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All Journal Jurnal Penelitian Saintek TEKNIK Journal of Mechanical Design and Testing (JMDT)
Akmal Irfan Majid
Department Of Mechanical And Industrial Engineering, Faculty Of Engineering, Universitas Gadjah Mada
Decision Sciences, Operations Research & Management Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Analisis Pengaruh Biodiesel B20 Dan B100 Terhadap Degradasi Viskositas Dan Total Base Number Minyak Pelumas Pada Mesin Diesel Yang Beroperasi Dalam Jangka Panjang Dengan Metode ASTM D2896 Dan ASTM D445-06 Sentanuhady, Jayan; Majid, Akmal Irfan; Prashida, W.; Saputro, W.; Gunawan, N. P.; Raditya, T. Y.; Muflikhun, Muhammad Akhsin
TEKNIK Vol 41, No. 3 (2020): December 2020
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v41i3.32515

Abstract

Based on its characteristics, biodiesel has a higher density, viscosity, and acidity level than diesel fuel, so it has a disadvantages in terms of lubricants especially in the long run. The impact, it can decrease the kinematic viscosity of the lubricant, a decrease in the total base number, and the impact by decreased of the engine performance. This research aims to determine the characteristics of lubricants from the use of biodiesel (B20 and B100) related to the kinematic viscosity of lubricants and Total Base Number (TBN). The testing method were used ASTM D2896-15 and ASTM D445-06 standard. The study used two units Kubota RD 65 DI-NB diesel engines with a cylinder volume of 376 cc. The rotary speed of the machine was keep constant at 2200 rpm and were operated for 300 hours non-stop. Moreover, the sampled was carried out every multiple of 100 hours. Based on the research results, the quality of lubricants with B100 fuel is no better than lubricants with B20 fuel. B100-fueled lubricants have kinematic viscosity values at temperatures of 40 °C and 100 °C and has lower TBN values than B20-fueled lubricants.
ELECTRICITY PRODUCTION FROM FOOD WASTE LEACHATE USING DOUBLE CHAMBER MICROBIAL FUEL CELL Willie Prasidha; Akmal Irfan Majid
Jurnal Penelitian Saintek Vol 25, No 1 (2020)
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (546.444 KB) | DOI: 10.21831/jps.v25i1.30210

Abstract

This study was aimed at evaluating the performance of non-aerated and aerated double chamber microbial fuel cells from food waste leachate. The value of open circuit voltage (OCV) and close circuit voltage (CCV) were taken to analyze power density and current density of both configurations. Two double chamber microbial fuel cells (MFC) with different configurations were developed to produce electricity from food waste leachate and studied for 30 days. Anode and catode were made by uncoated carbon felt and graphite rod. Food waste and water were incubated inside a reactor. After 30 days, the electricity production characteristics between the two configurations were obtained. Both configurations reached the same maximum power density and maximum current density but the aerated MFC showed higher performance of maximum open-circuit voltage (OCV), average power density, and current density than non-aerated MFC. The results show that the supplying continuous dissolved air in the cathode chamber resulted in higher voltage, higher average power density, and higher average current density in double chamber microbial fuel cell.
EXPERIMENTAL STUDY ON THE PHENOMENA ON THE SUCCESSIVE DROPLETS IMPACTING HOT COPPER SURFAC Arif Widyatama; Akmal Irfan Majid; Teguh Wibowo; Deendarlianto Deendarlianto; Samsul Kamal
Jurnal Penelitian Saintek Vol 24, No 2: Oktober 2019
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (24.683 KB) | DOI: 10.21831/jps.v24i2.26923

