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Armansyah Halomoan Tambunan

Departmen Teknik Mesin Dan Biosistem, Institut Pertanian Bogor, Kampus IPB Darmaga, Bogor 16002 Email: Lpmanalu@yahoo.com, Ahtambun@ipb.ac.id

Author-ID : 2649691

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering

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Pendekatan Analitik untuk Menduga Koefisien Pindah Panas Konveksi Ida Bagus Putu Gunadnya; Kamaruddin Abdullah; Armansyah Halomoan Tambunan
Jurnal Keteknikan Pertanian Vol. 22 No. 1 (2008): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Convective heat transfer coefficient has an important role in thermal processes. It is commonly determined and formulated using empirical models, while some workers have also proposed formulas based on analytical methods. This paper describes the formulation of convective heat transfer coefficient using an analytical approach which could be expressed as h = 5.277 V0.5Keywords: convective heat transfer coefficient, analytical approach Diterima: 11 Juni 2007; Disetujui: 24 September 2007

Analisis Dimensional Reaktor Berpengaduk Statis untuk Produksi Biodiesel Akhmad Irfan; Armansyah Halomoan Tambunan; Desrial -
Jurnal Keteknikan Pertanian Vol. 4 No. 2 (2016): JURNAL KETEKNIKAN PERTANIAN
Publisher : PERTETA

AbstractBiodiesel production can be done using static mixing reactor (SMR). The production by this method requires less energy than blade agitator. However, the use of elements in the helix-shaped stirrer reactors causing large pressure drop. The other factors that affect the flow in the SMR can be determined using dimensional analysis. Dimensional analysis can be used to eliminate the variables that are not required so that can be done to optimize the energy used in the SMR design. The variables that influence the pressure drop (ΔP) in the SMR can be formulated into mathematical equation as:Total irreversibility due to the use of a static mixer in the SMR tested is 0.237 W.AbstrakProduksi biodiesel dapat dilakukan dengan menggunakan reaktor berpengaduk statis atau SMR (Static Mixing Reactor). Pembuatan biodiesel dengan metode ini membutuhkan energi yang lebih kecil dibandingkan dengan menggunakan blade agitator. Namun demikian penggunaan elemen pengaduk yang berbentuk helix dalam reaktor menimbulkan pressure drop yang besar. Faktor-faktor lain yang berpengaruh terhadap aliran di dalam SMR dapat ditentukan dengan menggunakan analisis dimensional. Analisis dimensional mampu menghilangkan variabel-variabel yang tidak diperlukan sehingga dapat dilakukan untuk mengoptimalkan energi yang digunakan dalam perancangan SMR. Variabel-variabel yang berpengaruh terhadap pressure drop (ΔP) di dalam SMR yang dapat diformulasikan ke dalam bentuk persamaan matematis sebagai:Ketakmampubalikan total akibat penggunaan elemen berpengaduk statis yang diuji adalah 0,237 W.

Karakterisasi Arang dan Gas-gas Hasil Pirolisis Limbah Kelapa Sawit Muhammad Raju; Armansyah Halomoan Tambunan; Radite Praeko Agus Setiawan
Jurnal Keteknikan Pertanian Vol. 4 No. 2 (2016): JURNAL KETEKNIKAN PERTANIAN
Publisher : PERTETA

