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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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IMPLEMENTASI BRANDING KAMPUNG CIGUNDI DESA MEKARAGUNG LEBAK BANTEN SEBAGAI DESA WISATA TANI BERBASIS TEKNOLOGI INFORMASI Zuchriadi, Achmad; Rhakasywi , Damora; Sitorus, Henri BH
Nemui Nyimah Vol. 1 No. 1 (2021): Nemui Nyimah
Publisher : FT Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/nm.v1i1.4

Abstract

Kampung Cigundi di Desa Mekaragung Lebak Banten yang mayoritas warganya berprofesi sebagai petani memiliki suatu keunikan, yaitu adanya kolaborasi antara suami dan istri dalam upaya peningkatan perekonomian keluarga dimana para suami tergabung dalam Kelompok Tani Surya Tani (KST), kelompok tani yang memanfaatkan lahan untuk bercocok tanam khususnya menanam singkong. Sedangkan para istri dan anak-anak tergabung dalam Kelompok Wanita Tani (KWT) Pagoda yang memanfaatkan singkong hasil panen para suami menjadi produk unggulan kripik enye-enye. Kerjasama unik ini berpotensi menjadikan Kampung Cigundi sebagai Desa Wisata Tani. Sayangnya keunikan dan informasi tentang keberadaan Kampung Cigundi sangat minim baik secara fisik seperti petunjuk arah maupun non fisik seperti di mesin pencari Google. Kegiatan Pengabdian Masyarakat ini bertujuan melakukan Branding Kampung Cigundi sebagai Desa Wisata Tani berbasis teknologi informasi dengan membuat website dan media sosial Facebook dan Instagram Kampung Cigundi agar informasi keunikan dan keberadaan Kampung Cigundi mudah ditemukan di mesin pencari Google. Pada akhir kegiatan Pengabdian Kepada Masyarakat ini, website dan media sosial Facebook dan Instagram Kampung Cigundi telah masuk halaman pertama pencarian google dengan kata kunci kampung cigundi.
PELATIHAN PERAWATAN ZONA LAMBUNG PERAHU IKAN BERBAHANKAYU BAGI KELOMPOK NELAYAN DESA LONTAR KECAMATAN TIRTAYASA KABUPATEN SERANG Marasabessy, Amir; Sudjasta, Bambang; Rhakasywi, Damora
Nemui Nyimah Vol. 1 No. 2 (2021): Nemui Nyimah
Publisher : FT Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/nm.v1i2.12

Abstract

Pengabdian kepada masyarakat sangat membantu bagi kehidupan masyarakat untuk memperbaiki taraf kehidupan perekonomian agar bisa menjadi sejahtera. Kehidupan masyarakat Desa Lontar lebih didominasi oleh mitra kelompok nelayan dengan jumlah 1327 orang dan petani rumput laut 1021 orang. Hasil produksi penangkapan ikan dapat dikatakan belum maksimal jika dibandingkan dengan luas perairan 11.134,224 Km2 dan panjang garis pantai 517,42 Km. Saat ini mata pencaharian masyarakat Desa Lontar sebagian besar sebagai nelayan yang setiap hari mencari ikan untuk memenuhi kebutuhan hidup, perahu ikan yang digunakan berbahan kayu dengan kondisi phisik 40-50 % telah mengalami degradasi, dengan jumlah perahu ikan ± 100 unit. Aspek penting yang mendapat perhatian adalah sebagian besar perahu ikan tidak melaut karena sering terjadi kerusakan/kebocoran zona lambung ± 3 – 4 kali dalam setahun. Tujuan pelaksanaan PKM adalah memberikan pelatihan perawatan zona lambung perahu ikan berbahan kayu menggunakan bahan fiberglass. Metode yang digunakan adalah pendampingan pelatihan dengan melibatkan mitra kelompok nelayan, sebagai upaya transfer ilmu dan teknologi perawatan zona lambung perahu ikan berbahan kayu secara aplikatif. Hasil dari kegiatan Program Kemitraan Masyarakat, mitra kelompok nelayan dapat melakukan perawatan zona lambung perahu ikan secara mandir/kelompoki untuk menghindari kerusakan/kebocoran dan mempertahankan kekuatan zona lambung guna kelancaran dan keselamatan mencari ikan di laut.
The Effect of Cover Glass Thickness on the Performance of Box-Type Solar Cookers: Pengaruh Ketebalan Kaca Penutup Terhadap Performa Kompor Surya Tipe Kotak Muhammad Naufal Bari; Damora Rhakasywi; Fahrudin
R.E.M. (Rekayasa Energi Manufaktur) Jurnal Vol 10 No 2 (2025): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/r.e.m.v10i2.1787

