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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 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 Academia Open Journal La Multiapp Indonesian Journal of Innovation Studies Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) Eduvest - Journal of Universal Studies Madani : Jurnal Pengabdian Kepada Masyarakat Prosiding Seminar Nasional Unimus Nemui Nyimah
Damora Rhakasywi
Departement Of Mechanical Engineering, Universitas Pembangunan Nasional “Veteran” Jakarta
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance 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 Mechanical Engineering Medicine & Pharmacology Neuroscience Nursing Physics Public Health Social Sciences Transportation Other

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Increasing The Performance Of A 500 W Small Scale Wind Turbine Through Blade Optimization With Low Wind Speed Computational Simulation Studies Rhakasywi, Damora
ROTASI Vol 27, No 2 (2025): VOLUME 27, NOMOR 2, JULI 2025
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.27.2.37-48

Abstract

The world is currently facing a dual energy crisis of increasing energy needs and the negative impact of the use of fossil energy. Indonesia has large wind energy potential, spread across various archipelagic regions. Based on a study by the Ministry of Energy and Natural Resources (ESDM), the potential for wind energy in Indonesia reaches 20,000 GW, with an mean wind speed of 3-7 m/s, proper design of wind turbine blades is an important aspect to ensure optimal performance and energy efficiency under various natural conditions. This research examines the performance and strength of inverse taper type wind turbine blades for horizontal shaft wind turbines, and pays attention to the characteristics of the wind that blows in Indonesia. This research used the method: TSR (tip speed ratio) design, tip to root chord ratio with tip, airfoil variation and determination of two blade segments combine to optimize linear rotation of the reverse tapered blade. Changes are made by going through a shape and performance selection process to determine the best blade using the BEM (blade element momentum) approach. The best designed blade is made from pine wood and its structure is modeled using the finite element method (FEM) to evaluate its safety level when used. The study results show that the best blade produces a peak Cp of 0.486 at a tip speed ratio (TSR) of 5, with a TSR range for Cp above 0.3 reaching 6.444, and can be used at air velocities of up to 15 m/s featuring a factor of safety (FoS) of 1.020.
Penerapan Lampu Penerangan Jety Tempat Sandar Perahu Nelayan Menggunakan Panel Solar Cell Marasabessy, Amir; Ashfi Rayhan, Fajri; Sulistyawati, Wiwin; Rhakasywi, Damora; Widiyanto, Didit
Indonesian Journal of Community Dedication Vol. 6 No. 2 (2024): Indonesian Journal of Community Dedication (IJCD)
Publisher : STIKES Nani Hasanuddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35892/community.v6i2.2097

Abstract

Desa Pulo ampel Kota Serang terdapat kampung rukun nelayan “Cinta Bahari”. yang secara geografis terletak pada posisi sebelah timur yang membentang dari utara ke selatan sepanjang ± 3 km. Mitra rukun nelayan memiliki perahu ikan 134 unit, 91 unit kapasitas 1 GT, 33 unit kapasitas 2 GT dan 10 unit kapasitas 10 GT bersandar di dermaga yang dibangun melalui swadaya gotong royong dengan panjang 85 meter dan lebar 1,5 meter. Permasalahan mitra rukun nelayan saat ini dermaga belum memiliki penerangan sehingga menjadi hambatan bagi nelayan menyandarkan perahu ikan dan bongkar muat di dermaga pada waktu malam dan pagi hari sehingga  sering terjadi tubrukan antara perahu ikan yang mengakibatkan terjadi kerusakan. Solusi mengatasi permasalahan, dilakukan pemasangan empat tiang lampu penerangan dermaga menggunakan panel solar cell. Pengabdian Kepada Masyarakat bertujuan penerangan listrik dermaga menggunakan panel solar cell Metode yang digunakan adalah penyuluhan dan pelatihan pemasangan komponen panel solar cell pada empat tiang lampu penerangan dermaga. Hasil kegiatan Pengabdian Kepada Masyarakat, kapasitas baterai dapat menampung energi listrik selama 5 jam dimana 2 tiamg lampu penerangan di gunakan pada pukul.19.00 s/d 23.59 wib dan dua tiamg lampu penerangan lainnya di gunakan pukul.01.00 s/d 06.00 wib. untuk kelancaran pengoperasian dan bongkar muat ikan di dermaga. Perhitungan pemasangan empat tiang lampu penerangan menggunakan komponen panel solar cell di dermaga selama lima tahun dengan tidak memperhitungkan penyusutan baterai, dibandingkan jika menggunakan penerangan listrik dari PLN, akan memberikan penekanan biaya Rp.3.360.000 untuk kesejahteraan mitra kelompok nelayan.
The Effect of Solar Panel Tilt Angle Automation on the Efficiency of Hybrid Renewable Energy Systems (HRES) Diraharja, Rifat Satrio; Rhakasywi, Damora; Fahrudin, Fahrudin
Indonesian Journal of Innovation Studies Vol. 26 No. 4 (2025): October
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/ijins.v26i4.1674

