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All Journal Transmisi International Journal of Engineering, Science and Information Technology Jurnal Hurriah: Jurnal Evaluasi Pendidikan dan Penelitian Malikussaleh Journal of Mechanical Science Technology Jurnal Teknologi Kimia Unimal Sisfo: Jurnal Ilmiah Sistem Informasi International Journal Engineering and Applied Technology (IJEAT) Jurnal Polimesin Jurnal Solusi Masyarakat Dikara
Asnawi
Program Studi Teknik Mesin, Universitas Malikussaleh
Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation Other

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Optimasi Spark Timing Motor Bakar SI dengan Menggunakan Elpiji Sebagai Bahan Bakar A Asnawi; Adi Setiawan; Jufrizal Ismail
Malikussaleh Journal of Mechanical Science and Technology Vol 4, No 2 (2016): Malikussaleh Journal of Mechanical Science and Technology
Publisher : Malikussaleh University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/mjmst.v4i2.10892

Abstract

Pengalihan sumber energi menjadi topik utama di dunia transportasi agar dapat menggunakan bahan bakar alternatif yang lebih ramah lingkungan sebagai sumber energi pada motor bakar. Salah satu jenis bahan bakar yang digunakan sebagai sumber energi pada motor bakar adalah bahan bakar elpiji. Penggunaan elpiji pada motor bakar dapat berpengaruh terhadap unjuk kerja motor bakar, hal ini disebutkan pada pembahasan karakteristik bahan bakar yang digunakan. Penelitian ini dilakukan untuk mengoptimalkan penggunaan elpiji sebagai sumber energi pada motor bakar, sehingga proses konversi energi yang terjadi dapat dihasilkan secara optimal, optimasi dilakukan dengan cara memvariasikan sudut percikan api  dan pengujian unjuk kerja dioperasikan pada berbagai kecepatan putaran mesin. Pengujian juga dilakukan dengan menggunakan bahan bakar bensin pada sudut pengapian standar 10° sebelum TMA, yaitu untuk menjadi data acuan dalam penelitian ini. Hasil  pengujian menggunakan elpiji menunjukkan terjadinya penurunan daya rata-rata sebesar 11,25% pada sudut percikan api 16° sebelum titik mati atas. Penurunan daya dan torsi yang dihasilkan pada motor bakar disebabkan oleh rendahnya energi input, yaitu jumlah O2 dan bahan bakar yang masuk kedalam ruang bakar terjadi penurunan. Dampak positif penggunaan elpiji pada motor bakar adalah dapat meningkatkan efisiensi serta menurunkan konsumsi bahan bakar spesifik, hal ini menunjukkan penggunaan elpiji lebih menguntungkan dibandingkan dengan bahan bakar bensin
Kalkulasi Potensi Panas Bumi Seulawah Agam Secara Kualitatif dan Kuantitatif Sebagai Energi Alternatif Untuk Pembangkit Listrik A Asrillah; A Asnawi
Malikussaleh Journal of Mechanical Science and Technology Vol 2, No 1 (2014): Malikussaleh Journal of Mechanical Science and Technology
Publisher : Malikussaleh University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/mjmst.v2i1.10920

