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INDONESIA
Jurnal Energi Dan Manufaktur
Published by Universitas Udayana
ISSN : 23025255     EISSN : 25415328     DOI : -
Core Subject : Science, Engineering,
Energy Industrial & Manufacturing Engineering
"Jurnal Energi dan Manufaktur" is a journal published by Department of Mechanical Engineering, University of Udayana, Bali since 2006. During 2006-2011 the journal's name was "Jurnal Ilmiah Teknik Mesin CAKRAM" (Scientific journal in mechanical engineering, CAKRAM). "Jurnal Energi dan Manufaktur" is released biannually on April and October, respectively. We invite authors to submit papers from experimental research, review work, analytical-theoretical study, applied study, and simulation, in related to mechanical engineering (energy, material, manufacturing, design) to be published through "Jurnal Energi dan Manufaktur".
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Articles 12 Documents
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Search results for , issue "Vol 5 No 1 (2012): Oktober 2012" : 12 Documents clear
Peningkatan Efisiensi Absorbsi Radiasi Matahari pada Solar Water Heater dengan Pelapisan Warna Hitam NK. Caturwati; Yuswardi Y; Nino S
Jurnal Energi Dan Manufaktur Vol 5 No 1 (2012): Oktober 2012
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Indonesia is a country which is get sun exposure throughout the year due to geographically located aroundthe equator. Utilization of solar energy as a source of renewable energy should be encouraged in order toconserve the use of fossil energy sources dwindling availability. This paper presents the use of sun energyas water heater (Solar Water Heater). The experimental method is studies comparing the performance ofsolar water heater with genuine copper pipe collector and copper pipe which was coated a black paint. Thestudy was conducted in Cilegon area for all day from 08:00 am until 05:00 pm with a one hour samplingperiod for 10 days. From data collector inlet-outlet water temperature and environmentally condition inwhich testing is done, furthermore was calculated the energy absorption efficiency by solar water heater.Theoretically, the absorption of energy radiation by a black body is the best. Results of the study is the pipecollector with black paint coating had higher energy absorption efficiency up to 31 times than the copperpipe collector with no coating.
Studi Eksperimental Pengaruh Variasi Bahan Kering Terhadap Produksi dan Nilai Kalor Biogas Kotoran Sapi I Putu Awing Wiratmana; I Gusti Ketut Sukadana; I Gusti Ngurah Putu Tenaya
Jurnal Energi Dan Manufaktur Vol 5 No 1 (2012): Oktober 2012
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Biogas produced from the fermentation of organic matter by anaerobic bacteria. The calorific valuecontained in biogas depends on the concentration of CH4. Tthe production of CH4 in biogas is affected by CNratio on dry matter which is between 25:1 - 30:1. Cow manure has a C-N ratio of 18:1, so it should beadded to other materials, namely rice husk which has a C-N ratio of 65:1. The purpose of this study is toinvestigate the effect of the addition of rice husk to the production and calorific value of manure biogas.Thetest was performed with a batch system with the addition of15%, 18%, 21% and 24% of the total rice husk100% by weight of dry ingredients used. Observed data was a water manometer height change (?h), themass of biogas and gas composition on biogas.The results shows that the addition of 21% rice husk 100%had the highest production of 0.0597 kg and the highest calorific value is 55,017 kJ and 75.034 kJ byeksperimental and theoretical with CH4 compositon was found 80%.
