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Rotama Arifin Sidabutar
Jurusan Teknik Mesin, Universitas Darma Agung
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Pengaruh Variasi Konsentrasi Metanol dan Biogasoline Hasil Pirolisis Terhadap Performa Mesin Otto dengan Menggunakan Dynotest Siahaan, Enzo W.B; Sidabutar, Rotama Arifin; Sitanggang, Hodmiantua
BEES: Bulletin of Electrical and Electronics Engineering Vol 5 No 2 (2024): November 2024
Publisher : Forum Kerjasama Pendidikan Tinggi (FKPT)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47065/bees.v5i2.6334

Abstract

Global environmental issues are becoming more pressing with the increasing volume of plastic waste and the decline in fossil fuel resources. According to a report from the United Nations Environment Programme (UNEP), more than 300 million tons of plastic are produced annually, and around 50% of it is single-use plastic. This study aims to evaluate the effect of adding methanol to biogasoline from pyrolysis of plastic waste on an Otto engine, in this case a carburetor motorcycle. Plastic waste processed through pyrolysis produces biogasoline, which is then mixed with methanol in concentrations of 20% (BM20) and 30% (BM30). This test was carried out using a dynotest machine to measure power, torque, and air fuel ratio (AFR) in the engine speed range of 1000 to 7500 rpm. The results showed that the addition of methanol had an effect on increasing engine performance, especially on the power and torque produced. At 20% methanol concentration, engine power increased up to 5500 rpm before decreasing at 7500 rpm, while at 30% concentration, power increased from 200 rpm and began to decrease at 6700 rpm. Meanwhile, AFR showed a stable tendency at the beginning of engine speed with a significant decrease at high speed, especially in BM30. For AFR, BM30 produced more stable combustion at low speed but experienced a drastic decrease at high speed, with the air-fuel ratio reaching an imbalance above 7000 rpm. This study contributes to the development of alternative fuels based on plastic waste that are more efficient and environmentally friendly. The addition of methanol has been shown to improve the combustion quality of biogasoline, although further optimization is needed to achieve consistent performance across all engine speed ranges.
Pengaruh Variasi Konsentrasi Metanol Terhadap Karakteristik Bahan Bakar Biogasoline Berbahan Baku Limbah Plastik Hasil Pirolisis Sidabutar, Rotama Arifin; Siahaan, Enzo W.B; Sitanggang, Hodmiantua
Jurnal Teknik Mesin Vol 17 No 2 (2024): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.17.2.1522

Abstract

The increasing volume of plastic waste and the depletion of fossil fuel reserves have encouraged the search for renewable energy alternatives. This study examines the use of the pyrolysis process on plastic waste to produce biogasoline and optimises the characteristics of the fuel by adding methanol concentration. The pyrolysis process, conducted at 3500C, produces plastic oil, which is then mixed with methanol in various concentrations (5%, 10%, 20%, and 30%). The effect of methanol addition on the physical characteristics of biogasoline, including the Research Octane Number (RON) value, density, viscosity, heating value, and flash point, was analysed. The results showed that the addition of methanol concentration gave the highest RON value of 83.3, while the 10% methanol concentration produced the highest calorific value of 53,865 j/g. The addition of methanol concentration also had a positive effect on increasing the flash point of the fuel. This study also shows the potential of biogasoline made from plastic waste as an efficient and environmentally friendly alternative fuel.
PENGARUH VARIASI KONSENTRASI COOLANT DENGAN AIR MINERAL TERHADAP PENURUNAN SUHU CAIRAN PADA RADIATOR MOTOR BENSIN 1500 CC Sitanggang, Hodmiantua; Siahaan, Enzo Wiranta Battra; Sidabutar, Rotama Arifin
JUITECH: Jurnal Ilmiah Fakultas Teknik Universitas Quality Vol 8, No 2 (2024): Vol 8 No 2 2024
Publisher : Universitas Quality