Abstract

Penelitian ini dilakukan untuk memetakan potensi Panas Bumi Seulawah Agam sebagai energi alternatif untuk pembangkit listrik. Maka pertama, dilakukan pemetaan potensi Panasnya (hydrothermal) dengan menggunakan metode Gaya Berat (Gravity Method) yang mencari perbedaan nilai kerapatan batuan bawah permukaan dengan batuan di sekitarnya. Jika secara kualitatif ditemukan sumber panas dengan sebaran luasnya tertentu, maka selanjutnya dilakukan perhitungan potensi panas secara kuantitatif dengan menggunakan persamaan Temperatur Geotermometrik Silika (SiO2). Pengambilan data dilakukan dengan menggunakan Gravitimeter Autograv, Cintrex- CG-5 berserta alat-alat lain sebagai pendukung dan dilakukan di dua daerah yaitu di kawasan Kawah Heutsz sepanjang 5,8 km dan di  kawasan Kawah Cempaga dengan panjang lintasan adalah 4 km, kemudian data direkam dengan mengikuti lintasan grid. Selanjutnya, data tersebut diproses secara sederhana menggunakan Microsoft Excel. Hasil survei metode Gaya Berat ini memberikan informasi bahwa   pada lintasan sekitar Kawah Heutsz terdapat patahan dan rekahan, sehingga kerapatan batuan relatif tinggi yang disebabkan adanya pembentukan mineral oleh fluida panas dalam rekahan batuan tersebut Sementara data di kawasan Kawah Cempaga menyatakan bahwa nilai kerapatannya rendah yang mengindikasikan adanya struktur geologi yang berupa patahan yaitu patahan Seulimum yang berfungsi sebagai media untuk sirkulasi sistem Panas Bumi, sehingga atas dasar kedua hasil tersebut dapat dikerucutkan bahwa Seulawah Agam prospek untuk dieksplorasi.  Kemudian dari perhitungan kuantitatif didapatkan nilai jumlah Panas Bumi berkisar 58,8 MWe. Potensi sebesar ini, sangat cocok untuk menjadi sumber energi alternatif untuk pembangkit listrik yang dapat mengurangi difisit energi listrik yang selama ini terjadi di Aceh.
Evaluation of Fluid Flow Velocity Variations on the Plate Heat Exchanger Performance Andika Syahputra; Asnawi Asnawi; Ahmad Nayan; Alchalil Alchalil; Nurul Islami
TRANSMISI Vol 19, No 1 (2023): March 2023
Publisher : University of Merdeka Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26905/jtmt.v19i1.9650

Abstract

Heat exchanger expected to high effectiveness of heat transfer. Type of plate heat exchanger was more efficient compare to another heat exchangers in industrial applications with pressure less than 30 bar. The increased velocity of cold fluid flow has an impact to increase the performance of heat exchanger by  heat transfer rate (Q), heat transfer coefficient (U), and the effectiveness of heat exchanger (ε). The increased velocity of cold fluid flow also incresing the heat transfer rate. The study carried out by variation of the cold fluid velocity at 0.03 m/s, 0.037 m/s, 0.045 m/s, 0.051 m/s and 0.059 m/s. Inlet hot fluid temperature (Th,i) at 45°C and cold fluid temperature (Tc,i) at 27°C constant. The results shows Q value from the original 1570.71 Watt to 1916.16 Watt on the hot side and 1751.89 Watt to 2187.01 Watt on the cold side. The U value from the original 1180.46 W/m2.°C becomes 1408,75 W/m2. °C. The ε value increased from 60.33% to 75.69%. The increasing of  cold fluid velocity directly proportional to the the heat transfer rate (Q) and performance of the plate heat exchanger. This Phenomenon due to the faster circulation of the cold fluid, which causes the cold fluid to quickly return to its initial temperature (Th,i), an than increasing the plate heat exchanger's performance.
Effects of bioethanol addition to the biodiesel-diesel fuel blend on diesel engine exhaust emissions Asnawi Asnawi; Muhammad Muhammad; Abdul Rahman; Nurul Islami; Diki Dian Andika; Ihsanul Fikri Hutabarat; Irwansyah Situmorang
Jurnal POLIMESIN Vol 21, No 3 (2023): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i3.3460

Abstract

The transition of energy sources from fossil fuel to biofuel is becoming a major topic in the world towards renewable energy to reduce greenhouse gas emissions, improve environmental air quality, and reduce dependence on fossil fuel in the future. This study aims to evaluate the effect of increasing the concentration of oxygenated biofuel in diesel fuel on the emissions of diesel engines. In this study, B30 (30% biodiesel and 70% diesel) was used as a base fuel, and a fraction of pure biodiesel (B100) was added to increase the biodiesel concentration in B30 fuel to create B40 (40% biodiesel and 60% diesel). Furthermore, the addition of 5% and 10% of bioethanol as a fuel additive in the fuel blend was conducted while maintaining a biodiesel concentration of 40%. The effect of bioethanol contained in the fuel blends was tested using a single-cylinder 418 cc diesel engine.  The experiment was carried out at an engine speed of 1000–3000 rpm. The result shows that the concentration of the diesel-biodiesel-bioethanol blend affected the emissions produced by the diesel engines. Combustion efficiency increased with the concentration of biodiesel in the diesel fuel, as shown by reduced CO emissions, increased CO2 emissions, and increased NOx emissions at engine speeds of 2000–3000 rpm. In comparison to 5% bioethanol at various engine speeds, adding 10% bioethanol has a disadvantageous effect on the combustion process, increasing CO and HC emissions.
Kaji Eksperimental Pengaruh Campuran Bahan Bakar Bioetanol-Bensin Terhadap Unjuk Kerja Mesin SI Asnawi Asnawi; Adi Setiawan; Muhammad Sayuthi; Tri Waluyo; Hagi Radian
Jurnal POLIMESIN Vol 20, No 2 (2022): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i2.2645

