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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".
Arjuna Subject : -
Articles 387 Documents
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Analisis Beban Kerja Mahasiswa Praktek di Bengkel Teknologi Mekanik Jurusan Teknik Mesin Politeknik Negeri Bali M. Yusuf; Anom Santiana
Jurnal Energi Dan Manufaktur Vol 7 No 2 (2014): Oktober 2014
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Bengkel teknologi mekanik adalah salah satu tempat praktikum mahasiswa di Jurusan TeknikMesin Politeknik Negeri Bali. Praktikum yang dilakukan antara lain adalah praktek pembubutan,praktek pemotongan plat, dan praktek pengelasan. Aktivitas praktikum dilakukan biasanyaberlangsung 4 sampai 6 jam dengan sekali istirahat. Di akhir praktek para mahasiswamenunjukkan gejala-gejala yang mengharuskan perlu adanya evaluasitentang aktivitas yangdilakukan, khususnya dilihat dari beban kerja. Gejala-gejela terrsebut tergambar darikeluhansubyektif seperti merasa lelah, haus, pegal di beberapa bagian tubuh, dan terkadang ketelitianhasil praktikum yang kurang memuaskan. Untuk itu dilakukan suatu penelitian secaraobservasional terhadap mahasiswa yang melakukan praktek di bengkel teknologi mekaniksebanyak 28 mahasiswa. Praktikum yang dilakukan adalah praktikum pembubutan, pemotonganplat, dan pengelasan. Untuk mengevaluasi beban kerja dilakukan pengukuran terhadap denyutnadi kerja, ECPT (extra calorie due to peripheral temperature), ECPM (extra calorie due toperipheral metabolism), mikroklimat ruangan, keluhan subjektif, dan keluhan otot skeletal.Mikroklimat yang diukur adalah intensitas cahaya, kebissingan, suhu kering, suhu basah, dankelembaban lingkungan. Dari hasil penelitian diperoleh bahwa beban kerja mahasiswa tergolongsedang, ECPM>ECPT, terjadi peningkatan keluhan otot dan kelelahan secara umum padamahasiswa. Untuk itu perlu diupayakan adanya intervensi ergonomi pada sistem praktikum.Karena ECPM>ECPT maka upaya-upaya intervensi diarahkan kepada pelaksanaan tugaspraktikum seperti sikap kerja, jam praktikum, pengaturan istirahat, kesesuaian antropometri alatkerja dan semacamnya.Kata Kunci : Analisis beban kerja, mahasiwa praktek, bengkel teknologi mekanikThe workshop of mechanical technology is one of the place for practicum for a student in theDepartment of Mechanical Engineering State Polytechnic of Bali. The Practicum that areconducted among others are the practice of turning, cutting plate, and welding practices.Practicum activities usually lasts 4 to 6 hours with one time for break. At the end of the practice,the students showed symptoms that require the need for an evaluation of the activitiesundertaken, in terms of workload. The symptoms is drawn from subjective complaints such asfeeling of tired, thirsty, sore in some parts of the body, and sometimes accuracy unsatisfactory labresults. Observational study was carried out on students who practice in the workshop ofmechanic technology as many as 28 students. Lab practicum done is turning, cutting plate, andwelding. To evaluate the work load on the pulse measurement work, ECPT (extra calorie due toperipheral temperature), ECPM (extra calorie due to peripheral metabolism), microclimates room,subjective complaints, and skeletal muscle complaints. Microclimates were measured lightintensity, noise, dry temperature, wet temperature, and humidity of the environment. The resultshowed that the workload of students classified as moderate, ECPM> ECPT, an increase inmuscle complaints and fatigue in general to students. Therefore it is necessary for ergonomicsintervention on lab system. Because ECPM> ECPT the intervention efforts directed towards theimplementation of practical tasks such as work attitude, practicum hours, setting a break,anthropometric suitability of working tools and the like.Keywords: Workload analysis, student practice, mechanical technology workshop
Efek Dendrite Arm Spacing terhadap Sifat Mekanis Paduan Perunggu Cu-20%Sn I Ketut Gede Sugita; R. Soekrisno; I Made Miasa; Suyitno -
Jurnal Energi Dan Manufaktur Vol 4, No.2 Oktober 2010
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

The purpose of this work is to investigate the effect of dendrite arm spacing on mechanical properties bronze20%Sn alloys The commercial pure copper and tin were melted in crucible furnace at temperature 1000oC. The molten metalwas casted in permanent moulds which have variation temperature, i.e. 35oC, 200oC, 400oC. The history of coolingtemperature on castings was recorded using a computer aided data acquisition Lab view 8.2 system.The microstructure and mechanical properties of this alloy have been investigated. The results of this researchindicate that decreasing the mould temperature affected on increasing solidification rate that caused to reduce thesolidification time. On the other hand, the difference of solidification rate have effected on microstructure forms. Thedendrite arm spacing (DAS) decreases with increasing solidification rate. DAS affected on mechanical properties i.e.ultimate tensile strength and hardness as cast. The mechanical properties increase with decreasing DAS.
