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Arirohman, Ilham Dwi
Institut Teknologi Sumatera
Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Nursing Public Health Other

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Desain dan Analisis Mesin Press Komposit Kapasitas 20 Ton Muhammad Syaukani; Fajar Paundra; Fitrah Qalbina; Ilham Dwi Arirohman; Putty Yunesti; Sabar Sabar
Journal of Science, Technology, and Visual Culture Vol 1 No 1 (2021): Juli 2021
Publisher : Jurusan Teknologi Produksi dan Industri, Institut Teknologi Sumatera

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Abstract

Composite is a combination of several or more different materials, which produce better properties than their composition properties. The process of making composites can be done with a pressing method which can reduce voids. This pressing method can use a hydraulic press machine. This study aims to design and analyze a hydraulic press machine with a capacity of 20 tons. The design process begins with designing a 3D model using Solidwork Software. Numerical simulation using the finite element method by providing several variations in pressure loads ranging from 5-20 MPa. The results of the analysis show that the maximum von Mises stress is 79.70 MPa with a maximum deformation of 0.0176 mm and the smallest value of safety factor is 2.595. Based on these results, the press machine design is claimed to be safe to operate.
Studi Karakteristik Pola Aliran Stratified pada Pipa Horizontal 16 mm Ilham Dwi Arirohman; Fajar Paundra; Putty Yunesti
Journal of Science, Technology, and Visual Culture Vol 1 No 1 (2021): Juli 2021
Publisher : Jurusan Teknologi Produksi dan Industri, Institut Teknologi Sumatera

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Abstract

The main objective of this research is to find information about the characteristics of air-water stratified flow in a small horizontal pipe. Experimentally, the characteristics of horizontal co-current stratified flow in 16 mm diameter and 10 m long acrylic pipe were investigated by using conductance method and visual method. The study parameter in the form of liquid film thickness measured using a developed parallel wire sensor is supported by visual data taken using a high speed video camera in the fully developed area (180-210D). In order to obtain observations covering all stratified flow subpatterns, a variation of the superficial velocity of water (JL) from 0.01 – 0.1 m/s and the superficial velocity of air (JG) from 4 – 20 m/s were chosen. The observed flow sub-patterns are then mapped in a flow sub-pattern map based on variations in the superficial velocity of air and water, adding the database from previous studies. In addition, it is also known that the average liquid film thickness decreases as JG increases but it increases as JL increases, while the interfacial wave velocity increases with increasing JG and JL.
Perencanaan Instalasi Penerangan Jalan Umum Tenaga Surya di Kampung Agrowidya Wisata, Rajabasa Jaya Arirohman, Ilham Dwi; Yunesti, Putty; Wicaksono, Rihardian Maulana; Harahap, Al Barra; Miranto, Afit
TeknoKreatif: Jurnal Pengabdian kepada Masyarakat Vol 3 No 1 (2023): TEKNOKREATIF : Jurnal Pengabdian kepada Masyarakat
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LP2M), Institut Teknologi Sumatera, Lampung, Indonesia.

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/teknokreatif.v2i2.712

Abstract

Kampung Agrowidya merupakan salah satu desa wisata agro berbasis pertanian dan perikanan yang berlokasi di Rajabasa Raya, namun memiliki kondisi penerangan yang minim pada jalan utama. Berdasarkan kondisi penerangan pada kampung Agrowidya, penelitian ini dilakukan untuk meningkatkan keamanan lingkungan dan menunjang aktivitas masyarakat kampung Agrowidya dengan memanfaatkan tenaga surya. Proses perencanaan pemasangan penerangan jalan umum (PJU) dilakukan dengan pengukuran iluminansi dan dimensi jalan utama serta melakukan pemodelan menggunakan 3 untuk menemukan model penerangan yang sesuai dengan kebutuhan. Hasil opsi pemodelan yang paling efisien berdasarkan SNI 7391:2008 menggunakan software DIAlux diperoleh bahwa jenis lampu LED BRP130 dengan tinggi tiang 5 meter dan sudut kemiringan 15o serta panel surya sebagai sistem suplai listriknya yang berkapasitas 210 Wp dan media penyimpanan energi berupa baterai 140Ah. Diharapkan pemanfaatan dan perancangan panel surya pada penerangan jalan umum ini dapat membantu Kampung Agrowidya dan meningkatkan pemahaman pemahaman masyarakat mitra terhadap pemanfaatan energi surya sebagai salah satu energi baru terbarukan.
PENGARUH VARIASI JUMLAH BLADE TERHADAP PERFORMA HORIZONTAL AXIS WIND TURBINE MENGGUNAKAN QBLADE Syaukani, Muhammad; Sadono, Fajar Sidik; Arirohman, Ilham Dwi; Alfian, Devia G. C; Muhyi, Abdul; Ammar, Naufal
SINERGI POLMED: Jurnal Ilmiah Teknik Mesin Vol. 5 No. 1 (2024): Edisi Februari
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/sinergipolmed.v5i1.1492

