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All Journal Jurnal MEKANIKAL Jurnal technoscientia ROTOR: JURNAL ILMIAH TEKNIK MESIN Journal of Mechanical Engineering Science and Technology Civil and Environmental Science Journal (CIVENSE) Jurnal Elemen Jurnal IMPACT: Implementation and Action Scientific Journal of Mechanical Engineering Kinematika JTAM ROTARY JURNAL TEKNOLOGI TECHNOSCIENTIA International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Mechanical Engineering for Society and Industry Journal of Mechanical Engineering, Science, and Innovation
Rachmat Subagyo
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Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation Other

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PEMANFAATAN ENERGI SURYA SEBAGAI SUMBER ENERGI LISTRIK ALTERNATIF PADA MUSHOLA NURUL HIKMAH KELURAHAN LOKTABAT UTARA-BANJARBARU UNTUK MENCAPAI GREEN-ENERGY MOSQUE Cahyono, Gunawan Rudi; Subagyo, Rachmat; Ansyah, Pathur Razi; Ramadhan, M. Nizar; Jauhari, Muhammad Firdaus
Jurnal IMPACT: Implementation and Action Vol. 4 No. 1 (2021): Jurnal Impact
Publisher : Politeknik Negeri Banjarmasin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31961/impact.v4i1.1232

Abstract

Indonesia mempunyai potensi energi matahari yang cukup besar, karena terletak didaerah tropis. Energi surya adalah energi yang sangat bersahabat karena tidak bersifat polutif, tidak dapat habis dan gratis. Mushola Nurul Hikmah sebagai salah satu pusat peribadatan yang berada di daerah Kelurahan Loktabat Utara Banjarbaru Utara mempunyai motto pengembangan mushola bernuansa hijau baik dari segi tata letak, tata kelola lingkungan, maupun sumber energi yang digunakan. Dari segi tata kelola dan tata letak lingkungan, pihak pengurus Mushola telah menempatkan taman hijau dan perkebunan hidroponik. Dari segi sumber energi listrik, mereka masih menggunakan sumber utama dari PLN dan genset. Kelemahan genset terkait masalah polusi dan suara yang mengganggu kekhusyuan peribadatan. Pihak pengurus mushola beberapa kali mendapatkan keluhan dari Jamaah terkait dengan suara kebisingan tersebut sehingga sangat diperlukan solusi yang lebih efisien baik dari segi daya maupun polusi yang ditimbulkan. Salah satu teknologi energi yang bisa dimanfaatkan dengan minim polusi udara dan suara adalah teknologi panel surya yang bisa mengkonversi langsung intensitas cahaya matahari menjadi sumber energi listrik alternatif. Hal-hal yang perlu diperhatikan dalam perancangan panel surya adalah: besarnya beban total yang akan digunakan, jumlah Modul yang diperlukan, jenis atau karakteristik Modul yang akan dipilih, posisi lintang lokasi dimana system SHS akan dipasang dan besarnya kapasitas AKI yang diperlukan. Apabila akan dilakukan instalsi secara bertahap sesuai perencanaan anggaran, maka kapasitas daya AKI dan Panel surya seterusnya idealnya harus sama dengan yang sebelumnya sudah terpasang, agar tidak terjadi overcharge dan overload. Dengan mengikuti langkah-langkah perencanaan yang telah diuraikan diatas, maka kesesuaian antara kebutuhan, harga, dan kualitas akan dicapai. Kata kunci: energi surya, beban total, Modul, posisi lintang, kapasitas AKI
Effect of Variation of Mixture (Wood Gelam+Rice Husk) on Bio-Pellet on the Value of Temperature, Rate and Pressure of Combustion Subagyo, Rachmat; Nugraha, Andy; Isworo, Hajar; Pratama, Trendy; Rusdi, M. Zainul
Civil and Environmental Science Journal (CIVENSE) Vol. 5 No. 2 (2022)
Publisher : Fakultas Teknik Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.civense.2022.00502.5