Pengaruh Post Weld Heat TreatmentTerhadap Sifat Mekanis dan Korosi Sambungan Las Spiral Saw pada Pipa Baja ASTM A252 Ipick Setiawan; Mochammad Noer Ilman
Jurnal Energi Dan Manufaktur Vol 5 No 1 (2012): Oktober 2012
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Metal joint with welding system is increasingly used. i.e structure, piping or machine constuction. Some ofthe problems on welding is residual stress dan over hardness can decrease the weld toughness stresscorrosion cracking. An effort to solve this problem is PWHT. PWHT has multiple functions, those are toreduces residual stress,increases ductility of HAZ and improves toughness in weld metal and HAZregions.Heating process with various temperature is expected to make optimum PWHT temperature.Thisexperiment was carried out to know the effect of PWHT torwad the toughness an corrosion of helicalwelding pipe ASTM A252. The welding process use SAW with groove double V, electrical current 375 A ,voltage 35 V and heat input 2,8 kj/mm. Post weld heat treatment was carried out at various temperature450oC, 550oC and 650oC during 3 hours followed by cooling process in furnace after that, these specimensware tested the hardness, tensile strength, toughness and corrosion. The Result of research show thatincreasing of PWHT temperature, can increase the toughness and corrosion resistance of joint weldin, butthe tensile strength is decreasre. The optimum PWHT temperature is 550o C with toughness 81 J at 0O C.
Pemurnian Biogas Dari Gas Pengotor Hidrogen Sulfida (H2S) Dengan Memanfaatkan Limbah Geram Besi Proses Pembubutan Komang Metty Trisna Negara; Tjokorda Gde Tirta Nindhia; I Made Sucipta; I Ketut Adi Atmika; Dewa Ngakan Ketut Putra Negara; I Wayan Surata; A.A.I.A. Sri Komaladewi
Jurnal Energi Dan Manufaktur Vol 5 No 1 (2012): Oktober 2012
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

This research is intended to utilize waste steel chips from the process of turning (process in which lathemachine is used) for purification of biogas from the gas of hydrogen sulfide (H2S) contaminant to supportthe promotion of zero waste industrial and manufacturing process in the world. The waste of Iron chips iscollected and selected. Only long and spiral like of iron chips that are useful for this purpose. Since thechips having residual stress due to strain hardening during turning process, then the annealing processshould be done before compacting to form a billet.The thickness of the billet was 1 cm and 6 cm indiameter with weight 500 gram. The annealing proces was carried out by burning the iron chip until reachthe red color of fire. During the annealing process the iron inside the steel will react with oxygen to formiron oxide (Fe2O3) and if during oxidation there is a water vapor in the air then the iron bog ore Fe(OH)3 willbe formed. Both of Fe2O3 and Fe(OH)3 are very reactive to H2S and therefore able to eliminate the H2Scontaminant inside the Biogas. The billet is used as a filter and to be installed in the line of biogasdistribution. The result indicate that the the iron chips is potential to be utilized to reduce the H2Scontaminant in the biogas
Studi Eksperimental Pengaruh Bilangan Reynolds pada Keefektifan dan Koefisien Tekanan Penukar Panas Berkas Pipa Eliptik Susunan Berseling Budi Utomo Kukuh Widodo; Samsul Kamal; Suhanan .; I Made Suardjaja
Jurnal Energi Dan Manufaktur Vol 5 No 1 (2012): Oktober 2012
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Experimental studies have been conducted on the elliptic tube bundle with a diameter equivalent to 0.75inches and the aspect ratio (AR) = 2.Tube bundle arranged alternate with 4-3-4 configuration and pitchlateral (SL) = 1.5 X axis major axis. Meanwhile pitch transverse (ST) varied 1.5 and 2 X minor axis. TheTesting was carried out in a subsonic wind tunnel with wind speeds of 1 m / s - 12.6 m / s resultingReynolds number Reb = 346-6904 and operating temperature 49 oC, 59 oC and 69 oC. Seven tubesinserted an electric heater produces uniform heat flux 3718 W/m2 - 3751 W/m2. The results show that theeffectiveness of the heat exchanger (Q / P) varied from 3799 to 15, decreases exponentially at lowReynolds number and tends to asymptotic at Reynolds number above 1000. Meanwhile, the valuepressure coefficient (?p/0.5?V2) with value 3.4-10 decreased continuously at low Reynolds numbers andasymptotic at high Reynolds number. In general, a bundle with a smaller ST has greater effectiveness andthe pressure coefficient ranges is wider. Changes in operating temperature conseqwenly no effect on theeffectiveness and the pressure coefficient at high Reynolds number.
