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Jurnal METTEK (Jurnal Ilmiah Nasional Dalam Bidang Ilmu Teknik Mesin)
Published by Universitas Udayana
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue "Vol 1 No 2 (2015)" : 5 Documents clear
Perancangan Gasifikasi Downdraft dengan Variasi Laju Aliran Oksigen sebagai Agen Gasifikasi Gusti Ngurah Agung Satria Prasetya D.Y; Made Sucipta; I Nyoman Suprapta Winaya
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 1 No 2 (2015)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

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Abstract

Abstract Biomass energy is energy derived from biological material from plants such as wood, rice husk, corn head, and other The process of conversion of biomass into energy can be process by combustion, pyrolysis, and gasification. The gasification process is a process of utilization of biomass by converting energy from a solid raw material (biomass) into syn-gas (the synthesis gas) that can later be used as fuel. One example of gasification that has been developed is a downdraft system. Gasification process has several factors that affect the process and content of syngas dihasillkannyaie, characteristics of biomass gasifier designs, types of agents gasifikasinya, and the air-fuel ratio. In this study the gasification reactor is designed to use black steel pipe diameter of 6 "with a height of 1 meter reactor. Agent oxygen gasification syngas selected to obtain better results, the oxygen flow rate by 2, 4, and 6 liters per minute, and the use of wood as fuel shaved. The results were obtained variation of the oxygen flow rate of 4 lpm produce useful energy and efficiency are the highest, followed at 6 lpm oxygen flow rate, and the lowest last on oksegen flow rate of 2 lpm. This is in addition influenced by the percentage of syngas CO, CH4 and H2, is also influenced by the length of the gas utilization that occurred in each valiari oxygen flow rate. By which time the utilization of this gas will affect the actual value SA which determines the number of moles of syngas CO, CH4 and H2.
Daur Ulang Oli Bekas Menjadi Bahan Bakar Diesel dengan Proses Pemurnian Menggunakan Media Asam Sulfat dan Natrium Hidroksida I Nyoman Suparta; Ainul Ghurri; Wayan Natha Septiadi
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 1 No 2 (2015)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

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Abstract

Consumption of processed oil to always increase every year in line with the increase in population and activity of the world's population. Alternative energy also intensively carried out in order to save fuel consumption mainly on transport and existing conventional machines. Various attempts and studies have been done to save diesel fuel in diesel engines, among others, by using bio-diesel derived from plants. Besides the need for fuel increases with the progress of the construction industry and the rest from industrial processes and machinery that can not be handled properly is waste that number continues to rise, among other things used oil. Therefore, the oil is taken from petroleum, the hydrocarbon is a compound that has an energy value and flammable, it is necessary to look for ways to utilize primarily used oil fuel.Therefore it is necessary to find a way to utilize the used oil as a fuel in a diesel engine with an easy and inexpensive process.
Analisa Perawatanpada Komponen Kritis Mesin Pembersih Botol 5 Gallon PT. X dengan Menggunakan MetodeReliability Centered Maintenance(RCM) Ida Bagus Gde Ardhikayana; I Nyoman Suprapta Winaya; I Gusti Ngurah Priambadi
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 1 No 2 (2015)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