Abstract

Background (General): Renewable energy is increasingly critical as fossil fuel reserves decline and global energy demand rises. Background (Specific): Hybrid Renewable Energy Systems (HRES) that combine solar photovoltaic (PV) and wind energy offer reliable alternatives, but fixed solar panels limit energy capture due to suboptimal orientation. Knowledge Gap: While solar tracking has been explored, its effectiveness within small-scale HRES prototypes in real-world conditions remains underexamined. Aim: This study investigates the impact of automated solar panel tilt adjustment on the efficiency of a small-scale HRES integrating a vertical-axis wind turbine. Results: Experimental testing over five days demonstrated that the automated tilt system enhanced solar energy capture by 23–43% compared to fixed-tilt configurations, with daily energy outputs reaching 1,020 Wh, although battery charging remained capped at 60% due to charge controller restrictions. Novelty: The research highlights a low-cost, single-axis automation mechanism controlled by ESP32 and LDR sensors, providing a feasible and scalable solution for off-grid applications. Implications: Findings underscore the potential of affordable solar tracking in hybrid systems to improve energy access in rural or remote areas, while emphasizing the need for improved storage management to fully realize efficiency gains Highlights: Automated tilt improved solar energy capture by 23–43%. Low-cost, ESP32–LDR system proved feasible for rural use. Battery charging limited at 60% due to controller settings. Keywords: Solar Tracking, Hybrid Renewable Energy, Tilt Angle Automation, Energy Efficiency, Off-Grid Systems
Experimental Analysis of the Performance of Savonius VAWT with Different Numbers of Blades on Roofs Francisco, Jeremi; Rhakasywi, Damora; Fahrudin, Fahrudin
Indonesian Journal of Innovation Studies Vol. 26 No. 4 (2025): October
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/ijins.v26i4.1675

