OF DEPTH RATIO EFFECTS ON THERMOHYDRAULIC PERFORMANCE OF A HEAT EXCHANGER WITH V-CUT TWISTED TAPE Farrel Rizqiadinata; Damora Rhakasywi; Nicky Yongkimandalan
Multidiciplinary Output Research For Actual and International Issue (MORFAI) Vol. 6 No. 5 (2026): Multidiciplinary Output Research For Actual and International Issue
Publisher : RADJA PUBLIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.21613820

Abstract

Using Computational Fluid Dynamics (CFD), this research evaluates the thermo-hydraulic effects of altering the depth ratio of V-cut twisted tape (VTT) inserts within tubular heat exchangers. Three specific configurations (De/w = 0.25, 0.35, and 0.45) were simulated and compared to baseline cases of plain tubes and traditional twisted tapes. System characteristics were analyzed using flow behavior, Nusselt number, friction factor, and the Performance Evaluation Criterion (PEC). To ensure reliability, the numerical framework was verified using established empirical correlations and experimental data, yielding deviations below 5%. The simulated outcomes indicate that swirl generation, enhanced radial mixing, and thermal boundary-layer disruption drive the heat transfer improvements of the twisted tapes, with the V-cut geometries accelerating vortex generation and fluid recirculation. Although VTT systems successfully optimize thermal dissipation, they incur elevated hydraulic penalties. This trade-off between pressure drop and thermal efficiency is clearly reflected in the PEC trends, where flow visualizations confirm that larger depth ratios significantly augment fluid mixing and thermal restructuring.
Numerical Study of Fillet Effects on Cavitation Development in Double Contraction Pipes Ridwan Daris Naufal; Damora Rhakasywi; Fahrudin Fahrudin
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 3 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i3

Abstract

Experimental Study on Refuse-Derived Fuel Moisture Content and Gasification Efficiency for Sustainable Energy Putty Fauthyda Zahra Hapidzha; Damora Rhakasywi; Fahrudin; Regina N. Lumbantoruan; Fazli Iqbal Pasha; M. Reza Marista; Firmansyah
Jurnal ASIIMETRIK Jurnal Ilmiah Rekayasa & Inovasi Volume 8 Number 2 (2026)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v8i2.10087

Abstract

This study investigates the effect of moisture content in Refuse-Derived Fuel on gasification efficiency at a Waste-to-Energy Power Plant in Surakarta. Using a fixed-bed downdraft gasifier, the research experimentally tests two MC levels of 20% and 50%. High moisture content can absorb significant thermal energy during evaporation, potentially lowering reaction temperatures and syngas quality. The primary objective is to determine the optimal moisture content that maximizes Cold Gas Efficiency and syngas heating value. Results indicate that high feedstock moisture content triggers severe thermal damping within the gasifier core. Parasitic energy consumption for water vaporization significantly suppressed internal bed temperatures (Reactor and Belly zones), thereby chemically quenching primary endothermic carbon-cracking pathways. The mean Cold Gas Efficiency plummeted from an optimized peak of 42.86% in April down to a compromised level of 28.30% in June. These findings provide critical quantitative data and demonstrate that enforcing strict mechanical pre-treatment drying to lock the input moisture threshold near 20% is thermodynamically mandatory to avoid reaction quenching and ensure commercial power-generation viability in tropical climates.
Comparative Electro-Thermal Mathematical Modeling of Transient Temperature Distribution in Pouch and Cylindrical Li-Ion Battery Cells Eko Andi Prasetyo; Damora Rhakasywi; Fahrudin
EduMatSains : Jurnal Pendidikan, Matematika dan Sains Vol 11 No 1 (2026): July
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Kristen Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33541/edumatsains.v11i1.8492

Abstract

The increasing rate of internal heat accumulation during high-power discharge represents a major challenge in the design of Battery Thermal Management Systems (BTMS) for electric vehicles. Battery cell geometry plays a significant role in determining heat propagation pathways and heat dissipation characteristics. This study aims to conduct a comparative evaluation of the transient temperature distribution between cylindrical and pouch Lithium-ion battery cells using a one-dimensional (1D) electro-thermal mathematical model. The model was developed based on the principles of energy conservation and the Bernardi heat generation equation and was numerically solved using the Finite Difference Method (FDM) with an Explicit Euler scheme implemented in Python. Simulations were performed under various discharge rates (1C, 3C, and 5C). The results indicate that cylindrical cells are highly susceptible to the core thermal trapping phenomenon, reaching a maximum core temperature of 52.64°C at a 5C discharge rate, whereas the maximum core temperature of pouch cells was limited to 50.61°C under the same operating condition. Furthermore, the larger surface-area-to-volume ratio of pouch cells resulted in lower and more uniform surface temperature profiles. The developed 1D model was successfully validated against published three-dimensional finite element simulation data, yielding prediction errors ranging from 0.09% to 1.12%. Overall, the findings indicate that the proposed comparative 1D model provides reliable temperature predictions while requiring relatively low computational effort, making it a practical option for preliminary thermal analysis and battery pack design in electric vehicle applications.
Co-Authors Abhitah, Athallah Nabiel Achmad Zuchriadi Amir Marasabessy Anisa Rahmah Kusuma Annisa Fitriola Suryawati Armansyah Armansyah Ashfi Rayhan, Fajri Asih Melati Asrianti, Nadia Putri Bambang Sudjasta Bambang Sudjasta Bambang Sudjasta Bima Rakha Adhitama Budhi Martana Christoforus Deberland David, Jerico Dewanto, Ramadhan Haryo Dewi, Talitha Cahya Kemala Didit Widiyanto Diraharja, Rifat Satrio Dora Samaria Eko Andi Prasetyo F. Firmansyah fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Ulwani Fahrudin, Fahrudin Fajri Ashfi Rayhan Farrel Rizqiadinata Fazli Iqbal Pasha Fazli Iqbal Pasha Fazli Iqbal Pasha Febriana, Miftakhul Jannah Firmansyah Firmansyah Firmansyah Firmansyah Francisco, Jeremi Harinaldi . Irga Irga juwariyah, tatik Lina Ayu Marcelina M. Reza Marista Muhamad Farad Sutarya Muhammad Hisyam Haidar Al Ghazi Muhammad Naufal Bari Muhammad Naufal Bari Naufal Faizurrahman Siregar Nicky Yongkimandalan Nicky Yongkimandalan Nicky Yongkimandalan Nicky Yongkimandalan Nur Cholis Nurzati, Syarif Adhika Adhin Pamungkas, Eny Dewi Parluhutan, Yohanes Mangatur Prasetyo, Eko Andi Putty Fauthyda Z. H. Putty Fauthyda Zahra Hapidzha Putty Fauthyda Zahra Hapidzha Rachman, Muhammad Nanda Fatur Raja Shadam Ali Imron Rayhan Suryo Kusumo Regina N. Lumbantoruan Regina N. Lumbantoruan Regina Natalindah Lumbantoruan Ridwan Daris Naufal Rita Ismail Rizki Apriza Rizkiati Ramadhani, Mahirah Salwa Aurelia Ananda Rosidi, Erlia Nurbayti Shafa, Naura Sigit Pradana Sitorus, Henri BH Sudjasta, Bambang Sulistyawati, Wiwin Suryo, Taufik Hadi Sutarya, Muhamad Farad Syifaul Janan Teris Ekamila Wiwin Sulistyawati Yohanes Mangatur Parluhutan Yuliana Dewi Z. H. Putty Fauthyda