R.E.M. (Rekayasa Energi Manufaktur) Jurnal
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Effect of Air Fuel Ratio to Quality of Municipal Solid Waste Using Downdraft Gasification: Pengaruh Air Fuel Ratio Gasifikasi Sampah Padat Perkotaan Menggunakan Gasifikasi Tipe Downdraft Terhadap Kualitas Gasifikasi
No full textGasifikasi menggunakan limbah padat kota (MSW) berdampak pada peningkatan kualitas lingkungan dan peningkatan pasokan listrik untuk daerah-daerah yang sulit dijangkau, khususnya di Indonesia. Namun proses gasifikasi membutuhkan proses pengujian kualitas terlebih dahulu agar dapat menghasilkan produk syngas dan kelistrikan yang maksimal. Maka dalam penelitian ini dilakukan proses pengujian pengaruh variasi Air Fuel Ratio (AFR) terhadap kualitas proses gasifikasi (Cold Gas Efficiency (CGE), Carbon Conversion Efficiency (CCE), dan specific fuel consumption (sfc) atau konversi konsumsi spesifik). Penelitian dilakukan dengan melakukan proses gasifikasi dengan tipe downdraft pada nilai AFR 0,5; 0,51; 0,53; 0,54; 0,55. Hasil penelitian ini menunjukkan adanya peningkatan nilai syngas seiring dengan peningkatan nilai AFR. Sedangkan nilai CGE meningkat seiring dengan meningkatnya AFR proses gasifikasi MSW. Peningkatan terjadi dari 9 menjadi 13%, meskipun hasil ini masih sangat rendah. Di sisi lain, CCE juga mengalami peningkatan dengan meningkatnya AFR gasifikasi MSW. Peningkatan nilai terlihat dari 33-43%. Hasil ini juga masih tergolong kecil, artinya efisiensi konversi karbon pada proses ini sangat rendah. Pada akhirnya, dapat dilihat bahwa nilai scf menurun dengan meningkatnya AFR. Penurunan yang didapat adalah dari 5,3 menjadi 2
Effect of Green Body Heating Rate on Mechanical and Physical Properties of Crucible Materials Made from Evaporation Boats Waste: Pengaruh Laju Pemanasan Green Body Terhadap Sifat Mekanis dan Fisis Material Crucible Berbahan Limbah Evaporation Boats
No full textLimbah evaporation boats merupakan limbah yang tidak dapat terurai tetapi memiliki daya tahan panasyang sangat tinggi sehingga perlu dimanfaatkan. Penelitian ini bertujuan untuk mengetahui pengaruh darilaju pemanasan terhadap sifat mekanis dan fisis material crucible yang terbuat dari limbah evaporation boats.Variasi laju pemanasan yang digunakan yaitu 2, 4, 6, 8, dan 10°C/menit saat proses pembakaran di dalam furnace.Komposisi material crucible menggunakan perbandingan berat limbah evaporation boats 70%, grafit 15%,kaolin 7,5%, castable SK-34 7,5%, dan 15% air bersih dari total berat campuran. Setiap bahan diayak denganayakan 100 mesh. Bahan tersebut dicetak menjadi spesimen sesuai standar ASTM C373-72 dengan tekanankompaksi sebesar 40 MPa. Pembakaran menggunakan temperatur 1000°C dan waktu penahanan selama 2 jam.Spesimen diuji kuat tekan, kekerasan Vickers, densitas, struktur mikro. Kuat tekan tertinggi sebesar 29,829 MPapada laju pemanasan lambat 2°C/menit. Nilai kekerasan terendah sebesar 12,64 HVN pada laju pemanasan10°C/menit. Nilai densitas tertinggi sebesar 2,39 g/cm 3 pada laju pemanasan 2°C/menit, sedangkan nilai terendahadalah 1,99 g/cm 3 pada laju pemanasan cepat 10°C/menit. Hasil struktur mikro pada laju pemanasan 2°C/menitmenghasilkan struktur distribusi fasa yang paling seimbang dan kepadatan terbaik pada material crucible
Potential and Challenges of Hydrogen Development as New Renewable Energy in Indonesia
Full text linkThe use fossil energy consumption in Indonesia is increasing along with population growth and industrial development. Fossil energy oil and coal can produce greenhouse gas emissions and environment pollution. The largest producer of CO2 emissions comes from exhaust gases in the production process and motor vehicles. Indonesia's energy mix target in 2025 is around 23% from New and Renewable Energy (NRE). Given the importance of using NRE, Indonesia is starting to look for alternative energy that is environmentally and sustainable, like hydrogen energy. Green hydrogen technology has the potential to be developed in Indonesia. Hydrogen production processes commonly carried out are through the electrolysis of water, methanol, and biomass. The use of hydrogen can be applied to motor vehicles and power plants. Hydrogen can reduce greenhouse gas emissions. However, Indonesia has problems in developing green hydrogen technology, one of which is the high production cost, so it requires other parties to develop it