Abstract

General Background: Renewable energy is increasingly vital for sustainable development, with wind energy offering significant potential in urban settings where land availability is limited. Specific Background: Vertical axis wind turbines (VAWTs), particularly Savonius types, are promising for rooftop applications but remain underexplored compared to horizontal axis turbines. Knowledge Gap: Limited studies have systematically examined how variations in blade number affect VAWT performance under low wind speed conditions typical of urban environments. Aim: This study investigates the performance of Savonius VAWTs with 3, 4, and 6 blades to determine the optimal configuration for efficient energy generation on building roofs. Results: Experimental testing over 24 hours at an average wind speed of 2 m/s revealed that the 3-blade turbine achieved the best performance, with a tip speed ratio (0.94), coefficient of power (0.242), and voltage output (14.41 V), outperforming the 4-blade and 6-blade designs. Novelty: This work demonstrates that reducing blade count can enhance efficiency in low-speed, rooftop urban wind applications, challenging the assumption that more blades inherently improve performance. Implications: The findings provide insights for optimizing small-scale renewable energy systems in urban areas, contributing to sustainable energy strategies and supporting national renewable energy targets. Highlights: Three-blade Savonius turbine shows highest efficiency at low wind speeds. Blade number directly affects TSR, CP, and voltage output. Rooftop VAWT offers practical solution for small-scale urban energy. Keywords: Wind, Wind Turbine, Tip Speed Ratio, Energy, Green Energy
Pemberdayaan dan Pendampingan Kader Kesehatan terhadap Pelaporan Pemasaran Susu Formula yang Tidak Etis di Wilayah Kecamatan Limo, Depok Ismail, Rita; Pamungkas, Eny Dewi; Marcelina, Lina Ayu; Samaria, Dora; Armansyah, Armansyah; Rhakasywi, Damora; Rizkiati Ramadhani, Mahirah Salwa Aurelia Ananda; Rosidi, Erlia Nurbayti; Dewi, Talitha Cahya Kemala
Jurnal Kreativitas Pengabdian Kepada Masyarakat (PKM) Vol 8, No 10 (2025): Volume 8 No 10 (2025)
Publisher : Universitas Malahayati Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33024/jkpm.v8i10.22339

Abstract

ABSTRAK Pemasaran susu formula yang tidak etis masih menjadi tantangan dalam mendukung ASI eksklusif dan pencegahan stunting. Kegiatan ini bertujuan meningkatkan pengetahuan kader kesehatan di Kecamatan Limo, Depok, mengenai pelaporan praktik pemasaran susu formula. Metode berupa penyuluhan, pemutaran video, Focus Group Discussion (FGD), role play, dan pembentukan Satgas Kader dengan peserta 20 kader. Hasil menunjukkan peningkatan signifikan pengetahuan mengenai praktik pemasaran susu formula, dengan rata-rata nilai pre-test 72,5 menjadi 94,67 pada post-test. Kegiatan ini dapat meningkatkan pengatahuan dan memperkuat peran kader sebagai pengawas dan edukator Masyarakat mengenai praktik pemasaran susu formula. Program ini dapat dilakukan secara berkelanjutan dengan jangkauan lebih luas. Kata Kunci: ASI Eksklusif, Etis, Kader Kesehatan, Susu Formula  ABSTRACT Unethical marketing of formula milk is still a challenge in supporting exclusive breastfeeding and preventing stunting. This activity aims to increase the knowledge of health cadres in Limo District, Depok, regarding reporting on formula milk marketing practices. Methods include counselling, video screenings, Focus Group Discussion (FGD), role plays, and the formation of a Cadre Task Force with 20 cadres participating. The results show a significant increase in knowledge regarding formula milk marketing practices, with an average pre-test score of 72.5 rising to 94.67 in the post-test. This activity can increase knowledge and strengthen the role of cadres as supervisors and community educators regarding formula milk marketing practices. This program can be carried out sustainably with a wider reach. Keywords: Exclusive Breastfeeding, Ethics, Formula Milk, Health Cadres 
High Pressure and Long Compression Improve the Quality of Coffee Waste Biopellets : Tekanan Tinggi dan Kompresi Lama Meningkatkan Kualitas Biopellet Limbah Kopi Nurzati, Syarif Adhika Adhin; Rhakasywi, Damora; Fahrudin, Fahrudin
Indonesian Journal of Innovation Studies Vol. 26 No. 4 (2025): October
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/ijins.v26i4.1790

