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All Journal ROTOR: JURNAL ILMIAH TEKNIK MESIN Jurnal Matematika UNAND Biomedical and Mechanical Engineering Journal Prosiding SNPBS (Seminar Nasional Pendidikan Biologi dan Saintek)
Widya Wijayanti
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Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Transportation

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PERUBAHAN MASSA DAN NILAI KALOR CHAR DENGAN VARIASI HEATING RATE DAN TEMPERATUR PADA PIROLISIS SERBUK KAYU MAHONI (SWITENIA MACROPHYLLA) Farid Majedi; Widya Wijayanti; Nurkholis Hamidi
ROTOR Vol 9 No 2 (2016)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

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Abstract

Product pyrolysis process is char, tar and gas. Char important parameters are the mass and caloric value. Therefore, this study discusses the effect of temperature and heating rate due the mass and low heating value. Variations heating rate used was 673 K / h and 1073 K / h.Temperature heatingis varied 523 K, 623 K, 723 K, 773 K and 873 K for each heating rate .The heating temperature is provide by eletric heater with control system (arduino uno system). The measurement is donefor biomass and char mass using measuring cup and measured using mass scale. Bomb calorimeter is used to measure teh low heating value Sawdust mahogany dried powder with temperatures 383-398 K. Sawdust mahogany dry pyrolysis with variations planned. The heating process pyrolysis is taken for 180 minutes using stopwatch.The result show that theheating rate and temperatur has effect due mass char product.The results show that char mass tend to decrease due to heating rate and temperature increasing.. Low heating value tend to increase due to heating rate and temperature increasing. Keywords: Pyrolysis, sawdust mahogany, heating rate, temperature, mass,low heating value
PENGARUH VARIASI TEMPERATUR TERHADAP MASSA DAN ENERGI YANG DIHASILKAN PIROLISIS SERBUK KAYU MAHONI (SWITENIA MACROPHYLLA) PADA ROTARY KILN Ikhwanul Qiram; Denny Widhiyanuriyawan; widya wijayanti
ROTOR Vol 8 No 2 (2015)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

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Abstract

Pirolysis is thermochemical decomposition process of biomass into useful product. A method that can be used is a rotary kiln pirolyzer which consist a heating cylinder that rotate with a certain rotation speed. This research is aimed to get the effet of temperature due to char product quantity of switenia macrophylla rotary kiln pirolysis.The research is done by pirolysis experiment with 200 gram of switenia macrophylla in dust form. Temperature heating is varied 250 C, 350 C, 450 C, 500 C, dan 600 C. The heating temperature is provide by eletric heater with control system. Temperatur is measured with K type thermocouple. The heating process is taken for 180 minutes using stopwatch. The measurement is done for biomass and char volume using measuring cup. Mass is measured using scale. Low heating value is measured using bomb calorimeter.The result show that temperatur has effect due to char product of switenia macrophylla rotary kiln pirolysis. Char mass loss tend to increase due to temperature increasing. Low heating value and char porosity tend to increase due to mass loss percentage increasing. Shrinking factor and percentage of yield energy tend to decrease due to mass loss percentage increasing. Keywords: pirolysis, rotary kiln, char, temperature
PENGGUNAAN METODE FUZZY C-MEANS UNTUK PENGELOMPOKAN PROVINSI DI INDONESIA BERDASARKAN INDIKATOR KESEHATAN LINGKUNGAN WIDYA WIJAYANTI; IZZATI RAHMI HG; FERRA YANUAR
Jurnal Matematika UNAND Vol 10, No 1 (2021)
Publisher : Jurusan Matematika FMIPA Universitas Andalas Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jmu.10.1.129-136.2021