Abstract

This study was aimed at investigating the phenomena and interactions between water droplets and hot metal surfaces using an experimental method. In this study, the droplet was dropped from 50 mm from the top of the metal surface with a frequency of 8.5 droplets per second. The observed droplet diameter was 3.12 mm. The metal used was copper with a surface temperature between 110-240 ° C. High speed video camera with a speed of 2000 fps was used to record visual data. Then the image processing technique was applied to calculate the change in droplet diameter. The results show that at low temperatures, droplets tend to maintain their initial position of contact with fluctuating deformations. While at high temperatures, a bounce phenomenon occurs which results in collisions between droplets being imperfect. Visualization results can reveal the complete change in the droplet geometry in the form of spreading ratio and complete apex height. The temperature of 140° C is the initial transition area for phenomena that result in droplets has no contact with hot surfaces so that the process of heat transfer between surfaces is inhibited.STUDI EKSPERIMEN PADA FENOMENA SUCCESSIVE DROPLETS MENUMBUK PERMUKAAN TEMBAGA PANASPenelitian ini bertujuan untuk mempelajari fenomena dan interaksi antara tetesan air (droplet) dan permukaan logam panas dengan metode eksperimental. Pada penelitian ini, droplet dijatuhkan dari posisi 50 mm dari atas permukaan logam dengan frekuensi 8,5 droplet per detik. Diameter droplet yang diamati sebesar 3,12 mm. Logam yang digunakan adalah tembaga dengan temperatur permukaan di antara 110-240° C. High speed video camera dengan kecepatan 2000 fps digunakan untuk merekam data visual. Teknik image processing diaplikasikan untuk menghitung perubahan diameter droplet. Hasil penelitian menunjukkan bahwa pertama, pada temperatur rendah, droplet cenderung mempertahankan posisi awal kontak dengan perubahan bentuk yang fluktuatif. Kedua, temperatur tinggi, terjadi fenomena bouncing yang mengakibatkan tumbukan antar droplet menjadi tidak sempurna. Hasil visualisasi dapat mengungkap perubahan geometri droplet berupa spreading ratio dan apex height secara lengkap. Dari penelitian ini juga diketahui bahwa temperatur 140°C menjadi daerah transisi awal terjadinya fenomena yang mengakibatkan droplet tidak bersinggungan dengan permukaan panas sehingga proses perpindahan kalor antar permukaan terhambat.
Energy profile and improvement proposal of a sawdust charcoal briquette factory Akmal Irfan Majid; Syafik Maulana; Willie Prasidha
Jurnal Penelitian Saintek Vol 27, No 1 (2022)
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v1i1.48513

Abstract

This study aimed to analyze the profile of energy consumption and identify efforts to improve energy efficiency. In the present work, the evaluation was focused on the main production lines, including energy utilities sourced from electricity as well as an analysis of thermal energy-based equipment. A medium-scale charcoal plant in Yogyakarta was selected as the object of the present study to represent the characteristics of a sawdust charcoal briquette industry. Measurements of electrical current were made using a clamp meter to determine the utility of the electrical devices while an infrared thermal camera was used to determine the temperature distribution. Results of this study indicate that thermal energy has the largest proportion in the main production line. Some points of heat concentration were found which could potentially cause hazards and thermal discomfort. Ideas for improvement were also proposed qualitatively as a recommendation
Karakteristik Unjuk Kerja Mesin Diesel Menggunakan Bahan Bakar B100 dan B20 Dalam Jangka Panjang Wiliandi Saputro; Jayan Sentanuhady; Akmal Irfan Majid; Willie Prasidha; Nico Pradipta Gunawan; Thevin Yoga Raditya
Journal of Mechanical Design and Testing Vol 2, No 2 (2020): Articles
Publisher : Departemen Teknik Mesin dan Industri, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (137.135 KB) | DOI: 10.22146/jmdt.55523

Abstract

Penggunaan bahan bakar alternatif selalu berkaitan dengan dua masalah global, yaitu meningkatnya penggunaan minyak mentah dan cadangan minyak yang semakin menurun. Disamping itu, sumber energi alternatif menjadi topik yang menarik untuk terus dikaji. Indonesia adalah salah satu negara penghasil minyak kelapa sawit terbesar di dunia dengan nilai produksi mencapai 51,8 juta ton pada tahun 2019. Salah satu sumber energi alternatif yang dapat diolah dari minyak sawit adalah biodiesel. Biodiesel dapat digunakan secara langsung sebagai bahan bakar untuk mesin diesel. Tetapi biodiesel memiliki karakteristik yang berbeda dengan solar sehingga akan mempengaruhi unjuk kerja dan hal lainnya pada mesin. Oleh karena itu, penelitian ini akan menentukan pengaruh penggunaan biodiesel terhadap unjuk kerja mesin yang mencakup daya mesin, torsi, konsumsi bahan bakar spesifik (SFC), dan efisiensi termal. Bahan bakar yang digunakan adalah B100 (100% biodiesel minyak sawit) dan bahan bakar B20 (20% biodiesel minyak sawit + 80% solar) sebagai pembandingnya. Pengujian dilakukan selama 300 jam operasi, dengan beban konstan berupa lampu halogen sebesar 4 kW. Menurut hasil penelitian, mesin berbahan bakar B100 menghasilkan daya, torsi, dan efisiensi termal yang lebih rendah masing-masing sebesar 2,17%; 0,76%; dan 1,25% serta menghasilkan SFC yang lebih tinggi sebesar 14,61% bila dibandingkan dengan mesin berbahan bakar B20. Hal tersebut dikarenakan karakteristik bahan bakar B100 yang memiliki nilai kalor lebih rendah dan viskositas serta densitas lebih tinggi dibandingkan bahan bakar B20.
Co-Authors Arif Widyatama Deendarlianto Gunawan, N. P. Jayan Sentanuhady Muhammad Akhsin Muflikhun Nico Pradipta Gunawan Prashida, W. Raditya, T. Y. Samsul Kamal Saputro, W. Syafik Maulana Teguh Wibowo Thevin Yoga Raditya Wiliandi Saputro Willie Prasidha