Abstract

General Background The increasing demand for renewable energy highlights the potential of biomass waste as a sustainable energy source. Specific Background Spent coffee grounds represent an abundant biomass material with high calorific potential, yet their utilization efficiency depends strongly on processing parameters during pelletization. Knowledge Gap Previous studies have not fully elucidated how compaction pressure and pressing duration affect the physicochemical characteristics of coffee-ground biopellets according to the SNI 8021:2014 standard. Aims This study investigates the effects of varying pressure (500, 750, and 1000 kgf) and pressing duration (30 s and 180 s) on the quality attributes of biopellets composed of 92.5% coffee waste and 7.5% tapioca adhesive. Results Findings indicate that higher pressure and longer pressing duration significantly improve density, reduce moisture and volatile matter, and enhance fixed carbon content, though the ash content remains above the acceptable limit. The optimal combination of 1000 kgf and 180 s produced biopellets meeting the SNI standards for calorific value and bound carbon. Novelty This research provides quantitative insights into the synergistic role of mechanical compaction and pressing time in optimizing biofuel quality from coffee waste. Implications The results support the advancement of circular bioenergy production in Indonesia by transforming coffee waste into high-quality renewable fuel. Highlights: High pressure and longer compression improve biopellet quality. Only 1000 kgf–180 s meets SNI standards for bound carbon and calorific value. High ash content remains the main limitation of coffee waste biopellets. Keywords: Biopellet, Coffee Waste, Pressure, Compression Time, Renewable Energy
The Effect of Solar Panel Output Power Analysis with Reflector Angle Optimization and Addition of Heatsink-Fan Cooling System Suryo, Taufik Hadi; Rhakasywi, Damora; Fahrudin, Fahrudin
Journal of Applied Science, Engineering, Technology, and Education Vol. 5 No. 1 (2023)
Publisher : PT Mattawang Mediatama Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35877/454RI.asci1535

Abstract

The addition of reflectors to solar panels is used to increase the intensity of sunlight received by solar panels so that the electrical power generated by the panels increases. In adding reflectors to solar panels, they must consider various factors to be able to increase the power generated without having a negative effect on solar panels , one of which is providing a cooling system. Therefore, research is needed to increase the power generated by solar panels and cooling systems that are suitable for overcoming rising temperatures due to the addition of reflectors. The study was conducted by varying the glass mirror reflector, aluminum foil reflector, angle of the reflector, and heatsink-fan cooling system. The research method used in this study was to compare 2 solar panel models, namely: solar panels with the addition of glass mirror reflectors / aluminum foil and heatsink-fan cooling systems, and solar panel models without any addition. The results show that the solar panel model with the addition of a glass mirror reflector / aluminum foil can increase the output power according to the angle of the reflector, the highest increase reaching 16.70% in the 450-angled aluminum foil mirror reflector. The heatsink cooling system is considered to be useful for reducing the temperature of solar panels, but the decrease is relatively small below 5%.
Analysis on The Influence of Sollar Irradiation And Rotational Speed of Centrifugal Submersible Pumps Efficiency in Solar Water Pump Systems Technology Shafa, Naura; Rhakasywi, Damora; Fahrudin, Fahrudin
Journal of Applied Science, Engineering, Technology, and Education Vol. 5 No. 2 (2023)
Publisher : PT Mattawang Mediatama Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35877/454RI.asci2070