Analisa Performa Kolektor Surya Pelat Datar Bersirip dengan Aliran di Atas Pelat Penyerap I Gst.Ketut Sukadana; Made Sucipta; I Made Dhanu Wijaya
Jurnal Energi Dan Manufaktur Vol 4, No.1 April 2010
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Energi matahari merupakan salah satu sumber energi alternatif yang sangat mudah di peroleh di Indonesia bahkandianggap gratis, karena Indonesia merupakan Negara yang terletak di daerah khatulistiwa. Pemanfaatan energi surya sudahlama di lakukan oleh masyarakat Indonesia baik untuk pengering pakaian, kayu, dan hasil pertanian. Namun pemanfaatan darienergi matahari ini tidak dilakukan secara optimal. Oleh karena itu perlu dilakukan sebuah penelitian agar energi matahari yangada ini dapat dimanfaatkan dengan semaksimal mungkin. Kolektor surya adalah sebuah alat yang berfungsi untukmengumpulkan radiasi matahari dan mengubahnya menjadi energi kalor yang berguna. Penulis telah melakukan modifikasi yangdiharapkan dapat meningkatkan performa dari kolektor surya ini yaitu dengan merubah bentuk pelat penyerapnya. Modifikasiyang dimaksudkan adalah pada bagian siripnya, dimana pada pelat penyerapnya ditambahkan sirip yang diletakan diantarapelat penyerap dan penutup transparan atau mengarah ke atas.Penelitian ini telah dimulai dengan pembuatan dua buah kolektor yaitu kolektor surya pelat datar dengan pelatpenyerap berbentuk sirip yang mengarah keatas dan kolektor surya pelat datar tanpa sirip, yang kemudian selanjutnya dipasangalat pengukur di titik-titik tertentu pada kolektor. Luas kolektor yang dipilih adalah 1 m2, yaitu lebar kolektor, W = 0,5 m danpanjang kolektor, Lc = 2 m. Pelat penyerap, sirip, dan pelat bawah menggunakan pelat besi dengan ketebalan 1,2 mm ( =0,98 = 0,98) yang dicat hitam kusam (doff). Untuk penutup transparannya menggunakan kaca bening dengan ketebalansebesar 5 mm ( = 0,88 = 0,9). Bagian bawah dan samping kolektor diberi isolasi yang terdiri dari gabus (styrofoam)dengan ketebalan 10 mm ( = 0,045?.) dan triplek dengan ketebalan 4 mm ( = 0,012?.). Saluran udara dengankedalaman 8 cm. Jumlah sirip yang digunakan adalah 4 buah, dengan jarak peletakan sirip sama, baik antar sirip maupundengan isolasi samping.Energi berguna pada kolektor pelat bersirip ke atas memiliki nilai lebih besar dibandingkan dengan energi bergunapada kolektor pelat datar tanpa sirip dan untuk laju aliran massa 0,018 kg/s memiliki energi berguna paling besar, sedangkanenergi berguna paling rendah diperoleh pada laju aliran massa 0,012 kg/s.