Abstract

Kompor surya memiliki potensi dalam pemanfaatan energi Surya di bidang peralatan rumah. Pancaran energi yang tidak bisa dikendalikan oleh manusia menjadikan komponen kompor yang digunakan harus dibuat optimal agar memanfaatkan energi secara maksimal. Penelitian ini membandingkan performa kompor surya ketika menggunakan ketebalan kaca penutup yang berbeda, yaitu 3mm, 5mm, 8mm. Metode yang digunakan adalah uji coba lapangan dengan kondisi stagnan dan beban memasak air 1kg. Hasil dari penelitian ini adalah penggunaan kaca ketebalan 5 mm menghasilkan suhu maksimal tertinggi, yaitu 148,25 oC dibanding ketebalan 3 mm dan 8 mm, yang masing masing mendapatkan angka 124,25 oC dan 109,5 oC pada kondisi tanpa beban, sedangkan uji coba masak menghasilkan suhu maksimal 98 oC pada 3mm, 101,25 oC pada 5mm, dan 79,5 oC pada 8mm
Analysis of Cooling Load Performance with CLTD Method Case Study: Al-Furqon Mosque Dewanto, Ramadhan Haryo; Fahrudin; Rhakasywi, Damora
Piston: Journal of Technical Engineering Vol. 9 No. 2 (2026)
Publisher : Program Studi Teknik Mesin Universitas Pamulang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v9i2.56548

Abstract

Thermal comfort in worship spaces is an important aspect that affects the quality of religious activities. However, intermittently occupied worship spaces, such as mosques during Jummah prayers, often experience spikes in heat load due to the accumulation of sensible and latent heat from occupants and solar radiation. This study aims to analyze the actual cooling load and determine the cooling load required to achieve a comfortable room temperature based on the Cooling Load Temperature Difference (CLTD) method. Temperature measurements were taken using data loggers at one outdoor point and nine indoor points during five Fridays between October 10 and November 7, 2025, from 11:00 a.m. to 1:00 p.m. Western Indonesian Time. Cooling load calculations were based on occupancy variations of 100, 300, and 600 people and comfort temperature targets of 23°C, 25°C, and 27°C. The results showed that the temperature in the worship hall was well above the thermal comfort limit. The actual cooling load increased significantly between 12:00 p.m. and 1:00 p.m. WIB and during peak occupancy, reaching a peak load of 570,116.3 Btu/h. To achieve a comfortable room temperature, the cooling capacity needs to be increased by 8–35%. The final capacity recommendation based on the measurements and ASHRAE standards ranges from 44–69 TR. It can be concluded that the cooling system of Al-Furqon Mosque is currently under capacity and requires increased capacity and adaptive operational strategies to achieve thermal comfort in intermittently occupied worship spaces in a tropical climate.
Investigating the Impact of Plain Flap as Lift Enhancement on Symmetrical Airfoils Yohanes Mangatur Parluhutan; Fahrudin Ulwani; Damora Rhakasywi
International Journal of Marine Engineering Innovation and Research Vol. 9 No. 1 (2024)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i1.5050

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°.
The Influence of Wet Scrubber on the Performance Efficiency of Heat Exchanger at Gasification Based Waste to Energy Power Plants Regina N. Lumbantoruan; Damora Rhakasywi; Fahrudin; Fazli Iqbal Pasha; Putty Fauthyda Z. H.; Firmansyah
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 4 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i4

Abstract

This research investigates the influence of wet scrubber installation on the performance efficiency of a shell and tube heat exchanger operating in a gasification-based Waste-to-Energy (WtE) power plant located in Surakarta, Indonesia. The study was conducted using a quantitative comparative approach over a four-month operational period, comparing system performance before and after the application of a wet scrubber. Three key parameters such as heat exchanger effectiveness, fouling factor, and pressure drop were analyzed to determine the impact of the gas cleaning system on thermal performance. The results show that the fouling factor decreased from 0.003 to 0.002 J/h·m²·°C, indicating cleaner heat transfer surfaces. Meanwhile, the pressure drop on the tube side reduced from 130.374 Pa to 46.134 Pa, reflecting smoother gas flow and lower mechanical resistance. Consequently, heat exchanger efficiency increased dramatically from 34% to 83%, signifying a substantial improvement in heat transfer capability. These findings confirm that the wet scrubber effectively minimizes tar and fine particulate deposits in syngas, improving heat transfer efficiency, operational stability, and equipment lifespan. The integration of wet scrubbers is therefore proven to be a vital enhancement for optimizing gas cleaning and energy conversion processes in Waste-to-Energy systems.
Experimental Investigation of the Municipal Solid Waste Characteristics for a Gasification Based Waste-to-Energy Power Plants Fazli Iqbal Pasha; Damora Rhakasywi; Nicky Yongkimandalan; Regina N. Lumbantoruan; Z. H. Putty Fauthyda; F. Firmansyah; Anisa Rahmah Kusuma; Rizki Apriza
International Journal of Marine Engineering Innovation and Research Vol. 10 No. 4 (2025)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v10i4