Abstract

Analisis Klaster (cluster analisis) memiliki tujuan untuk mengelompokkan objek-objek berdasarkan karakteristik yang dimiliki. Pengelompokan dengan analisis klaster dibagi menjadi dua metode yaitu metode berhirarki dan metode tak berhirarki. Salah satu metode tak berhirarki adalah Metode Fuzzy C-Means. Metode Fuzzy C-Means merupakan suatu metode yang mempertimbangkan derajat keanggotaan dan himpunan fuzzy sebagai dasar pembobotan. Untuk jumlah klaster optimum didapatkan dengan menggunakan kriteria indeks validitas Partition Entropy Index (PE). Pada penelitian ini Metode Fuzzy C-Means digunakan untuk mengelompokan provinsi-provinsi yang ada di Indonesia berdasarkan indikator kesehatan lingkungan. Indikator kesehatan lingkungan yang digunakan adalah STBM, tatanan kawasan sehat, air minum layak rumah tangga, TTU yang memenuhi syarat kesehatan, TPM yang memenuhi syarat kesehatan, sanitasi layak rumah tangga dan rumah tangga layak huni. Jumlah klaster optimum diperoleh sebanyak 2 klaster yang memiliki nilai partition entropy 0,4633829. Klaster 1 terdiri dari 22 provinsi dan klaster 2 terdiri dari 12 provinsi.Kata Kunci: Fuzzy C-Means, Indikator Kesehatan Lingkungan, Partition Entropy Index
Pemanfaatan sifat Wettability Minyak Nabati untuk meningkatkan Cleanability pada kasus Fouling Muhammad Akhlis Rizza; I Nyoman Gede Wardana; Nurkholis Hamidi; Widya Wijayanti
Prosiding SNPBS (Seminar Nasional Pendidikan Biologi dan Saintek) 2017: Prosiding SNPBS (Seminar Nasional Pendidikan Biologi dan Saintek)
Publisher : Universitas Muhammadiyah Surakarta

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Abstract

Fouling menjadi permsalahan pada proses produksi di suatu industri, terutama industri yang memiliki prosesperpindahan panas. Fouling dapat mengurangi perpindahan panas yang terjadi. Oleh karena itu terjadinyafouling harus diatasi dengan cleaning yang cepat. Untuk mempercepat proses cleaning, terutama pada foulingdengan material droplet minyak nabati dapat dilakukan dengan memanfaatkan sifat wettability. Sifatwettability dapat diatur dengan mengatur temperatur pada droplet. Tujuan analisis ini adalah mengetahuifaktor-faktor yang berpengaruh pada wettability, sehingga dapat dipakai untuk memudahkan proses cleaning. Berdasarkan analisis, diperoleh kesimpulan bahwa wettability dipengaruhi oleh temperatur minyak nabatiserta kerataan permukaan substrate-nya.
Non-Premixed Combustion Simulation with Variation of Swirl Burner Slope using Turbulence Modeling K-ɛ Radissa Dzaky Issafira; Widya Wijayanti; Luluk Edahwati; Wahyu Dwi Lestari Edahwati; Wiliandi Saputro; Ahmad Khairul Faizin; Ndaru Adyono; Tria Puspa Sari
BIOMEJ Vol. 1 No. 2 (2021): BIOMEJ
Publisher : UPN 'Veteran" Jawa Timur

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Abstract

Combustion is a very complex matter. Therefore, we need to know the phenomenon that occur in combustion apart from the temperature distribution. This research uses quasi-research. The background in using quasi-experimental is because it has advantages in data collection. Moreover, the phenomena that occur in more detailed research by means of a numerical approach could also be observed. This research was conducted with an approach (simulation) of diffusion combustion using methane (CH4) fuel and air containing 29% oxygen (O2), 71% nitrogen (N2) and the addition of swirl in the air ducts. k-ɛ turbulence modeling was aaplied in this somulation. This variation of the fuel velocities are 3 m/s, 5 m/s, 7 m/s, where the air velocity was varied for 3 m/s, 5 m/s, 7m/s. In this simulation, room pressure of 1 atm was applied for the surrounding. The results showed that, the greater the angle of inclination of the swirl burner, the shorter the flame. And on the variation of fuel velocity, we get the result that the higher fuel velocity, increase fire height; however, the temperature of the fire height will decrease.
Co-Authors Ahmad Khairul Faizin Akhlis Rizza, Muhammad Denny Widhiyanuriyawan Farid Majedi I Nyoman Gede Wardana Ikhwanul Qiram Luluk edahwati Ndaru Adyono Nurkholis Hamidi Radissa Dzaky Issafira Tria Puspa Sari Wahyu Dwi Lestari Edahwati Wiliandi Saputro Yanuar, Ferra