Abstract

Perubahan iklim mendorong kita untuk dapat melakukan transisi dari energi konvesional ke energi baru terbarukan (EBT). Energi angin merupakan salah satu dari sekian banyak jenis energi terbarukan yang dapat dimanfaatkan menggunakan wind turbine. Wind Turbine diklasifikasikan menjadi Horizontal Axis Wind Turbine (HAWT) dan Vertical Axis Wind Turbine (VAWT). Penelitian ini bertujuan untuk mengetahui performa Horizontal Axis Wind Turbine (HAWT) terhadap variasi jumlah bilah  3, 5 dan 7. Pemodelan dan analisis menggunakan Q-Blade untuk memperoleh parameter perfoma seperti Coefficient of Performance (Cp), Daya mekanik, dan Torsi.  Desain bilah HAWT menggunakan airfoil tipe NACA4412 dan panjang 1.2 m pada kecepatan angin 10 m/s dan TSR 7. Hasil Penelitian menunjukkan bahwa performa terbaik pada  TSR 7 adalah HAWT dengan jumlah 3 bilah dengan Cp, torsi, dan daya mekanik tertinggi secara berurutan yaitu 0,46; 21,89 Nm; 1,28 kW.
EVALUASI KINERJA GENERATOR AC SEDERHANA SECARA EKSPERIMEN BERDASARKAN VARIASI KECEPATAN PUTARAN DAN DIAMETER KAWAT Syaukani, Muhammad; Syah, Muhammad Aksel; Arirohman, Ilham Dwi; Afisna, Lathifa Putri; Pujiyulianto, Eko
Jurnal Teknologi Terapan Vol 11, No 1 (2025): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v11i1.786

Abstract

Small-scale renewable energy use is crucial for supplying the world's electrical needs. Utilizing these renewable energy sources requires a device that can transform mechanical power into electrical power. The purpose of this research is to construct a simple AC generator by converting mechanical power into electricity by varying the copper wire's diameter and rotational speed. The outcomes of the investigation include information on the electrical power, torque, mechanical power, and efficiency of the generator. The technical details of the generator employed are 12 poles, a rotor diameter of 9.25 cm, and a stator diameter of 9 cm. The results of the investigation reveal that the generator with the 0.15 mm variation in copper wire diameter performs better than the generators with the 0.75 mm variation in wire diameter. It can generate 80,6 watts of electric power, 1,231 N.m. of torque, 193,468 watts of mechanical force, and 41.66% of efficiency at a rotational speed of 1500 rpm. The result shows that the generator's performance will vary depending on the diameter of the wire at different rotating speeds.
STUDI NUMERIK KINERJA HEAT SINK BERBASIS ALIRAN DUA FASE DENGAN ETIL ASETAT SEBAGAI ALTERNATIF PENDINGIN CONCENTRATED PHOTOVOLTAICS Arirohman, Ilham Dwi; Naimah, Khoirun; Syaukani, Muhammad; Sabar, Sabar
Jurnal Teknologi Terapan Vol 11, No 2 (2025): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v11i2.814

Abstract

Concentrated Photovoltaic (CPV) technology offers the potential to enhance solar energy conversion by utilizing light focusing technology to increase the solar irradiation flux received by photovoltaic cells. On the other hand, as the solar energy density increases on a PV cell, the surface temperature of the PV also rises, which results in decreased energy conversion efficiency and the possibility of thermal fatigue. Therefore, a reliable cooling system is required for CPV. This study aims to evaluate the performance of a two-phase flow heat sink with ethyl acetate (C4H8O2) as the working fluid, which has a low boiling point and high heat of vaporization, making it quite effective for heat transfer. The method used is numerical simulation using Computational Fluid Dynamics (CFD) software. The simulation results show that the heat sink heat transfer effectiveness is 86.03%, with a thermal resistance value of 0.0073 . The highest temperature on the solid part is 105  showing an increasing trend but not significantly, while the average fluid temperature tends to remain constant at 55 . This indicates that the evaporation process is able to maintain the heatsink temperature at stable level.
Pengaruh Plugging Terhadap Kinerja High Pressure Heater Tipe Shell and U-Tube Heat Exchanger (Studi Kasus: Unit 1- 4 di PT ABC) Muhammad, Ghaffar; Arirohman, Ilham Dwi; Naimah, Khoirun
Quantum Teknika : Jurnal Teknik Mesin Terapan Vol. 6 No. 2 (2025): April
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jqt.v6i2.23010