Abstract

This study aims to analyze the effect of solar irradiation and rotational speed on the efficiency of centrifugal submersible pumps in solar water pump systems. The research was conducted using measuring instruments such as the PS2-4000 Controller on a PATS system with a capacity of 5940 Wp, Autodesk Inventor 2022, Microsoft excel, and Rstudio. The independent variables used were the level of solar irradiation and rotational speed obtained every day for two weeks from 07.00 – 17.00. The dependent variable is obtained from a literature study and the PATS system used. The PATS system uses a LORENTZ PS2-4000 C-SJ17-4 centrifugal submersible pump and a PLTS with a capacity of 5940 Wp with a static head design of 20 m. Data collection was carried out based on actual data taken at the installation location of the PATS system and the velocity triangle analysis approach based on pump geometry. Data collection at the location was carried out using the pump controller PS2-4000 and COMPASS software. Data processing is done using Excel and Rstudio software. The results of data processing will be presented in the form of a curve that explains the relationship between the two or three variables studied. Based on this curve, results and conclusions can be obtained regarding the effect of solar irradiation and rotational speed on the efficiency of centrifugal submersible pumps in solar water pump systems. Data processing is done using Excel and Rstudio software. The results of data processing will be presented in the form of a curve that explains the relationship between the two or three variables studied. Based on this curve, results and conclusions can be obtained regarding the effect of solar irradiation and rotational speed on the efficiency of submersible centrifugal pumps in solar water pump systems. Data processing is done using Excel and Rstudio software. The results of data processing will be presented in the form of a curve that explains the relationship between the two or three variables studied. Based on this curve, results and conclusions can be obtained regarding the effect of solar irradiation and rotational speed on the efficiency of submersible centrifugal pumps in solar water pump systems.
Exergy Analysis and Optimization of Kamojang Geothermal Power Plant Dry Steam Type Capacity 55 MW Kusumo, Rayhan Suryo; Rhakasywi, Damora; 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.
Investigating the Impact of Plain Flap as Lift Enhancement on Symmetrical Airfoils Parluhutan, Yohanes Mangatur; Fahrudin, Fahrudin; Rhakasywi, Damora
International Journal of Marine Engineering Innovation and Research Vol 9, No 1 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i1.19848

Abstract

Symmetric airfoils like NACA 0015 have limitations in generating lift compared to asymmetric airfoils. Therefore, additional devices are needed to overcome this limitation. This research analyzes the use of a lift enhancement device called a plain flap, which is installed on the trailing edge of the NACA 0015 airfoil using the CFD method. Simulations were conducted at a Reynolds number of  using the k-epsilon turbulent model. Three variations of geometry models were simulated: the NACA 0015 airfoil without a flap, the NACA 0015 airfoil with a plain flap at a deflection angle of 15°, and the NACA 0015 airfoil with a plain flap at a deflection angle of 30°. The simulation results show that the use of a flap can increase the maximum lift coefficient (Cl) of the airfoil. Initially, the maximum lift coefficient was 1.15 at an angle of attack (AoA) of 15°. With a plain flap deflection angle of 15°, the maximum lift coefficient increased to 1.5 at an AoA of 13°. With a plain flap deflection angle of 30°, the maximum lift coefficient further increased to 1.71 at an AoA of 10°. However, the use of a plain flap also leads to a significant increase in drag. On average, the drag coefficient (Cd) increased by 65% with a plain flap deflection angle of 15° and by 178% with a plain flap deflection angle of 30°.
Co-Authors Abhitah, Athallah Nabiel Achmad Zuchriadi Amir Marasabessy Armansyah Armansyah Ashfi Rayhan, Fajri Asrianti, Nadia Putri Bambang Sudjasta Bambang Sudjasta Bambang Sudjasta Budhi Martana Christoforus Deberland David, Jerico Dewi, Talitha Cahya Kemala Didit Widiyanto Diraharja, Rifat Satrio Dora Samaria fahrudin Fahrudin Fahrudin Fahrudin, Fahrudin Fajri Ashfi Rayhan Febriana, Miftakhul Jannah Francisco, Jeremi Harinaldi . Imron, Raja Shadam Ali Irga Irga Kusumo, Rayhan Suryo Lina Ayu Marcelina Muhammad Naufal Bari Nur Cholis Nurzati, Syarif Adhika Adhin Pamungkas, Eny Dewi Parluhutan, Yohanes Mangatur Pradana , Sigit Prasetyo, Eko Andi Rachman, Muhammad Nanda Fatur Rita Ismail Rizkiati Ramadhani, Mahirah Salwa Aurelia Ananda Rosidi, Erlia Nurbayti Shafa, Naura Sitorus, Henri BH Sudjasta, Bambang Sulistyawati, Wiwin Suryo, Taufik Hadi Sutarya, Muhamad Farad Teris Ekamila Wiwin Sulistyawati Yuliana Dewi