Abstract

Bioethanol is a clean fuel, renewable energy source that can be used in place of fossil fuels. Bioethanol has similar characteristics to gasoline fuel, making it an excellent alternative fuel for SI engines, contributing to the reduction of air pollution, the increased use of biofuels, and the removal of fossil fuel consumption. Analysis of the SI engine performance using gasoline fuel with an octane rating of 90 and gasoline-bioethanol blends containing up to 20% bioethanol concentration, each fuel blended at 5% by volume fraction. The purpose of this study is to present the experimental results for a spark ignition (SI) engine with a single injector that operates by using a gasoline-bioethanol blend as fuel. Analysis of the SI engine performance by using gasoline fuel with an octane rating of 90 and gasoline-bioethanol blends containing up to 20% bioethanol concentration. Each fuel was blended with bioethanol at an interval of 5% by volume fraction. The test was conducted on an SI engine with a capacity of 1500 cc, four cylinders, and a single injector was used to distribute fuel to each cylinder through the intake manifold. The shaft of the engine is connected to a 75 kW of eddy current dynamometer shaft to measure the engine torque. The engine load is controlled using an interface computer system. Load on an engine is done by increasing braking on the dynamometer, and real-time signals from the sensors are recorded. Each fuel sample is operated at full load or wide-open throttle (WOT) at speeds ranging from 1000 to 5500 revolutions per minute (rpm). The experiments show that adding bioethanol to gasoline fuel can have a significant effect on the single injector SI engine performance. When the bioethanol concentration of 10% (E10) by volume is used, it is possible to maintain engine power with lower fuel consumption or lower the energy supply to the engine cylinder, thereby increasing the thermal efficiency of the single-injector SI engine by 6.33% compared to gasoline fuel.
Analisa Aerodinamika Body Mobil Listrik Dengan Metode Compputational Fluid Dynamic (CFD) pada Variasi Frontal Area dan Kecepatan Aliran Udara Menggunakan Software Ansys Fluent Adi Pangestu, Rangga; Asnawi, A; Nayan, Ahmad; Setiawan, Adi; Muhammad, M
Malikussaleh Journal of Mechanical Science and Technology Vol. 8 No. 1 (2024): Malikussaleh Journal of Mechanical Science and Technology
Publisher : E-Journal Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/mjmst.v8i1.14931

Abstract

Currently the government is working to achieve a Golden Indonesia 2045 and Indonesia Net Zero Emissions (NZE) 2060. In an effort to reduce carbon emissions, one of the government's efforts is to use electric vehicles in the transportation sector and create an Energy Saving Car (KMHE) competition organized by Ministry of Education, Culture, Research and Technology (Kemendikbudristek). This research was conducted to determine the aerodynamic values and their influence on variations in the frontal area and leading edge of the Pase Team Electric car body at Malikussaleh University. This simulation analysis was carried out using the computational fluid dynamic (CFD) method using Ansys Fluent software as a simulation tool. With variations in air flow speed of 2.7 m/s, 5.5 m/s, 8.3 m/s and 11.1 m/s, the aerodynamic values and influences on each body variation are obtained. For the drag coefficient on a body with a frontal area A=0.48m2, the average value obtained from the three leading edge angles 36áµ’, 15áµ’ and 0áµ’ is 0.151. Then for the lift coefficient, an average value of -0.255 is obtained, which means the body produces a relatively low CD but produces large downforce. For the drag coefficient on a body with a frontal area A=0.39m2, the average value obtained from the three leading edge angles 36áµ’, 15áµ’ and 0áµ’ is 0.134. Then for the lift coefficient, the average value was -0.138. So it can be concluded that by reducing the frontal area on the body and the leading edge angle, the Cd value can be reduced by 11.34% and CL by -46%.
EVALUASI UNJUK KERJA ALAT PENUKAR KALOR JENIS CONCENTRIC DENGAN VARIASI KECEPATAN ALIRAN FLUIDA KERJA Nugraha, Andra; Asnawi, A
Malikussaleh Journal of Mechanical Science and Technology Vol. 7 No. 2 (2023): Malikussaleh Journal of Mechanical Science and Technology
Publisher : E-Journal Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/mjmst.v7i2.15459