Abstract

The increasing demand for energy causes the depletion of fuel fossil. To overcome this, it is necessary to utilize biomass and biomass waste. The purpose of this study was to simulate the effect of bio-pellet density on temperature, rate and pressure of combustion made from a mixture of gelam wood and rice husk. The method uses ANSYS simulation with literature review. The results showed that the increasing composition of rice husks had an effect on the decreasing combustion rate, this was due to the calorific value of the pellets making up the material. Where the lower calorific value of rice husk has an effect on the rate of combustion. Pellets that have a large density affect the rate of combustion so that it extends the burning time. The density of pellets is influenced by the pressure of pellet molding, the greater the pressure makes the fuel denser and has a large density. The highest combustion air pressure occurs at 100% gelam composition and the lowest at 100% husk composition. This shows that the addition of rice husk composition reduces the combustion pressure and vice versa applies to the addition of gelam composition.
PENGARUH FRAKSI VOLUME DAN SUSUNAN SERAT KOMPOSIT POLYESTER-SERAT ECENG GONDOK TERHADAP NILAI KONDUKTIVITAS TERMAL Akbar Saputera, Muhammad Ilham; Subagyo, Rachmat; Muchsin, Muchsin
JTAM ROTARY Vol 6, No 1 (2024): JTAM ROTARY
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jtam_rotary.v6i1.11111

Abstract

Komposit dibuat dengan menggunakan resin poliester sebagai matriks dan serat eceng gondok sebagai penguat. Dari pengujian nilai konduktivitas yang dilakukan pada komposit serat eceng gondok diperoleh nilai konduktivitas termal tertinggi pada komposisi 15% serat-85% resin dengan variasi acak letak serat sebesar 0,063 W/m°C, disusul serat 20%- Lokasi serat acak resin 80% sebesar 0,060 W/m°C, kemudian disusul serat acak resin 25%-75% lokasi serat acak sebesar 0,050 W/m°C. Untuk komposisi resin 15% serat-85% dengan variasi letak serat sejajar diperoleh nilai sebesar 0,059 W/m°C, disusul resin 20% serat-80% dimana seratnya sebesar 0,056 W/m°C, disusul kemudian dengan 25% fiber-75% resin letak parallel fiber sebesar 0,043 W/m°C Pada pengujian struktur mikro terlihat bahwa semakin bervariasi fraksi volume maka semakin banyak void yang terdapat pada komposit. Nilai konduktivitas termal dan struktur mikro menjadikan komposit serat eceng gondok dapat menjadi referensi terkini sebagai bahan baku furniture atau bangunan yang cukup baik. Composites are made using polyester resin as a matrix and hyacinth fiber as reinforcement. From the testing of conductivity values carried out on the water hyacinth fiber composites obtained the highest thermal conductivity value in the composition of 15% fiber-85% resin with a variation of random fiber location of 0.063 W/moC, followed by 20% fiber-80% resin random fiber location of 0.060 W/m°C, then followed by 25% fiber-75% resin random fiber location of 0.050 W/m°C. For the composition of 15% fiber-85% resin with variations in the location of parallel fibers obtained a value of 0.059 W/m°C, followed by 20% fiber-80% resin where the fiber is equal to 0.056 W/m°C, then followed by 25% fiber-75% resin location parallel fiber of 0.043 W/m°C In testing the microstructure it can be seen that the more varied the volume fraction, the more void that is present in the composite. The value of thermal conductivity and microstructure makes the water hyacinth fiber composite can be the latest reference as a raw material for furniture or buildings that are quite good.
Friction Modeling of Composite Brake Pads with Ulin Wood Powder (Eusideroxylon zwageri) Putra, Muhammad Rezki Fitri; Isworo, Hajar; Yasin, Muhamad Noor; Subagyo, Rachmat
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 8, No 2 (2024)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v8i22024p520