Penerapan Total Productive Maintenance dengan menggunakan metode OEE pada turbin uap Type C5 DS II – GVS Joel Bastanta Perangin Angin; Evin Dunan Manurung; Alfian Hamsi Siregar
Jurnal Energi Dan Manufaktur Vol 10 No 1 (2017): April 2017
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak Secara harfiah, tidak ada barang ataupun benda buatan manusia yang tidak dapat rusak, mesin turbin uap misalnya. Namun kerusakan tersebut dapat dicegah dengan metode perawatan yang tepat demi masa pakai yang lebih lama. Penelitian ini menganalisis tentang penerapan Total Productive Maintenace (TPM) pada mesin turbin uap untuk peningkatan produktivitas dengan menggunakan metode Overall Equipment Efectiveness (OEE) di PT PP London Sumatera Indonesia, tbk. Didalam analisis TPM dengan menggunakan metode OEE ini ada terdapat enam penyebab kerugian yang disebut dengan Six Big Losses yaitu diantaranya : kerusakan peralatan, persiapan peralatan, gangguan kecil dan waktu nganggur, kecepatan rendah, cacat produk dalam proses, hasil rendah.Kesimpulan yang didapat adalah nilai rata – rata OEE selama tahun 2015 adalah 65,08 % masih dibawah standar. Nilai gangguan kecil dan waktu nganggur 85,44 % dengan total waktu 2449,54 jam, hasilCacat produk dalam proses2,52 % dengan total waktu 72,12 jam, hasilKecepatan rendah 11,58 % dengan total waktu 331,88 jam, hasil Kerusakan peralatan0,38 % dengan total waktu 11 jam, hasil Persiapan peralatan 0,08 % dengan total waktu 2,41 jam, hasil Hasil rendah 0. Kata kunci: Total Productive Maintenance, Overall Equipment Effectiveness, Six Big Losses,Maintenance, Turbin Uap Abstract Generally, there is nothing properties hand made without damaging, steam turbine engines as an example. But the damage can be prevent by the precise method maintenance in the machines for the long life time. This study analyzes the application of Total Productive Maintenance (TPM) at the steam turbine machinery to increase productivity by using the method Overall Equipment Effectiveness (OEE). In the analysis of TPM using OEE there are six causes of loss called Six Big Losses, such as: damage to equipment ( breakdown losses ), preparation of equipment ( set- up and adjustment ) , disorders of the small and idle time ( idling and minor stoppages ) low speed ( speed reduced losses ), defective products in the process ( rework losses ) , lower results (yield / scrap losses). The conclusion is the value - average OEE for 2015 is 65.08 % is below standard. The Value of Idling / Minor Stoppages Losses is 85.44 % with a total time of 2449.54 hours, the results of Yield / Scrap losses is 2.52 % with a total time of 72.12 hours, the results of Reduce Speed Losses 11.58 % with a total time of 331.88 hours, the results of Breakdown Losses is 0.38 % with a total time of 11 hours, the results Setup and Adjustment Losses is 0.08 % with a total time of 2.41 hours, the results of Rework Losses 0. Keywords: Total Productive Maintenance, Overall Equipment Effectiveness, Six Big Losses,Maintenance, Turbin Uap
Kolektor surya jenis sirkular dengan memanfaatkan neon bekas sebagai kaca penutup I Ketut Gede Wirawan
Jurnal Energi Dan Manufaktur Vol 3, No.2 Desember 2008
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

To reduce the dependence to conventional energy resource, an effort to develop alternative energy application should be considered. One of them is the solar energy. Tubular solar thermal collector is a device to absorb the solar energy in from of thermal energy and transfer it into fluid. In water heating process, the solar collector which consists of some ex turbular lamp as cover glass, and finned absorber pipes, is designed and will be studied to obtain its performance. The mass flow rate amd inlet temperature of working fluid must be adjusted to achive the highest efficiency for a certain tubular solar collector.The experiment to examine the performance of the device done from 10.00 AM to 2.00 PM. The performance is representated by the rate changes of mass flow and inlet fluid temperature. The experiment shows that the best performance of this tubular solar collector is at mass flow rate of 250 cc/min with the maximum efficiency of 58.5 %
Potensi Biogas dari Substrat Bio-Limbah Perhotelan I Nyoman Suprapta Winaya; I Gusti Ngurah Putu Tenaya; I Made Agus Putrawan
Jurnal Energi Dan Manufaktur Vol 8 No 1 (2015): April 2015