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Abstract

Industri Air Minum Dalam Kemasan (AMDK) dewasa ini semakin berkembang. Meningkatnya permintaan dari konsumen berbanding lurus dengan meningkatnya jumlah produsen serta pelaku  industri AMDK. Salah satu pelaku industry AMDK ini adalah PT.X, yang mana memiliki beberapa produk AMDK, salah satunya berupa produk AMDK ukuran 5 gallon, atau 19 liter. Sistem produksi returnable dilakukan pada proses pengemasan AMDK gallon ini. Dalam proses tersebut digunakan system mesin pencucian yang mana digunakan secara kontinyu sehingga tidak dapat dielakkan, terdapat penurunan performa signifikan. Hal ini dialami pula oleh PT.X sehingga mengakibatkan cost downtime atau kerugian signifikan pada perusahaan. Untuk menjaga agar mesin produksi tetap berjalan sebagaimana mestinya maka digunakanlah sistem manajemen pemeliharaan (maintenance) mesin produksi.Perawatan peralatan mesin yang mempunyai tingkat kekritisan yang tinggi memerlukan perhatian khusus karena peralatan mesin tentunya sangat berpengaruh terhadap kelancaran produksi. Dalam mencapai tingkat keberhasilan maksimal dalam proses maintenance tersebut, dibutuhkan metode yang tepat dalam pelaksanaannya. Menggunakan metode RCM merupakan cara yang efektif untuk menemukan komponen kritis penyebab kegagalan mesin, serta meminimumkan waktu dengan TMD yang diperoleh pada minggu ke 9, mendekati waktu standar cycle mesin menjadi dasar dilakukannya perawatan secara berkala pada minggu tersebut. Pentingnya melakukan perawatan pencegahan dan penggantian  untuk mengurangi kegagalan yang terjadi secara dini, dapat dilihat dari peningkatan efisiensi produktivitas sebesar 0,13%.     Kata kunci: AMDK, performa, Maintenance, Downtime, RCM
Analisis Performansi Reaktor Gasifikasi Updraft Dengan Bahan Bakar Tempurung Kelapa I Gede Hendra Gunawan; Made Sucipta; I Nyoman Suprapta Winaya
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 1 No 2 (2015)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

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Abstract

Coconut shell can be easily obtained because of abundant and for now it is only used as charcoal only. By knowing the chemical composition and content contained in coconut shell, the material can be used as a source of alternative energy through a gasification process gasifikasi.Ada several types ie Fixed Bed Gasification updrafts, Downdraft and Crossdraft. In this study the gasification process using a reactor made of black steel with high dimensional reactor 70 cm from the bottom of the buffer to cover the top of the reactor and the reactor diameter of 8 inches. Air flow rate is used as the gasification agent, according to the theory stoichiometry of 37 lpm (liters per minute). Fuel used for the gasification process is coconut shell. From the research menunujukan gasification process can produce gas capable of combustion (CO, CH4, H2) continuously for 900 seconds, the resulting actual FCR is 9.716 kg / h, which generates CO content = 13.32%, 1.52% CH4 = , H2 = 4.68%, N2 = 37.09% and CO2 = 38.21%, 5.91 MJ of energy produced and the efficiency of gas by 28.8%. Updraft gasification process is still not perfect because of the results of the average temperature in the oxidation zone is 246,90C and CO2 = 38.21%, the gasification process refers more to the combustion process. Keywords: Performance reactor, gasification updrafts, coconut shell
Uji Variasi Tekanan Nosel Terhadap Karakteristik Semprotan Bahan Bakar Biodiesel I Wayan Suma Wibawa; I Gusti Bagus Wijaya Kusuma; I Nyoman Budiarsa
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 1 No 2 (2015)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

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Abstract

In the middle of the thinness of the availability of fossil fuels, making researchers from various countries are aggressively seeking alternative energy sources that can be renewed, one of which is biodiesel from callophyluminophylum. Callophyluminophylum use of biodiesel in diesel engines still experiencing problems, due to the viscosity and density higher than petroleum diesel it results in the performance of the diesel engine is not optimal. One solution to overcome the above problems is to put more pressure on the injector so that the spray is more subtle, then tested the effect of pressure injector / nozzle of the spray characteristics. The variations in the pressure nozzle 90 bar, 100 bar, 110 bar, 120 bar and 130 bar (range working pressure nozzle from the factory) using petroleum diesel (100%), callophyluminophylum biodiesel 100% and callophyluminophylum biodiesel 5% + petroleum diesel 95 %. Fuel spray characteristics test in the penetration of the spray tip length (L), spray rate (v or Uin), spray angle (?), and distribution of large granules are formed on each - each variation of pressure. From the testing that was done then get the following, at a pressure of 120 bar nozzle BD 5% has characteristics that most closely D 100% (petroleum diesel) both of the speed of the spray, spray angle and the amount of the grain. Key words: Pressure nozzle, the length of the spray, spray time, spray angle, the distribution of grain.

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