Abstract

This study investigates the performance of composite brake pads made of Ulin (Eusideroxylon zwageri) sawdust using simulation modeling, focusing on the pressure distribution, frictional stress, and contact state in five brake pad designs (DS0 to DS4). The brake pad designs used U-shaped grooves to improve cooling efficiency and debris removal. The results show that DS1 and DS2 exhibit the most uniform pressure distribution, with maximum values of 0.045 MPa and 0.048 MPa, respectively. DS1 recorded the highest peak frictional stress at 2.53 × 10-8 MPa, while DS2 showed consistent stress stability, reducing the possibility of uneven wear. DS3 achieved a balanced performance, with a maximum pressure of 0.062 MPa and a stable frictional stress distribution. In contrast, DS4 showed the highest stress (0.072 MPa) and increased “sliding” contact area, indicating reduced braking efficiency and potential for faster wear. Contact condition analysis showed predominantly “sticky” conditions on DS1, DS2, and DS3, which contributed to effective braking performance, while DS4 exhibited significant “sliding” conditions, which reduced friction efficiency. These findings confirm the potential of Ulin sawdust as an environmentally friendly brake lining material, with DS1 and DS2 emerging as the most suitable designs to achieve optimal braking performance and long life.
Utilization of rice husk ash waste and scrap aluminum as composite materials fabricated by evaporative casting Siswanto, Rudi; Subagyo, Rachmat; Tamjidillah, Mastiadi; Mahmud, Mahmud; Setiawan, Sigit Aji
Mechanical Engineering for Society and Industry Vol 4 No 2 (2024)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.12505

Abstract

To achieve environmental sustainability, the integration of waste materials into new production processes is essential. This study investigates the development of aluminum matrix composites (AMCs) reinforced with rice husk ash (RHA) using the evaporative casting method. This study focuses on the effects of aluminum scrap-RHA composition, casting temperature, and styrofoam pattern thickness on key physical and mechanical properties such as fluidity length, surface roughness, hardness, and porosity. The composite material from aluminum scrap electrical cables and rice husk ash was heated in a furnace at a temperature of 900 °C for 2 hours with a sieve size of 200 mesh. The pattern material is styrofoam from electronic equipment packaging. The molding sand used is local silica sand with a sieve size of 60 mesh. The melting furnace uses a crucible furnace type with used oil as fuel. The independent variables were Al-RHA composition (100:0, 95:5, 90:10) %, pouring temperature (650 °C, 700 °C, and 750 °C), and Styrofoam pattern thickness (1, 2, 3, 4, 5, 6, and 10) mm. The results showed that the pouring temperature and the composition ratio of Al-RHA affected the fluidity length, surface roughness, hardness, and porosity, showcasing the potential of using waste materials in cost-efficient and environmentally sustainable composites for various industries.
Analysis of the Effect of Delay Time and Type of Coolant Media with the Spray Method on the Back Surface of PV Panel Ansyah, Pathur Razi; Hartoyo, Muhammad Hendrawan Septian; Budianto, Akhmad Ghiffary; Cahyono, Gunawan Rudi; Subagyo, Rachmat
Journal of Mechanical Engineering, Science, and Innovation Vol 4, No 2 (2024): (October)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2024.v4i2.6440

Abstract

Sunlight can be harnessed as a clean and renewable energy source using solar cells and the photovoltaic process. However, relying on direct sunlight exposure can increase solar cell temperatures and negatively impact performance. This research aims to maintain cell efficiency by exploring the effectiveness of spraying coolant media on the bottom surface of panels through three timed intervals (10, 20, and 30 minutes) using three different media (A, B, and C). Each spray application lasts for 1 minute. Analyzing the test results with Minitab18 software with full factorial design will identify the most effective treatment for maintaining performance. Based on the results of the experimental test, coolant A with a 10-minute delay spraying time has a maximum power of 52.89 Watts, a temperature of 48oC, and an efficiency of 5.69%. Response Optimization using Design of Experiment (DOE) Full Factorial shows an optimal response with coolant A and a 10-minute delay spraying time with the lowest temperature at 49.3oC, maximum output power at 46.87 Watts, and efficiency at 5.61%. Moreover, Tukey Krammer test result provides an information about 10-minute delay spraying time has a better performance to reduce the PV panel temperature compared to 30-minute delay spraying time by 3.94 oC.
Green Algae to Green Fuel: Optimizing the Composition of Bio-Oil Additive Mixture from the Pyrolysis Process and RON 90 for Enhanced Engine Performance Amrullah, Apip; Irawansyah, Herry; Ghofur, Abdul; Subagyo, Rachmat; Mahmud, Rizal; Farobie, Obie
Journal of Mechanical Engineering, Science, and Innovation Vol 4, No 2 (2024): (October)
Publisher : Mechanical Engineering Department - Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jmesi.2024.v4i2.6487