Studi Numerik dan Eksperimental Karakteristik Dinamik Model Sistem Suspensi Asnawi Lubis; Zulhendri Hasymi
Jurnal Energi Dan Manufaktur Vol 5 No 1 (2012): Oktober 2012
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

AbstrakKarakteristik dinamik suatu struktur mesin sangat penting untuk diketahui untuk menghindari getaran yangberlebihan pada struktur tersebut. Karakteristik dinamik tersebut ditentukan oleh frekuensi pribadi,amplitudo dan modus getar. Getaran pada suatu struktur mesin dapat terjadi karena adanya eksitasi baikyang berasal dari dalam maupun dari luar sistem. Jika frekuensi eksitasi berada di sekitar frekuensi pribadisistem maka dapat terjadi fenomena resonansi, yang akan mengakibatkan amplitudo getaran yang tinggi.Amplitudo yang tinggi yang equivalent dengan defleksi dapat mengakibatkan kegagalan pada suatusistem mesin ataupun struktur. Tulisan ini melaporkan hasil kajian secara numerik dan experimentalterhadap karakteristik dinamik suatu model sistim suspensi. Sistim suspensi dimodelkan dan dianalisissecara numerik menggunakan metode elemen hingga dan diuji secara experimental menggunakanperangkat Universal Vibration System (UVS) untuk memperoleh karakteristik dinamik yang meliputifrekuensi pribadi dan amplitudo getaran. Hasil studi menunjukkan bahwa amplitodo makin besar padanodal atau posisi yang makin jauh dari tumpuan pegas.
Analisis Kinerja Alat Penukar Kalor Jenis Shell and Tube Pendingin Aliran Air pada PLTA Jatiluhur Yopi Handoyo; Ahsan .
Jurnal Energi Dan Manufaktur Vol 5 No 1 (2012): Oktober 2012
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

This paper presented a shell and tube heat exchanger with type BFU, that is by making its performanceanalysis. Result of this evaluation will be compared to appliance with performance prediction heatexchanger second with type BFS, besides result of the prediction will be compared to result of examinationof second type which done by in PLTA JATILUHUR. This analysis require to be done by because heatexchanger with type of BFU often happened leakage especially at rear head because at the shares quicklyhappened conglomeration of deposit. The detailed design on heat exchanger components was done basedon Standards of Tubular Exchanger Manufacturers Association (TEMA). The heat exchanger type that waschosen is BFS type with two shell and two tube passes. According to the chosen heat exchanger geometry,the fluid flow in shell side was analyzed by CFD software to find flow pattern and properties of this fluid.The result of fluid flow analysis with CFD software is accurate enough or close to the theoretical analysisresult. Therefore, it is important to analyze fluid flow along the shell in different surface of cross section withcertain spacing to find completed conditions of fluid. More detailed design and analysis of heat exchangeris needed to have a heat exchanger design that can be fabricated and have good performance.
Unjuk Kerja Destilasi Air Energi Surya I Gusti Ketut Puja; FA. Rusdi Rusdi Sambada
Jurnal Energi Dan Manufaktur Vol 5 No 1 (2012): Oktober 2012
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Clean water is daily needs for society, especially for drinking and cooking. Existing water sources oftenalready contaminated with dirt, salt (sea water), heavy metals, bacteria or other harmful materials. Thewater in this condition can be detrimental to health if used for drinking or cooking, hence the water has tobe rarefied first. There are many ways to purify contaminated water, one way is by distillation. Distillationprocess requires heat to evaporate the contaminated water before condensed and produce clean water.Thermal energy for distillation process can come from many sources, one of which is solar energy. Thepurpose of this study is to investigate the performance difference between solar powered water distillationthat uses parabolic collector and reflector with solar powered water distillation without the use of paraboliccollector and reflector (basic form). Distillated water will be tested in the laboratory to determine whetherthe water quality qualifies as drinking water or not after distillation process. Equipment which used in thisstudy consisted of contaminated water tanks, distillation apparatus and distillated water storage. Distillationapparatus has a length of 1 meter and 0.5 meters wide. There are three variations on the distillationapparatus used i.e. distillation with reflector, distillation with parabolic collector and distillation withoutreflector and collector (basic form). Distillation appliance is equipped with water depth indicator. Waterdepth inside the distillation varied i.e. 5 mm, 7.5 mm, and 10 mm. The results showed a maximum ofdistilled water produced is 0.850 liter in 2 hours with an average efficiency of 49.2% produced by thedistillation using reflector with 5 mm water depth. Maximum of distilled water yield with 10 mm water depthis 0.20 liter in 2 hours produced by distillation using parabolic collectors. Laboratory test stated that qualityof distilled water can be accepted as drinking water.