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Penelitian ini bertujuan untuk mengetahui potensi produksi biogas yang dihasilkan daripemanfaatan bio-limbah perhotelan seperti limbah dapur (kitchen) dan limbah lumpur (sewage)dengan penambahan inokolum kotoran hewan. Jumlah material kering (total solid, TS) darilimbah hotel akan dikaji untuk diketahui pengaruhnya terhadap produksi biogas yang dihasilkan.Penelitian dilakukan secara eksperimen dengan variasi TS sebesar 3, 4, 5 gram ke dalamsebuah biodigester skala laboratorium kapasitas 1000ml. Pengukuran kinerja dari biodigesterdiamati selama 40 hari dan dilakukan pengkondisian pH pada digester kontrol. Pengujiankandungan gas metana dilakukan secara langsung menggunakan metode absorpsi CO2 Brigongas tester. Hasil penelitian menunjukkan bahwa dengan mengkondisikan pH pada rentang 6,8-7,5 merupakan kondisi ideal bagi bakteri metana sehingga mempengaruhi produksi biogas yangdihasilkan. Komposisi 5 gram TS sewage dengan pH dikondisikan menunjukkan volume spesifikbiogas paling tinggi. Sedangkan persentase gas metana yang dihasilkan tidak memiliki korelasilangsung terhadap komposisi material kering dan menunjukkan fenomena yang hampir seragamKata kunci : Limbah perhotelan, inokolum, biogas, total solidThis study aims to determine biogas production using organic waste as raw material from hotelindustries such as kitchen waste and sewage sludge with the addition of inokolum. Total drymatter (total solid, TS) of organic waste is studied to determine its effect on the biogas production.Experiments was conducted with a variation of TS of 3, 4, 5 grams into a biodigester laboratoryscale of 1000ml. Measurement of the performance of the biodigester was observed for 40 daysand the pH condition in the digester was controlled. Methane gas content was done directly usingBrigon CO2 gas tester. The results showed that the conditioned of pH 6.8 to 7.5 are found as theideal conditions for methane bacteria to produce of biogas. Composition of 5 grams TS sewagewith a conditioned pH showed the highest specific volume of biogas production. While thepercentage of methane gas that is produced does not have a direct correlation to the compositionof TS and show the phenomenon that is almost uniformlyKey words: hotel wastes, inoculum, biogas, total solids
Penentuan dimensi perpipaan sistem pompa paralel Anak Agung Adhi Suryawan; Made Suarda; I Gusti Ketut Sukadana
Jurnal Energi Dan Manufaktur Vol 9 No 1 (2016): April 2016
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak:Sistem pompa paralel direncanakan untuk mendapatkan kapasitas pemompaan yang lebih besar, yaitu hasil perkaliandari kapasitas masing-masing pompa dengan jumlah pompa yang beroperasi. Namun pada kenyataannya di lapangan,kapasitas aliran air yang dialirkan oleh sistem paralel tiga unit pompa booster jauh lebih kecil dari tiga kali kapasitasspesifikasi pompanya. Padahal, jika pompa tersebut dioperasikan hanya satu unit menghasilkan kapasitas sesuaidengan spesifikasi pompanya. Hal tersebut disebabkan karena unjuk kerja sistem pompa sangat dipengaruhi olehsistem instalasi perpipaannya. Untuk itu perlu dilakukan pengujian sistem perpipaan pompa booster untukmendapatkan model instalasi perpipaan yang dapat menghasilkan unjuk kerja yang optimal. Penelitian ini dilakukandengan membuat sebuah model yang serupa dengan aslinya namun dimensinyag diperkecil. Pengujian dilakukan padavariasi diameter pipa header dengan sudut tee pada pipa hisap unit pompa 90o (tee-T) dan 45o (tee-Y), danmemvariasikan panjang serta diameter pipa hisap pompa. Hasil penelitian menghasilkan sebuah prosedur disain danformula dimensi perpipaan instalasi pompa paralel yang menghasilkan unjuk kerja pompa yang terbaik.Kata kunci: Sistem pompa pararel, header pipa, T-yee, pipa isap, unjuk kerja pompaAbstrac:tA parallel pump system is planned to get a greater pumping capacity. Total capacity of a parallel pump is the product ofthe capacity of each pump with the number of operating pumps. But in fact on the most applications, for instant, theflow capacity of water delivered by the three unit parallel pump system is much smaller than three times the capacity ofthe pump specifications. In the other hand, if the pump is operated only one unit it generated capacity in accordancewith the pump specifications. This is caused by that the pump system performance is strongly influenced by the pipinginstallation systems. Therefore, It is necessary for testing the piping system of parallel pump to get a parallel pumppiping model that can produce the best performance. The research was done by creating a parallel pump model that issimilar to the original but with smaller dimension. Tests performed on the header pipe diameter variation with angle ofthe tee on the suction and discharge pipe pump is 90? (tee-T) and 45? (tee-Y), and varying the length and diameter ofthe pump suction pipe. The results of the study find a design procedure and formulas in determining dimension ofpipeline parallel pump installations that generates the best pump performance.Keywords: parallel pump system, header pipe, tee-Y, suction pipe, pump performnace
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
A Java GUI for the Design of an Impeller Bramantya M. A.; Zahari Taha; Yasuo Suga
Jurnal Energi Dan Manufaktur Vol 2, No.1 Juni 2007
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Graphical User Interface (GUI) elements are treated as objects. They encapsulate data and method in a simple window. The GUI developed in this paper is to assisting designing and manufacturing an impeller pump. The software is developed in JAVA. Programming in JAVA takes advantages of its flexibilities. Results are presented in 2 D graphics and animation. Cubic Bezier curves algorithm is used to generate the impeller curve. The software is suitable for small industries and educational purposes.