Abstract

This study experimentally characterizes Municipal Solid Waste (MSW) feedstock to assess its suitability for gasification-based Waste-to-Energy (WtE) systems. Ten samples from different urban collection sites underwent thorough analysis using standardized ultimate and proximate methods, alongside bomb calorimetry on a dry basis, which helped to ensure the results accuracy. A strong positive correlation was observed between carbon and hydrogen content and gross calorific value, while oxygen, nitrogen, sulphur, and ash content exhibited a negative correlation with calorific potential. Notably, plastics and complex waste yielded the highest gross calorific values, around 30,000 kJ/kg and 31,600 kJ/kg, respectively, while high-ash content fractions recorded the lowest values at about 6,600 kJ/kg. The presence of volatile matter and fixed carbon positively impacts energy release, whereas ash dilutes fuel quality and increases heat absorption during combustion. The study suggests that pretreatment strategies, such as moisture reduction, ash fraction removal, and selective sorting for hydrocarbon-rich materials, effectively enhance fuel quality for gasification and reduce nitrogen and sulphur emission risks. The data reveal significant variability among different waste fractions, indicating that effective feedstock management and reactor design must address compositional heterogeneity to ensure reliable gasification performance.
Numerical Study of Fillet Effects on Cavitation Development in Double Contraction Pipes Daris Naufal, Ridwan; Rhakasywi, Damora; 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

Analysis of Biopellets from a Mixture of Coffee Grounds and Sawdust as an Alternative Energy Source: Analisis Biopelet Dari Campuran Ampas Kopi dan Serbuk Gergaji Sebagai Sumber Energi Alternatif Muhamad Farad Sutarya; Damora Rhakasywi; Fahrudin Fahrudin
Academia Open Vol. 10 No. 2 (2025): December
Publisher : Universitas Muhammadiyah Sidoarjo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21070/acopen.10.2025.12889

Abstract

Background: Indonesia’s growing energy demand and dependence on fossil fuels necessitate renewable alternatives such as biomass-based biopellets. Specific Background: Coffee grounds and sawdust are abundant organic wastes with complementary thermal and mechanical properties suitable for pelletization. Knowledge Gap: However, limited studies have clarified how varying proportions of these materials influence biopellet quality relative to SNI 8021:2020 standards. Aims: This study evaluates the effects of four ratios of coffee grounds–sawdust mixtures (80:20, 70:30, 60:40, 50:50) on physical and proximate characteristics of biopellets. Results: One-way ANOVA and Tukey HSD (p < 0.05) showed significant differences across all parameters. Formulations A and B produced the highest calorific values (4674–4689 cal/g) meeting SNI requirements, while B achieved the highest density (560.34 kg/m³). Moisture and ash contents also met standards; however, density and fixed carbon fell below SNI thresholds due to the absence of torrefaction. Novelty: This study demonstrates that optimizing coffee grounds–sawdust mixtures alone cannot meet all quality indicators without thermal pretreatment. Implications: Incorporating torrefaction and enhanced pressing conditions is essential to improve energy density and combustion stability, supporting the development of high-quality waste-based biofuel in Indonesia. Highlights: The optimal calorific value is achieved with higher proportions of coffee grounds (80:20 and 70:30). Density and fixed carbon remain below SNI standards due to the absence of torrefaction. Thermal pretreatment is essential to improve combustion stability and overall pellet quality. Keywords: Biopellet, Coffee Grounds, Sawdust, Biomass Energy, Torrefaction
Comparative Study of Secant Method and Newton-Raphson Method in Finding the Molar Volume Value of Gas Using Python Juwariyah, Tatik; Rhakasywi, Damora; Janan, Syifaul; Melati, Asih
Indonesian Journal of Education and Mathematical Science Vol 7, No 2 (2026)
Publisher : Universitas Muhammadiyah Sumatera Utara (UMSU)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/ijems.v7i2.29468

Abstract

Determining the molar volume of a real gas requires solving the nonlinear Van der Waals equation. This study aims to compare the efficiency and accuracy of the Newton-Raphson method and the Secant method in solving the Van der Waals equation using the Python programming language. The case study examines the determination of the molar volume of methane gas at a pressure of 56 atm and a temperature of 450 K. The comparison parameters used are the number of iterations and the speed of convergence with an error tolerance of 10⁻⁷. The results show that the Newton-Raphson method requires fewer iterations, namely 4, with a computational time of 0.00012 s. In contrast, the Secant method requires more iterations, namely 6, and a computational time of 0.00015 s. The Newton-Raphson method is less practical because it necessitates the calculation of the derivative of the function, whereas the Secant method is more practical for application in Python scripts as it only requires the calculation of the Van ders Waals equation function.
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