Abstract

Heat transfer is a science of heat transfer energy that is indispensable for analyzing the heat transfer process. One type of heat exchanger that is widely used is the Concentric heat exchanger. From the explanation of the theory that the influence of increasing the flow velocity of the cold fluid will affect the increase in the value of the performance of the heat exchanger.  Therefore, this influence will provide an increase in heat transfer performance, especially at the heat transfer rate, (Q), heat transfer coefficient (U), and also heat transfer effectiveness (ε). By increasing the variation in the flow velocity of cold fluid by setting the temperature of the hot fluid (Thi) at 45°C and the temperature of the cold fluid (Tci) at 27°C and also made constant up to the highest velocity variation in the cold fluid. From the most minimum performance value at a cold fluid flow rate of 0.067 m/s to 0.134 m/s  in the concentric heat exchanger type, performance values were obtained including the heat transfer rate (Q) from 714.09 Watts to 1111.51 Watts on the heat side and 619.89 Watts to 901.83 Watts on the cold side, for the heat transfer coefficient (U) a value of 337.90 W / m2 was obtained. C to 405.38 W/m2. C , and for the effectiveness (ε) which was originally 29% to 43%.
ANALISA INDIKATOR KINERJA TEROWONGAN ANGIN RANGKAIAN TERBUKA (OPEN CIRCUIT WIND TUNNEL) TIPE SUBSONIC Aditya, Vikra; Alchalil, Alchalil; Asnawi, Asnawi; Rahman, Abdul
Malikussaleh Journal of Mechanical Science and Technology Vol. 7 No. 2 (2023): Malikussaleh Journal of Mechanical Science and Technology
Publisher : E-Journal Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/mjmst.v7i2.13658

Abstract

Fluid is a substance that can change its shape continuously due to the acting tangential shear force. Aerodynamics is a branch of fluid dynamics that studies specifically the forces acting on an object contained in a fluid flow. Wind Tunnel is a tool used in aerodynamics research to study airflow characteristics. Wind tunnel performance indicators include flow uniformity, flow and pressure distribution, aerodynamic forces acting on test objects in the wind tunnel. By using unsymmetrical airfoils, the impact of speed variations of 2 m/s, 4 m/s, 6 m/s, 8 m/s, 10 m/s and increasing angles of attack ranging from 0°, 5°, 10° on fluid flow can be determined. Tests were conducted in a section of the wind tunnel measuring 30 cm x 30 cm x 40 cm. Overall, the open-type wind tunnel has not been able to create uniform flow. The Reynolds number is at Re>4,000, so the wind tunnel under study is turbulent. The results of the speed variation and angle of attack increase also have an impact on the lift and drag coefficient values of the airfoil. At the maximum speed variation of 10 m/s with an angle of attack of 10°, the lift coefficient is 0.14350 and the drag coefficient is 0.15162.
The Effect of Hydrogen Enrichment on The Exhaust Emission Characteristic in A Spark Ignition Engine Fueled by Gasoline-Bioethanol Blends Rahman, Abdul; Asnawi, Asnawi; Putra, Reza; Radian, Hagi; Waluyo, Tri
International Journal of Engineering, Science and Information Technology Vol 2, No 2 (2022)
Publisher : Malikussaleh University, Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (506.493 KB) | DOI: 10.52088/ijesty.v2i2.234