AbstractEmpty fruit bunch (EFB) and shell of oil palm are potential sources of bioenergy because they contain lignocellulose (cellulose, hemycellulose and lignin) which can be converted to bio-oil (liquid), char, or combustible gases by pyrolysis process. Operating temperature of the pyrolysis process will influence the composition of the liquid, char and gases, as well as its characteristics. The objective of this study is to characterize the pyrolysis product of both empty fruit bunch and shell as affected by the pyrolysis temperature. The experiment was conducted by using a lab scale pyrolysis reactor, specially designed with controlable temperature. The temperature of the pyrolysis process was controled at 300°C, 400°C, 500°C, and 600°C level, and the product was measured and analysed. The result showed that pyrolysis of shell produced char, liquid and gases at the range of 34.99 - 63.78%, 22.76 - 43.28% and 13.47 - 21.73%, in mass fraction respectively. While pyrolysis of empty fruit bunch produced char, liquid and gases at the range of 30.66 - 64.7%, 16.25 - 29.16% and 18.98 - 44.49%, in mass fraction respectively. Increasing temperature resulted in increasing calorific value of the pyrolysis char from shell and empty fruit bunch in range of 25.64 – 29.60 kJ/g and 24.50 – 27.86 kJ/g, respectively. However, the calorific value of pyrolysis gases was decreasing with the increasing temperature in range of 12.18 kJ/g – 20.05 kJ/g and 11.98 kJ/g – 15.94 kJ/g, respectively. The gas calorific value did not account H2 gas, which might be the cause of the phenomenon. Shell pyrolysis temperature increasing caused the increasing of CO concentration in range 2.86% - 18.42% while the CH4 concentration increased at 400°C level afterwards decreased at higher temperature level in range of 0.89% - 2.84%. The increasing of EFB pyrolysis temperature increased CO dan CH4 concentration in range 3.8% - 15.74% and 0.29% - 0.76%, respectively.AbstrakCangkang dan tandan kosong kelapa sawit (TKKS) merupakan sumber bioenergi yang potensial karena mengandung lignoselulosa (selulosa, hemiselulosa dan lignin) sehingga dapat dikonversi menjadi cairan, arang atau gas mampu bakar melalui proses pirolisis. Suhu pengoperasian pada proses pirolisis akan mempengaruhi komposisi cairan, arang dan gas serta karakteristik hasil pirolisis tersebut. Tujuan dari penelitian ini adalah untuk mengkarakterisasi produk pirolisis cangkang dan tandan kelapa sawit yang dipengaruhi oleh suhu pirolisis. Penelitian dilakukan dengan menggunakan reaktor pirolisis skala lab, yang didesain khusus agar suhunya dapat dikendalikan. Suhu pirolisis dikendalikan pada level 300°C, 400°C, 500°C dan 600°C, kemudian hasil pirolisis diukur dan dianalisa. Hasil penelitian menunjukkan bahwa pirolisis cangkang menghasilkan fraksi massa arang , cairan dan gas dalam rentang 34.99 - 63.78%, 22.76 - 43.28% dan 13.47 - 21.73% secara berturut-turut. Sedangkan pirolisis TKKS menghasilkan fraksi massa arang, cairan dan gas dalam rentang 30.66 – 64.76%, 16.25 – 29.16% dan 18.98 – 44.49% secara berturut-turut. Peningkatan suhu menghasilkan peningkatan nilai kalor arang hasil pirolisis cangkang dan TKKS dengan rentang antara 25.64 – 29.60 kJ/g dan 24.50 – 27.86 kJ/g. Tetapi, nilai kalor gas pirolisis menurun seiring dengan peningkatan suhu pirolisis dengan rentang 12.18 kJ/g – 20.05 kJ/g dan 11.98 kJ/g – 15.94 kJ/g untuk pirolisis cangkang dan TKKS. Nilai kalor gas tidak menghitung gas H2 yang mungkin menyebabkan fenomena tersebut. Peningkatan suhu pirolisis cangkang kelapa sawit mengakibatkan peningkatan konsentrasi gas CO pada rentang 2.8% - 18.42% sementara konsentrasi gas CH4 meningkat pada suhu 400°C namun menurun kembali dengan rentang 0.89% - 2.84%. Peningkatan suhu pirolisis TKKS meningkatkan konsentrasi gas CO dan CH4 pada rentang 3.81% - 15.74% dan 0.29% - 0.76%.

Analisis Alternatif Solusi Penyediaan Sumber Energi Listrik Studi Kasus: Kabupaten Kupang Rusman Sinaga; Armansyah Halomoan Tambunan; Prastowo Prastowo; Bintang Charles Hamonangan Simangunsong
Jurnal Keteknikan Pertanian Vol. 5 No. 3 (2017): JURNAL KETEKNIKAN PERTANIAN
Publisher : PERTETA

AbstractKupang is one of the districts in Indonesia which has low electrification ratio that is about 60%. There are still 32 out of 177 villages having no access to Electrical Energy Sources (EES) supply. It means that there are 30,910 out of 78,011 households without access to electricity supply. The barriers for supplying the electricity were the difficulties to reach the location due to its geographical conditions. This research was aimed to analyze and select the appropriate electrical power system for using the available primary energy resources in the rural area of Kupang district, bounded with three criteria, namely environmentally friendly, efficient, and effective. The results of Analytical Hierarchy Process of the alternative solutions to the provision of EER in Kupang district found that the first option is the solar photovoltaic power system/PLTS (41%), the second option is wind power system/PLTB (27.5%), the third option is microgrid power system/ MG (20.8%) and the fourth is hybrids power system/PLTH (10.8%). AbstrakKupang merupakan salah satu Kabupaten di Indonesia yang memiliki rasio elektrifikasi yang rendah yaitu sekitar 60%. Di Kabupaten Kupang masih terdapat 32 dari 177 desa yang belum mendapatkan pasokan Sumber Energi Listrik (SEL). Hal ini berarti bahwa 30,910 dari 78,011 rumah tangga belum mendapatkan pasokan listrik. Kendala utama pemasokan SEL adalah kondisi georafis yang sulit dijangkau. Tujuan penelitian ini adalah untuk menganalisis dan memilih sistem tenaga listrik untuk penyediaan SEL sesuai dengan sumberdaya energi primer yang dimiliki perdesaan dengan tiga kriteria antara lain ramah lingkungan, efisien dan efektif. Hasil Proses Hirarki Analitik solusi alternatif untuk penyediaan SEL di Kabupaten Kupang ditemukan bahwa pilihan pertama adalah sistem tenaga surya fotovoltaik/PLTS (41%), pilihan kedua adalah sistem tenaga angin/PLTB (27.5%), opsi ketiga adalah sistem microgrid/MG (20.8%) dan yang keempat adalah sistem tenaga hibrida/PLTH (10.8%).