Pengaruh Besar Butiran Biji Jarak dan Arang Sekam Padi pada Briket Dengan Perekat Kanji dan Tanah Liat Terhadap Kadar Air, Nilai Nalor dan Laju Pembakarannya Panca Sunu Pamungkas; I Wayan Joniarta; Made Wijana
Jurnal Energi Dan Manufaktur Vol 7 No 2 (2014): Oktober 2014
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Konversi minyak tanah ke bahan bakar gas (LPG) terus didorong oleh pemerintah, untukefisiensi dan mengurangi subsidi BBM. Dilain pihak pemerintah terus menghimbaumasyarakat untuk memanfaatkan sumber-sumber energi alternatif yang melimpah dan lebihmurah, salah satunya adalah briket. Sekam padi sebagai salah satu bahan untuk membuatbriket telah banyak digunakan oleh masyarakat karena jumlahnya yang begitu banyak danmudah didapat. Begitu juga dengan biji jarak yang akhir-akhir ini banyak digunakan sebagaibahan bakar alternatif yang potensial. Dalam penelitian ini diterapkan metode eksperimenuntuk mengkombinasi besarnya butiran biji jarak menjadi ukuran 4 mesh, 8 mesh dan 12mesh, dengan arang sekam padi. Kedua bahan tersebut dicampur dengan perekat tepungkanji dan tanah liat. Campuran tersebut dicetak menjadi briket kemudian diuji untukmengetahui kadar air, nilai kalor dan laju pembakarannya. Hasil dari penelitian inimenunjukkan bahwa semakin kecil partikel biji jarak maka kadar airnya akan lebih rendah,nilai kalornya akan lebih tinggi dan laju pembakaran lebih rendah. Sedangkan penggunaanperekat tepung kanji menghasilkan kadar air yang lebih rendah, nilai kalor yang lebih tinggidan laju pembakaran lebih tinggi. Kadar air briket berkisar antara 4,805 – 8,219%, nilai kalor2.836,024 – 4.215,949 cal/gram dan laju pembakaran 2,84 – 6,02 gram/menit.Kata kunci: Bahan bakar, briket biji jarak, nilai kalor, kadar airConversion the kerosene to fuel gas (LPG) continues to be driven by the government, toefficiency and reduce fuel subsidies. On the other hand the government continues to urgethe public to take advantage of alternative energy sources are abundant and cheaper, one ofwhich is the briquettes. Husk as one of the ingredients to make the briquettes have beenwidely used by the community because there are so many and easy to obtain. Likewise thecastor bean which lately is widely used as a potential alternative fuel. In this study appliedexperimental method to combine the grain size of castor beans into a size 4 mesh, 8 meshand 12 mesh, with husk. Both materials are mixed with starch glue and clay. The mixture ismolded into briquettes are then tested to determine the water content, calorific value and therate of combustion. Results from this study indicate that the smaller the particles, thedistance seeds will be lower water content, calorific value will be higher and lower firing rate.While the use of adhesive starch resulted in a lower moisture content, higher calorific valueand a higher firing rate. Briquettes moisture content ranges from 4.805 to 8.219%, thecalorific value of 2836.024 to 4215.949 cal/ gram and firing rate from 2.84 to 6.02 grams/minute.Keywords: Fuel, briquettes of castor beans, calorific value, water content

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