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36764/ju.v8i2.1512

Abstract

Radiator merupakan alat penukar panas pada mesin kendaraan yang berfungsi untuk menyalurkan panas yang dihasilkan oleh sistem yang bekerja pada mesin kendaraan. Panas mesin yang dihasilkan dari pembakaran bahan bakar pada silinder digunakan untuk menghasilkan tenaga namun jika dibiarkan panas yang berlebihan dapat menyebabkan kerusakan pada komponen mesin. Sistem pada mesin dapat distabilkan dengan adanya sistem pendingin yang dibantu cairan dan udara yang melalui radiator. Sehingga suhu kerja mesin kendaraan dapat dipertahankan. Ada berbagai macam variasi carian pendingin yang disediakan produsen otomotif di pasaran dan dalam pengaplikasiannya seringkali penggunaan cairan pendingin (coolant) dicampur dengan air mineral, air demineralisasi, dll. Sehingga mempengaruhi kinerja dari penggunaan cairan pendingin tersebut.Penelitian menaganalisa perbedaan efektivitas yang dihasilkan dari hasil pencampuran cairan pendingin dari produsen coolant TOP 1 dan Prestone yang dipadukan dengan pencampuran udara pada masing-masing coolant dengan variasi 100% coolant, 75% coolant dan 50% cairan pendingin terhadap pencampuran udara, dengan variasi putaran pada 1500 rpm, 2000 rpm, dan 2500 rpm dan waktu pengukuran 10, 30, dan 60 detik pada mesin Toyota Rush.Dari hasil penelitian yang dilakukan, rata-rata efektifitas radiator tertinggi terjadi pada cairan pendingin TOP 1 dengan efektifitas rata-rata sebesar 0.725 dengan konsentrasi cairan coolant 100% dan pada posisi kedua yaitu cairan pendingin Prestone dengan efektifitas rata – rata sebesar 0,555 dengan konsentarsi cairan coolant 70%, sementara untuk posisi terendah yaitu TOP 1 dengan konsentrasi cairan pendingin sebesar 50% dengan efektifitas rata – rata sebesar 0,129.
Evaluasi Kinerja Electrostatic Precipitator (ESP) Dalam Mengurangi Emisi Gas Buang Pada Pembakaran Solid Fuel Di Power Boiler 200 TPH Battra Siahaan, S.T, M.T, Enzo Wiranta; Sitanggang, Hodmiantua SItanggang; Sidabutar, Rotama Arifin
JUITECH: Jurnal Ilmiah Fakultas Teknik Universitas Quality Vol 9, No 1 (2025): Vol 9 No 1 2025
Publisher : Universitas Quality

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36764/ju.v9i1.1653

Abstract

Polusi udara adalah salah satu jenis polusi yang dikategorikan sebagai polusi yang sangat berbahaya dan memiliki dampak yang cukup besar. Hal ini disebabkan oleh partikel polutan dari polusi ini yang sangat kecil sehingga masyarakat tidak menyadarinya. Berdasarkan bentuk fisiknya, polutan di udara tidak hanya berupa gas atau uap, tetapi juga dapat berupa benda padat dalam bentuk partikel, yaitu berupa debu, asap, dan bau. Berdasarkan hal ini, diperlukan penggunaan alat untuk mengontrol emisi gas, yaitu Electrostatic Precipitator (ESP). Penelitian ini dilakukan dalam beberapa tahap, yaitu pengamatan lapangan, studi literatur, pengumpulan dan pengolahan data, bimbingan studi, dan tahap terakhir adalah pembuatan laporan. Kesimpulan dari penelitian ini adalah untuk mengetahui efisiensi pengaturan tegangan DC pada unit transformer ESP dan efisiensi mesin ESP, dimana untuk pengaturan tegangan DC 70kV pada unit elektrostatik precipitator memiliki efisiensi sebesar 98,88% dan efisiensi ESP berdasarkan desain adalah 99,99%. Setelah mendapatkan hasil pengaturan transformer tegangan DC, area efektif memiliki luas 32.256 m², kecepatan migrasi partikel adalah 5,3 m/s, dan kekuatan medan listrik adalah 165 kV.
Development of an Arduino-Based Microcontroller System to Maintain Temperature Stability in the Plastic Waste Pyrolysis Process Siahaan, Enzo Wiranta Battra; Sitanggang, Hodmiantua; Sidabutar, Rotama Arifin
TEKNIK Vol 46, No 3 (2025): Juli 2025
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v46i3.71892