Pengaruh Penggunaan Suction Liquid Heat Exchanger dan Tube in Tube Heat Exchanger Pada Refrigerator Terhadap Daya Kompresor dan Waktu Pendinginan Ega Taqwali Berman
Jurnal Energi Dan Manufaktur Vol 5 No 1 (2012): Oktober 2012
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Penelitian ini bertujuan untuk membandingkan penggunaan SuctionLiquid Heat Exchanger (SLHX) danTube in Tube Heat Exchanger (TiTHX) pada refrigerator terhadap daya kompresor dan waktupendinginan. Data pengujian diukur pada temperatur beban pendinginan 60C sampai dengan temperatur -60C dan fluida kerja yang digunakan sebagai media pendingin adalah refrigeran 12. Hasil penelitiandiperoleh daya kompresor yang diperlukan oleh sistem refrigerasi yang menggunakan TiTHX 1,9 % lebihkecil daripada sistem refrigerasi yang menggunakan SLHX. Hal tersebut disebabkan oleh kerja kompresiyang dilakukan oleh sistem yang menggunakan TiTHX lebih kecil daripada sistem refrigerasi yangmenggunakan SLHX. Waktu pendinginan yang dibutuhkan untuk mencapai temperatur pengukuran padakondisi steady (60C) dan kondisi akhir (-60C) lebih singkat pada sistem yang menggunakan TiTHX daripadasistem yang menggunakan SLHX.
Penerapan Teknologi Las Gesek (Friction Welding) Dalam Proses Penyambungan Dua Buah Pipa Logam Baja Karbon Rendah Budi Luwar Sanyoto; Nur Husodo; Sri Bangun Setyawati; Mahirul Mursid
Jurnal Energi Dan Manufaktur Vol 5 No 1 (2012): Oktober 2012
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Kata kunci: waktu gesek, las gesek, tekanan tempa, baja karbon rendah, pipa airAbstractThe welding process of the carbon steel pipe will be abit difficult since during welding it is needed rotarymovement of the pipe in order to the operator easily to join the welding. This difficulty can be overcome byapplying friction welding technology. This method is strongly influenced by friction time, rotation velocityand pressure of the pressing. Therefore it is needed the research to joint the carbon steel pipe by applyingfriction welding. The variation time for the friction welding test were 15, 20, 25, 30 and 35 second. Theprocess parameters were keep constant. The friction welding machine was operated with 4125 rpm, frictionpressure 15 kg/cm2 and pressure about 70 kg/cm2.The specimen obtained was tested for metallographic,hardness test. The metallography test was done recognize the microstructure and the hardness test wasconducted to obtain the hardness distribution in the original material, in the HAZ region, and in the weldingmetal. Analyses for the value of hardness in the three region namely, origin metal, HAZ, and welding metalwill be related to the change in microstructure.The longer the time for the friction, the temperature increaserespectively. But the increase the temperature affect on the upset value become larger and the samplebecome shorter. The research for joining with friction welding 4125 rpm, friction pressure 15 kg/cm2 andthresure 70 kg/cm3 can be concluded that frinction time that is recomended is 35 second.Friction weldingmethod can be applied for the joining low carbon steel pipe. The microstructure in the joining was found notsignificant change that mean there is no change in mechanical properties

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