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Utilization of Cassava Peel (Manihot utilissima) Waste as an Adhesive in the Manufacture of Coconut Shell (Cocos nucifera) Charcoal Briquettes Bayu Rudiyanto; Intan Rida Agustina; Zeni Ulma; Dafit Ari Prasetyo; Miftah Hijriawan; Bambang Piluharto; Totok Prasetyo
International Journal of Renewable Energy Development Vol 12, No 2 (2023): March 2023
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2023.48432

Coconut shells and waste cassava peels could be used as the main raw material for biomass briquettes for alternative energy sources in Indonesia. This study aims to analyze the quality of briquettes based on a coconut shell and cassava peel adhesive through proximate analysis with three treatment ratio variations. The ratio of coconut shell to cassava peel used varied from V1 (75%:25%), V2 (70%:30%), and V3 (65%:35%). Based on the result, the charcoal briquettes produced have a density of 0.61 gram/cm³-0.66 gram/cm³, water content of 5.51%-7.85%, ash content of 1.50%-2.86%, combustion rate of 0.021 gram/s-0.026 gram/s, and the calorific value of 6,161 cal/gram-6,266 cal/gram. However, all the treatment variations appropriate the SNI 01-6235-2000, the national standard of Indonesia for the quality of charcoal briquette, which includes the calorific value (>5,000 cal/gram), moisture content (<8%), and ash content (<8%). Briquettes with the best quality were generated by V1 with a density of 0.66 gram/cm³, water content of 5.51%, ash content of 1.50%, combustion rate of 0.026 gram/s, and calorific value of 6,266 cal/gram. Furthermore, briquette material from the coconut shell waste with natural cassava peel adhesive can be feasible as an alternative fuel.

Utilization of Cassava Peel (Manihot utilissima) Waste as an Adhesive in the Manufacture of Coconut Shell (Cocos nucifera) Charcoal Briquettes Bayu Rudiyanto; Intan Rida Agustina; Zeni Ulma; Dafit Ari Prasetyo; Miftah Hijriawan; Bambang Piluharto; Totok Prasetyo
International Journal of Renewable Energy Development Vol 12, No 2 (2023): March 2023
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2023.48432

Coconut shells and waste cassava peels could be used as the main raw material for biomass briquettes for alternative energy sources in Indonesia. This study aims to analyze the quality of briquettes based on a coconut shell and cassava peel adhesive through proximate analysis with three treatment ratio variations. The ratio of coconut shell to cassava peel used varied from V1 (75%:25%), V2 (70%:30%), and V3 (65%:35%). Based on the result, the charcoal briquettes produced have a density of 0.61 gram/cm³-0.66 gram/cm³, water content of 5.51%-7.85%, ash content of 1.50%-2.86%, combustion rate of 0.021 gram/s-0.026 gram/s, and the calorific value of 6,161 cal/gram-6,266 cal/gram. However, all the treatment variations appropriate the SNI 01-6235-2000, the national standard of Indonesia for the quality of charcoal briquette, which includes the calorific value (>5,000 cal/gram), moisture content (<8%), and ash content (<8%). Briquettes with the best quality were generated by V1 with a density of 0.66 gram/cm³, water content of 5.51%, ash content of 1.50%, combustion rate of 0.026 gram/s, and calorific value of 6,266 cal/gram. Furthermore, briquette material from the coconut shell waste with natural cassava peel adhesive can be feasible as an alternative fuel.

Performance Test of Airbus A380-like using GAMA Water Tunnel and Numerical Approach Syafria Wildan Hadi; Fauzun; Ata Syifa' Nugraha; Feri Hidayatulloh; Hijriawan, Miftah
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.7159

This study investigates the aerodynamic characteristics of the Airbus A380 model using a combination of water tunnel experimentation and Computational Fluid Dynamics (CFD) analysis. The research aims to analyze the relationship between the angle of attack (AOA) and the resulting lift and drag coefficients, providing insights into aerodynamic performance at low-speed flow conditions. Experiments were conducted using the GAMA Water Tunnel with a 1:416 scaled model of the A380. Lift and drag forces were measured using a load-cell sensor connected to an Arduino microcontroller, while CFD simulations were performed using Computational Fluid Dynamics (CFD) with the k–ω SST turbulence model. The simulation and experimental results were compared to validate the numerical approach. The findings show that both lift and drag coefficients increase with AOA up to a critical point, beyond which stall occurs at approximately 14°. The CFD results closely align with the experimental data, demonstrating strong agreement between the two methods. This research validates the reliability of water tunnel testing for aerodynamic studies and contributes to the development of cost-effective experimental methodologies for aircraft performance evaluation.

