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All Journal Rotasi R.E.M (Rekyasa Energi Manufaktur) Jurnal 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 Journal of Applied Science, Engineering, Technology, and Education International Journal of Marine Engineering Innovation and Research Jurnal Bakti Masyarakat Indonesia Journal La Multiapp 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
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Neuroscience Nursing Physics Public Health Social Sciences Transportation Other

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Numerical Study of Thermal Hydraulic Performance Improvement in Double Pipe Heat Exchangers Using Different Corrugated Tube Geometries Muhammad Hisyam Haidar Al Ghazi; Damora Rhakasywi; Fahrudin Fahrudin
Journal of Mechanical Engineering, Science, and Innovation Vol 6, No 1 (2026): (April)
Publisher : Institut Teknologi Adhi Tama Surabaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2026.v6i1.8748

Abstract

Enhancing thermal efficiency in double-pipe heat exchangers has become a key industrial priority to reduce energy consumption, with passive methods such as pipe geometry modification receiving significant attention. This study investigates the comprehensive thermal and hydraulic performance of concave corrugated tubes (CCT) with triangular, square, and trapezoidal profiles. A three-dimensional numerical simulation was employed, utilizing the finite volume method and the SST k-ω turbulence model over a Reynolds number range of 7700 to 13,800. The results indicate that all CCT geometries improve thermal performance compared to plain tubes, with the square profile showing the highest increase in Nusselt number (13.87–16.59%). This enhancement is attributed to higher turbulence intensity, which, however, also results in the greatest hydraulic penalty due to dominant form drag. Performance Evaluation Criteria (PEC) analysis yielded values above 1 for all geometries, with the square profile being optimal at lower Reynolds numbers, whereas the triangular profile outperformed the others at higher flow rates (Re 12,300), with a PEC value of 1.023. In conclusion, corrugated geometries have been shown to enhance thermal performance, but the associated hydraulic penalties necessitate careful selection based on the operational flow range to achieve an optimal balance between heat-transfer gains and pumping-power requirements.
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.
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 Daris Naufal, Ridwan David, Jerico Dewanto, Ramadhan Haryo Dewi, Talitha Cahya Kemala Didit Widiyanto Diraharja, Rifat Satrio Dora Samaria F. Firmansyah Fahrudin Fahrudin fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Fahrudin Ulwani Fahrudin, Fahrudin Fajri Ashfi Rayhan Fazli Iqbal Pasha Fazli Iqbal Pasha Febriana, Miftakhul Jannah Firmansyah Firmansyah Firmansyah Francisco, Jeremi Harinaldi . Irga Irga juwariyah, tatik Lina Ayu Marcelina Muhamad Farad Sutarya Muhammad Hisyam Haidar Al Ghazi Muhammad Naufal Bari Muhammad Naufal Bari 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 Rachman, Muhammad Nanda Fatur Raja Shadam Ali Imron Rayhan Suryo Kusumo Regina N. Lumbantoruan Regina Natalindah Lumbantoruan 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