Abstract

This study aims to develop and evaluate a temperature monitoring and control system for a plastic pyrolysis model operating within the temperature range of 400–500 °C. The system is designed using a microcontroller to read signals from 4 thermocouples placed at various points within the pyrolysis chamber. The collected temperature data are processed, displayed on an LCD screen, and stored on an SD card. Temperature control is carried out using a potentiometer, while data logging is managed through push-button switches. An electric heater is used as the heat source, controlled by a relay, and temperature readings are calibrated using a commercial thermometer to ensure accuracy. The test results indicate that the system is capable of consistently monitoring and maintaining temperatures within the specified range. Although temperature variations were observed at different measurement points, the system generally demonstrated good performance in temperature control. The system effectively approached the target temperature, though temperature deviations were still influenced by heating rate and thermocouple characteristics. Additionally, the observed uneven temperature distribution highlights the need for improvements in the heating system design to enhance thermal uniformity within the pyrolysis chamber.
Pemberdayaan Ekonomi Produktif Warga Binaan Lapas Kelas II A Labuhan Ruku Melalui Program Pelatihan Teknik Dasar Pengelasan Battra Siahaan, Enzo Wiranta; Sitanggang, Hodmiantua; Sidabutar, Rotama Arifin
JPM: Jurnal Pengabdian Masyarakat Vol. 6 No. 2 (2025): October 2025
Publisher : Forum Kerjasama Pendidikan Tinggi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47065/jpm.v6i2.2670

Abstract

This community service program aims to improve the technical skills and job readiness of inmates at Class IIA Labuhan Ruku Prison through basic welding training. The training method applied a combination of hands-on practice, lectures, and intensive mentoring, involving 20 participants, most of whom had no prior welding experience. The results indicated a significant improvement in participants’ technical skills, motivation, and self-confidence, with 90% of them successfully performing basic welding independently. Participants’ satisfaction with the program was also high, with an average score of 4.5 out of 5. The limitation of this program lies in its short duration and the absence of official certification as a formal recognition of participants’ skills. The absence of formal certification limits participants’ access to directly enter the industrial labor market, thus the outcomes of the training are more optimally directed toward strengthening economic independence through small welding workshops or ent
Performance Analysis of Horizontal Shaft Wind Turbine Through Blade Design Modification Siahaan, Enzo W B; Sidabutar, Rotama Arifin; Sitanggang, Hodmiantua
Jurnal Teknik Industri Terintegrasi (JUTIN) Vol. 7 No. 1 (2024): January
Publisher : LPPM Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/jutin.v7i1.24912

Abstract

The objective of this study is to investigate the performance of a horizontal shaft wind turbine model with variations in blade shapes. The focus of the research lies in examining the impact of different blade shapes, specifically the curved shape, inverted linear taper, and rectangular shape measuring 8 cm x 20 cm at a 200 tilt angle. The experiments are conducted at various wind speeds: 7, 8, 9, 10, and 11 m/s. The findings reveal that changes in blade shape significantly influence the operation of the horizontal shaft wind turbine. The Brake Horse Power (BHP) reaches its maximum with a rectangular blade shape, achieving 1.1 watts at a wind speed of 11 m/s and a corresponding torque of 0.0221 Nm. Additionally, the highest efficiency is attained with the rectangular blade shape at a wind speed of 7 m/s, reaching 21%.
Co-Authors Hodmiantua Sitanggang Siahaan, Enzo W.B Sitanggang, Hodmiantua SItanggang