Abstract

This study explores the optimization of bio-oil additives derived from the pyrolysis of Ulva lactuca algae, blended with RON 90 gasoline to enhance engine performance and reduce emissions. Addressing the urgent need for sustainable energy, the research focuses on a relatively unexplored area—using algae-derived bio-oils in gasoline engines. The study aimed to identify the optimal blend ratio of bio-oil and gasoline to improve engine metrics such as brake specific fuel consumption (BSFC), thermal efficiency, and volumetric efficiency, while minimizing emissions like CO, CO2, and NOx. Experiments were conducted with bio-oil blended at 5%, 10%, and 15% by volume with RON 90 gasoline in a single-cylinder gasoline engine. Results showed that increasing bio-oil concentration led to improved fuel efficiency and thermal efficiency, along with significant reductions in CO and HC emissions. However, NOx emissions presented a complex trend, increasing at lower bio-oil ratios but decreasing significantly at the highest concentration. These findings suggest that algae-derived bio-oil can effectively enhance gasoline engine performance and reduce environmental impact, offering a novel, sustainable alternative fuel option. The study underscores the importance of optimizing blend ratios to maximize benefits and manage emissions, contributing valuable insights to sustainable energy research.
Influence of Mixture Composition Between Soybean Oil and Diesel Fuel on Characteristic of Droplets Combustion Subagyo, Rachmat; Ansyah, Pathur Razi; Aminanto, Robbi Sholaiman
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 1 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.01.7

Abstract

Depleting oil reserves has encouraged many researchers to search for new energy resources. Of many alternatives, soybean oil has been proposed as biodiesel. In this study, influence of mixture composition of soybean oil and diesel fuel on the droplet combustion characteristics was investigated. These characteristics included Ignition delay time, fire visualization, flame temperature and burning rate. The mixture comprises 10 to 50% soybean oil while the rest are Pertamina Dex diesel fuel. The study shows that flash point temperature, ignition delay time and burning rate increase as soybean oil content increases. In contrary, the flame height decreases with increasing soybean oil content.
Influence of Mixture Composition Between Soybean Oil and Diesel Fuel on Characteristic of Droplets Combustion Subagyo, Rachmat; Ansyah, Pathur Razi; Aminanto, Robbi Sholaiman
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 1 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.01.7

Abstract

Depleting oil reserves has encouraged many researchers to search for new energy resources. Of many alternatives, soybean oil has been proposed as biodiesel. In this study, influence of mixture composition of soybean oil and diesel fuel on the droplet combustion characteristics was investigated. These characteristics included Ignition delay time, fire visualization, flame temperature and burning rate. The mixture comprises 10 to 50% soybean oil while the rest are Pertamina Dex diesel fuel. The study shows that flash point temperature, ignition delay time and burning rate increase as soybean oil content increases. In contrary, the flame height decreases with increasing soybean oil content.
Co-Authors -, Muchsin -, Muchsin Abdul Ghofur Abdul Ghofur Akbar Saputera, Muhammad Ilham Akhmad Ghiffary Budianto Aminanto, Robbi Sholaiman Andrie Yeremia Marchelino Simanjuntak Andy Nugraha Apip Amrullah Arry Eko Pristiwanto Asep Mohamad Aulia, Rezky Aulia, Rezky Eko Siswanto Fahron Anwar Gunawan Rudi Cahyono Hartoyo, Muhammad Hendrawan Septian I Komang Gede Sastrawan I.N.G. Wardana Irawansyah, Herry Isworo, Hajar Ma'ruf Ma'ruf Mahmud Mahmud Mahmud, Rizal Maruf Maruf Mastiadi Tamjidillah, Mastiadi Muchsin Muchsin Muhamad Noor Yasin Muhammad Firdaus Jauhari, Muhammad Firdaus Muhammad Ibnu Candra Muhammad Rusdieanoor Obie Farobie Pathur Razi Ansyah Pratama, Trendy Putra, Muhammad Rezki Fitri Ramadhan, M. Nizar Riyan Nur Hidayah Riza Mahmud Nugroho Rudi Siswanto, Rudi Rusdi, M. Zainul Setiawan, Sigit Aji