Abstract

High Pressure Heater (HPH) is an auxiliary component used to be required in regenerative steam power plants. The component is a heat exchanger utilized to enhance the power plant’s efficiency by enabling high pressure heating process for feedwater before entering the economizer in boiler using bled steam from turbine. The heat transfer effectiveness of HPH needs to be evaluated in relation to its operational conditions which are equipped with plugs to overcome leaks. This study aims to evaluate the impact of number of plugs on the high-pressure heater 5 in unit 1-4 PT ABC regarding heat transfer and its effectiveness. The Number of Transfer Unit (NTU) method along with Log Mean Temperature Difference (LMTD) method were employed in analysis of this research. The existing number of plugs are 4, 574, 100, and 111 in unit 1, 2, 3, and 4 respectively. The result shows that the heat transfer value for high pressure heaters in unit 1-4 PT ABC are 16.18 MW, 10.32 MW, 15.20 MW and 15.08 MW respectively, while the effectiveness value are 0.89, 0.74, 0.88, and 0.88. The study concludes that the effect of number of plugs in high-pressure heater regarding to heat transfer and effectiveness tends to be inversely linear.
Analysis of Electrical Energy Consumption in Office Buildings of the Institute Technology of Sumatra in Energy Conservation and Efficiency Efforts Naimah, Khoirun; Arirohman, Ilham Dwi; Zen, Muhammad Rizky; Wicaksono, Rihardian Maulana; Soelami, F.X. Nugroho; Rahmatullah, Abri; Purba, Leonardo D.; Gaol, Javeni Eysama L.
Jurnal Edukasi Elektro Vol. 7 No. 2 (2023): Jurnal Edukasi Elektro, Volume 7, Nomor 2, 2023
Publisher : DPTE FT UNY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jee.v7i2.65003

Abstract

Electrical energy is one of the basic human needs in carrying out various activities or daily activities, especially in office buildings such as office buildings of state higher education institutions, namely the Sumatra Institute of Technology (ITERA). Office buildings are the third highest consumer of electrical energy after shopping centers and hotels. The high demand for electrical energy requires the user sector to make efficiency in energy use. Before making efficiency, it is necessary to know the profile of electrical energy consumption including energy consumption intensity (ECI) and significant energy users. Therefore, in this study, an analysis of electrical energy consumption in each ITERA office building was carried out, through observation and interviews according to SNI / ISO 50002: 2018 energy audit procedures. The results obtained show that the total energy use of the 6 largest buildings (A, B, C, D, E, and F) in May 2023 is 144768 kWh and from the calculation of the ECI value is in the very efficient category (7.44 kWh/m2/month). From 6 existing buildings, there are 3 buildings that are very efficient, 1 building is efficient, and 2 buildings are quite efficient. Then, significant energy users were found by 83% in building C AC. Recommendations for saving energy in the effort of energy conservation and efficiency that can be done include, making changes in habits / patterns of use of electrical energy user equipment, especially in air conditioners and dispensers, so as to save electricity 2-21%, and retrofitting refrigerant AC types of split ducts and cassettes that still use R-22 with MC-22 which can save electricity 15-25%.
Twist and chord optimization using the linearization method on the taper blade of a micro-horizontal axis wind turbineTwist and chord optimization using the linearization method on the taper blade of a micro-horizontal axis wind turbine Syaukani, Muhammad; Aryadi, Anugrah Wahyu; Arirohman, Ilham Dwi; Sofyan, Sarwo Edhy; Bahar, Aditiya Harjon; Sabar, Sabar
Jurnal Polimesin Vol 22, No 5 (2024): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i5.5540