Pembuatan Kontur Permukaan Piston Diameter 50 mm, Tinggi 15 mm, AA 2618 Kapasitas 2 Buah/Jam Ata Syifa’ Nugraha; Syamsul Hadi; Miftah Hijriawan; Feri Hidayatulloh; Syafria Wildan Hadi
Automotive Innovations Journal Online First
Publisher : Department of Automotive Engineering Technolgy

Show Abstract | Download Original | Original Source | Check in Google Scholar

Kurangnya turbulensi dalam pencampuran antara udara dan bahan bakar di ruang bakar silinder mesin Otto 4 langkah 100 cm3 sebagai permasalaanh yang dihadapi. Tujuan pembuatan untuk mendapatkan kontur permukaan piston diameter 50 mm, tinggi 15 mm dari bahan AA 2618. Metode pembuatan meliputi: desain kontur permukaan piston; percobaan dengan beberapa bentuk kontur pada dampak turbulensi (coba-coba) dan analisis data; pemilihan bahan piston dari AA2618 dengan diameter 50 mm dan tinggi 15 mm; perbandingan hasil daya dari hasil berbagai bentuk kontur dari penelitian sebelumnya; pembuatan kontur bergelombang dari arah katup masuk ke arah katup buang dengan tinggi bukit 0,2 mm dan kedalaman lembah 0,2 mm menggunakan mesin CNC milling berjarak antar bukit 3,5 mm; percobaan pembakaran di dalam silinder dengan perbandingan hasil daya antara dengan dan tanpa kontur permukaan piston; pemeriksaan mutu-dimensi permukaan kontur piston. Hasil pembuatan berupa kontur permukaan piston diameter 50 mm, tinggi 15 mm dari bahan AA 2618 dengan permukaan kontur bergelombang berukuran tinggi bukit 0,2 m dan kedalaman lembah 0,2 mm dari arah katup masuk ke katup buang dengan total biaya pembuatan Rp 100.000/unit, dan durasi produksi 30 menit/unit yang berkonsekwensi bahwa daya motor 100 cm3 dapat meningkat sekitar 12%.

Pot Skirt Configuration on the UB-03 Biomass Stove: Taguchi Approach Optimization Bayu Rudianto; Maghriza Iskhak; Dedy Eko Rahmanto; Miftah Hijriawan
Jurnal Ilmiah Rekayasa Pertanian dan Biosistem Vol 12 No 2 (2024): Jurnal Ilmiah Rekayasa Pertanian dan Biosistem
Publisher : Fakultas Teknologi Pangan & Agroindustri (Fatepa) Universitas Mataram dan Perhimpunan Teknik Pertanian (PERTETA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jrpb.v12i2.641

A biomass stove is a technology that can utilize biomass fuel as an alternative energy source. This stove is considered effective for saving fossil energy because it uses fuels such as wood, waste, and plants so that it can reduce the effects of global warming because it can minimize the emissions it produces. In its technological development, UB-03 is a biomass stove product with compact construction and affordable prices for rural communities. However, there needs to be an increase to produce more efficient performance. In this case, additional configurations in the form of a pot skirt can be used to increase the efficiency of the biomass stove. The pot skirt is a device that focuses the fire’s direction on the load to minimize wasted heat and increase the efficiency of the biomass stove. This study used the Water Boiling Test (WBT) method for experimental testing. In addition, the Taguchi method was used to analyze the data obtained. This study aims to determine the optimum conditions of the biomass stove with the addition of a pot skirt using the Taguchi method with orthogonal array L9 (33) with three factors, namely angle (64°, 65°, 66°), number of holes (9,10,11) and hole diameter (0.8 cm, 1 cm, 1.2 cm). The results of this study indicate that the optimal configuration obtained is by adding a pot skirt at an angle of 65° with 9 holes and a hole diameter of 1 cm, where the highest efficiency value is obtained, namely 21.19%.

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