Design and Fabrication of a Semi- Automatic Shoe Polishing Machine for Small Scale Business
Full text linkShoe is generally made from leather which requires extreme care and regular polishing to maintain its shiny appearance. This work attempts to develop a semi-automatic shoe polishing machine for small scale enterprises. The machine is intended to grip the shoe at the right place, apply a layer of polishing wax all around the shoe and perform buffing action to obtain a shiny and assure minimum damage to the shoe. This semi-automatic shoe polishing machine is designed to consist of screw mechanism, a shaft, two bearings, two pulleys, belt, two fibred brushes, an electric motor and springs for gripping the shoe. The developed machine is limited to standard shoe sizes and capable of polishing a pair of shoes in 175 seconds
Composite Floor Chair Waste Mangrove Fruit Flour
Full text linkOne of the business sub-sectors that is capable of driving trade and development in Indonesia is the Handicraft Industry. One such craft industry is to utilize the potential of mangrove forests as economic management that manages with expertise, as well as creative, innovative, and commercial ideas so that it fosters interest and encourages people to develop ideas. Seeing from the potential availability of raw materials, this innovation is intended to utilize propagules as composite reinforcing materials, this innovation is carried out with the aim to model the floor chairs with propagules (Rhizophora mangrove fruit). This modeling uses the mixing of resin and powder propagules. The results show that it can be done by modeling floor chairs MangKoe using molds. This chair can hold back loads up to 70 kg
Perancangan Mekanisme Pelurusan Kawat SAE 304 (UNS S30400) Galvanized Menggunakan Prinsip Pengerolan: Design of SAE 304 (UNS S30400) Galvanized Wire Straightening Mechanism using Rolling Principle
No full textWire is a complement material on the manufacturing product. Therefore, the wire processes usually bestowed to the middle-low industry. Cutting and straightening wire processes are the most basic process for wire materials. In the middle-small industry, demand of wire materials is 150 kg per day. Seeing this potential, the design of a wire straightening mechanism for middle-low industries is necessary to maximize productivity. The main purpose of wire straightening mechanism design is calculating roll diameters and placement to obtain appropriate rolling force. In designing this wire straightening mechanism, the raw materials are used 3 mm SAE 304 (UNS S30400) Galvanized. The rolling method used in this mechanism is Three-Roll Bending. The empirical method is used on this analysis. Based on the analytical results, roll used on this mechanism are 5 pieces or equal with 3 cycle of rolling process with 40 mm of diameters. The vertical gap between center of rolls is 41.5 mm with 54 mm horizontal gap. Rolling force produced by the analytical roll dimension is 1608.69 N/cycle and that’s enough to give plastic deformation on the 3 mm SAE 304 (UNS S30400) Galvanized wire
The Effect of Fluid Velocity and Zig Zag Filter Foam Filler Distance on the Effectiveness of Cooling Tower: Pengaruh Kecepatan Fluida dan Jarak antar Zig Zag Filter Foam Filler terhadap Efektifitas Cooling Tower
No full textoai:journal.umsida.ac.id:article/168This study aims to determine the effect of fluid velocity and the distance between the zig zag filter on the cooling tower by varying the distance between the zig zag bio filter foam. In this study, bio filter foam material was used in a zig zg shape using wire mesh where the distances tested were 5cm, 10cm, and 15cm. Then the water is heated using a heater until it reaches a temperature of 40ºC and then the water is flowed up by a pipe using a pump and removed using a nozzle, then the hot water will go down to the reservoir by passing the bio filter foam arrangement that has been installed with a distance of 5cm , 10cm, and 15cm. Where there is also a drain valve that is done, namely a closed faucet and also an open kran and fully open faucet. A good cooling value is shown at a distance of 5 cm where the average temperature difference is 3.47 C and the effectiveness is 26.67%