Abstract

The research aims to optimize the geometry of taper blade profiles for the Horizontal Axis Wind Turbine (HAWT) to improve aerodynamic performance and minimize fabrication complexity. The study used blade linearization as an optimization method for identifying a desirable twist (β) and chord (Cr). This approach enhances accuracy and boosts computational efficiency. It simplifies the optimization process by reducing complexity. In contrast, traditional nonlinear methods are slower and more resource-intensive due to complex aerodynamic interactions. The best β and Cr distributions were found by linearization with elements 1 and 10 of the blade length and positions 5%, 15%, 25%, 35%, 45%, 55%, 65%, 75%, 85, and 95% of the blade elements. The linearization results were used to determine the optimum performance of the HAWT design using simulation. The optimal blades for HAWT were fabricated and their performance evaluated under real wind conditions. The linearization of the 45% twist and chord of elements 1 and 10 provided the best blade shape. Optimized twist and chord yielded HAWT performance with the Cp of 45% to 47% at rotational speeds of 200–900 rpm and wind speeds of 2–10 m/s. Twist and chord optimization increased the Cp from 39.71% to 46.43% with a rotational speed of 550 rpm at a wind speed of 6 m/s, as well as the maximum mechanical power from 424.28 watts to 500.35 watts at a wind speed of 10 m/s. The result from real wind conditions showed that manufactured HWAT produced an average electrical power of 294.19 watts at a rotational speed of 590.66 rpm. These results demonstrate that the optimized design approach presents a close match and is still reasonable in comparison to practical conditions.
EFFECT OF BLEACHING EARTH ADDITION IN THE PRETREATMENT OF USED COOKING OIL ON BIODIESEL QUALITY Devy Arysandi; Ilham Dwi Arirohman; Muhammad Rizky Zen; Aji Suhartoyo
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i1.826

Abstract

Used cooking oil represents a promising alternative feedstock for biodiesel production due to its environmental benefits and economic feasibility. However, its direct utilization is limited by the high free fatty acid (FFA) content, which can interfere with the transesterification process. Therefore, a pretreatment process is required. This research investigates the effect of adding bleaching earth to the pretreatment process of used cooking oil (UCO) on the quality of the biodiesel produced. The research was conducted using a laboratory-scale experimental method with variations in the bleaching earth percentage from 0.5% to 2.0% (w/w). The findings indicate that bleaching earth significantly improves the quality of UCO as a biodiesel feedstock. Nevertheless, excessive addition of bleaching earth may lead to degradation effects and reduced stability of the biodiesel. Optimal performance, corresponding to compliance with SNI 7182:2015, was achieved with the addition of 1.0% bleaching earth. The resulting biodiesel had an acid number of 0.224 mg KOH/g, a density of 851.12 kg/m³, a viscosity of 4.44 cSt, a yield of 72.84% and a calorific value of 46.92 MJ/kg. Additionally, the physical quality, that is color of the biodiesel produced, is bright yellow.
Co-Authors Achmad Gus Fahmi Afit Miranto Agung Dwi Saputra Aji Suhartoyo Akhmad Zidni Hudaya Alfian, Devia G. C Ammar, Naufal Apriansyah Julio Aryadi, Anugrah Wahyu Bahar, Aditiya Harjon Deendarlianto Devia Gahana Cindi Alfian Devy Arysandi Devy Arysandi Fahmi Sapta Hadi Fajar Paundra Fajar Paundra Fitrah Qalbina Gaol, Javeni Eysama L. Harahap, Al Barra Harmiansyah Hotdimas Simanjuntak I Indarto Ismail, Abdi Khoirun Naimah Kiki Yuli Handayani Lathifa Putri Afisna Madi Madi Muhammad Khanafi Muhammad Ridho Hilman Muhammad Syaukani Muhammad, Ghaffar Muhyi, Abdul Naimah, Khoirun Pujiyulianto, Eko Purba, Leonardo D. Putty Yunesti Putty Yunesti Rahmat Ramadhan Wahab Rahmatullah, Abri Rihardian Maulana Wicaksono Rihardian Maulana Wicaksono Sabar Sabar Sadono, Fajar Sidik Shintha Sarmila A.S Yahya Siti Muslimah Soelami, F.X. Nugroho Sofyan, Sarwo Edhy Syah, Muhammad Aksel Tuswan Tuswan Wicaksono, Rihardian Maulana Yulianti Fatmawati Yunesti, Putty Zen, Muhammad Rizky