Abstract

Bioethanol characteristics can be used as an alternative fuel to spark-ignition (SI) engines to reduce emissions. This experiment evaluates the production of emissions for SI engines using hydrogen enrichment in the gasoline-bioethanol fuel blends. The fraction of bioethanol fuel blend was added to the gasoline fuel of 10% by volume and hydrogen fuel produced by the electrolysis process with a dry cell electrolyzer. The NaOH was used as an electrolyte which is dissolved in water of 5% by a mass fraction. The test is conducted using a single-cylinder 155cc gasoline engine with sensors and an interface connected to a computer to control loading and record all sensor variables in real-time. Hydrogen produced from the electrolysis reactor is injected through the intake manifold using two injectors, hydrogen injected simultaneously at a specific time with a gasoline-bioethanol fuel. The test was conducted with variations of engine speeds. The emission product of ethanol--H2 (BE10+H2) was an excellent candidate as a new alternative of fuel solution in the future. The engasolinerichment of hydrogen increased the flame speed and generated a stable combustion reaction. The hydrogen enrichment produced CO2 emission due to the unavailability of carbon content in hydrogen fuel. As a result, the C/H ratio is lower than for mixed fuels.
Evaluasi Unjuk Kerja Generator HHO Type Dry Cell dengan Variasi Penambahan Karbon Aktif pada Katalis Natrium Hidroksida (NaOH) Simanjuntak, Ochitria Cintia Br; Asnawi, Asnawi; Putra, Reza; Setiawan, Adi; Alchalil, Alchalil
Malikussaleh Journal of Mechanical Science and Technology Vol. 8 No. 2 (2024): Malikussaleh Journal of Mechanical Science and Technology
Publisher : E-Journal Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/mjmst.v8i2.17844

Abstract

Gas HHO dapat menjadi energi alternatif dalam transisi energi menuju sistem energi yang lebih efisien, rendah karbon dan berkelanjutan. Gas HHO dihasilkan melalui elektrolisis air menggunakan listrik untuk mengurai air menjadi ion hidrogen. Elektrolisis air membutuhkan energi listrik yang besar sehingga digunakan karbon aktif untuk menghematnya. Penelitian ini bertujuan untuk mengetahui unjuk kerja generator HHO type dry cell dengan penambahan karbon aktif untuk meningkatkan efisiensi dan laju produksi gas HHO. Dalam penelitian ini, data yang dihasilkan berupa daya yang dibutuhkan, laju produksi gas HHO dan efisiensi generator HHO. Metode eksperimen dilakukan dengan memvariasikan karbon aktif 0-10% pada katalis NaOH dengan interval 2.5% tiap variasinya. Hasil penelitian menunjukkan bahwa variasi NaOH dengan penambahan karbon aktif 7.5% mendapatkan laju produksi gas HHO tertinggi dan efisiensi tertinggi sebesar 458.72 ml/min dan 63.04%. Sedangkan variasi yang membutuhkan daya lebih sedikit pada variasi NaOH dengan penambahan karbon aktif 2.5% sebesar 103.01 Watt.  Kata kunci: Transisi energi, elektrolisis air, gas HHO, katalis, karbon aktif
Co-Authors A Asrillah Abdul Rahman Abdul Rahman Adi Pangestu, Rangga Adi Setiawan Aditya, Vikra Ahmad Nayan Alchalil Alchalil Ali Nur Muhammad Zaidin Balatif Andika Syahputra Azi Maulana Ikbal Deassy Siska Dedi Afandi Diki Dian Andika EDI YUSUF, EDI Edy Yusuf Fadhil Risky Ramadhana Hagi Radian Ihsanul Fikri Hutabarat Irwansyah Irwansyah Situmorang Jufrizal Ismail M Sayuti M. H. Rais Muhammad Muhammad Muhammad Muhammad Sayuthi Muhammad, M Muhammad, Muhammad Nugraha, Andra Nur Azura Lubis Nurul Islami, Nurul P. A. Pane Pertiwi, Indah Ayu Putra, Reza Raden Mohamad Herdian Bhakti Radian, Hagi Reza Putra Ridara, Rina Rizki Aulia Nanda Safrizal Safrizal Safrizal, S Simanjuntak, Ochitria Cintia Br Syamsiar, Syamsiar Teuku Hafli Teuku Mudi Hafli Tri Waluyo Tri Waluyo Wardany, Ari Putra Yasir Amani Zulfikar Zulmiardi, Zulmiardi