(Performance of Gas Turbine Cooling System (Radiator) at PLTGU XYZ against Environmental Air Temperature): Unjuk Kerja Sistem Pendingin (Radiator) Turbin Gas pada PLTGU XYZ Terhadap Temperatur Udara Lingkungan
Full text linkThe heat exchanger is an important component in the gas and steam power plant (PLTGU) industry. One of the most important heat exchangers in gas turbine cooling systems is the gas turbine radiator. The gas turbine radiator functions to cool the cooling water, which circulated to various components of the gas turbine by using environmental air as the cooling medium. The purpose of this study was to determine the effect of environmental temperature on the performance of gas turbine radiators and to compare operational data in 2017 with operational data when the study conducted in 2019. Data collected for 3 days with 2-3 hour intervals. Data processing and analysis shows that the higher the ambient temperature, the higher the radiator effectiveness value. Data in 2017 shows the highest average value of effectiveness obtained at an ambient air temperature of 35 ˚C of 71,274%. Meanwhile, data in 2019 shows the highest average value of effectiveness at an ambient air temperature of 35 ˚C of 58,859%. Thus, the average effectiveness value of gas turbine radiators has decreased by 12,415% from 2017 to 201
Static Stress Analysis and Fatigue Life Prediction of Rocket Motor Test Stand Using Numerical Simulation
Full text linkThe rocket motor test stand is the equipment used to test the rocket motor's performance under controlled conditions. This equipment is used to measure the thrust of the Dextrose rocket motor and test the ability of components such as the tube, fuel, nozzle and cap of the rocket itself. Before the Dextrose rocket flight test is carried out, it must go through this test. In this study, the variations in the thrust are 2000, 2250, 2500, 2750, and 3000 N. The rocket motor test stands used Aluminum 6063-T6 which has light density and medium strength. Numerical simulations were carried out with Ansys Workbench software using the finite element method. The results of the static stress analysis show that the greater the thrust, the greater the maximum von Mises stress and deformation. It is inversely related to the safety factor. The greater the thrust, the lower the safety factor of the rocket motor test stand. The results of the fatigue simulation show that the greater the thrust, the lower the prediction of fatigue life and the safety factor. Rocket motor test stand fails to reach a 1 million cycle life at 3000 N thrust
Analisis Sifat Mekanik Komposit Bahan Kampas Rem Dengan Penguat Serbuk Kayu Jati Dan Serbuk Kuningan: Analysis Character Of Mechanics Composite Brake Pads Material With Amplifier Teak Wood Powder And Brass Powder
No full textThe purpose of this research for analyze composite material reinforced tesk wood powder and brass powder and epoxy resin matriks as brake pads material. The mix of composite brake pads divided into three kinds are Spesimen A, Spesimen B, Spesimen C, with different material composition next made to be mixing process, compacting, and sintering. This testing done with way test violence through Brinell method, test of wear rate use tool of Ogoshi high speed universal wear testing machine produce data of highest violence composite owned by Spsesimen A with score 10 HBN and highest wear rate owned by Spesimen C with score 0.0004 Kg/mm2. Composite material teak wood powder and brass powder and epoxy resin matriks have character of mechanics if composite have score of big violence so wear rate will more low and otherwise if composite have score of little violence so the wear rate will more high