Kajian Efek Medan Elektromagnet terhadap Karakteristik Semburan Bahan Bakar Solar, Biodiesel dan Campuran Keduanya Tatun Hayatun Nufus; Wawan Hermawan; Radite Praeko Agus Setiawan; Armansyah Halomoan Tambunan
Jurnal Keteknikan Pertanian Vol. 6 No. 1 (2018): JURNAL KETEKNIKAN PERTANIAN
Publisher : PERTETA

AbstractResearch on optimization of diesel engine fuel have been conducted, among other, by utilizing the electromagnetic field. To prove that by using the electromagnetic field of the combustion process to be optimal among them is to analyze the character of atomization. The purpose of this research was to analyzethe effect of fuel magnetization on the fuel spray pattern. Experiments were conducted using several fuel including diesel fuel, mixtures of diesel fuel and biodiesel of 10%, 40%, 70%, and biodiesel. Before the spraying test, the fuel was exposed to strong electromagnetic field with variation of wound coil 5000-9000 winding (876-1300 Gauss) for 5 minutes. The spraying test used an injector tester at a pressure of 14.7 Mpa. The spray was observed using a high-speed camera. It was appeared that the larger magnetic field applied to the fuel caused the viscosity to fall in the range of 5-15%, increasing the angle of the sprays or widespread area of the bursts in the range of 3.5-12%, and the particle size of the bursts becomes smaller by 0.2916-0.975 nm. This information is considered to be useful for further research in order to resolutely clarify the phenomenon of efficient combustion process of fuel after exposure to magnetic field.AbstrakBerbagai penelitian tentang pengoptimalisasian bahan bakar motor diesel telah banyak dilakukan, salah satunya dengan memanfaatkan medan elektromagnet. Untuk membuktikan bahwa dengan menggunakan medan elektromagnet proses pembakaran menjadi optimal diantaranya adalah dengan menganalisis karakter semburan bahan bakar. Tujuan penelitian ini adalah menganalisis efek magnetisasi bahan bakar terhadap pola semburan bahan bakar. Bahan bakar yang digunakan adalah solar, B10, B40, B70, dan biodiesel. Bahan bakar yang dicoba diberi paparan kuat medan elektromagnet dengan variasi jumlah lilitan kawat 5000-9000 lilitan 836.45 - 1353 Gauss selama 5 menit (300 detik) dan dilanjutkandengan proses penyemprotan melalui alat injector tester pada tekanan 14.7 Mpa. Hasilnya diamati dengan kamera kecepatan tinggi. Tampak bahwa makin besar medan magnet yang diberikan pada bahan bakarmenyebabkan viskositas turun pada kisaran 5-15%, meningkatkan sudut semburan atau luas daerah semburan menjadi lebih besar berkisar 3.5-12%, dan ukuran partikel semburan menjadi lebih kecil sebesar0.2916-0.975 nm. Informasi ini berguna untuk penelitian lebih lanjut agar secara jelas dapat mengklarifikasi fenomena magnetisasi bahan bakar terhadap proses pembakaran yang efisien.

Tinjauan Perkembangan Proses Katalitik Heterogen dan Non-Katalitik untuk Produksi Biodiesel Wahyudin Wahyudin; Armansyah Halomoan Tambunan; Nanik Purwanti; Joelianingsih Joelianingsih; Hiroshi Nabetani
Jurnal Keteknikan Pertanian Vol. 6 No. 2 (2018): JURNAL KETEKNIKAN PERTANIAN
Publisher : PERTETA

AbstractBiodiesel is still expected to be an alternative fuel other than petroleum. Therefore, intensive research is being done by researchers in the world to develop biodiesel production process that is more efficient, economical and environmentally friendly. Among them is by developing a catalytic and non-catalytic process. The heterogeneous catalytic process is of particular concern with many promising results and is expected to address the current lack of homogeneous catalytic processes. In Indonesia, many natural catalyst sources have been investigated into potential heterogeneous catalyst. The non-catalytic process also provides a reasonably reliable process expectation of course with its various challenges. Both heterogeneous catalytic processes and non-catalytic processes are believed to be potential processes that can be applied in the near future. The development of the results and the challenges of these two processes, therefore, is reviewed in this work as an innovative biodiesel process technology research opportunity.AbstrakBiodiesel masih diharapkan menjadi bahan bakar alternatif selain dari minyak bumi. Oleh karenanya penelitian yang intensif tengah dilakukan para peneliti di dunia untuk mengembangkan proses produksi biodiesel yang lebih efisien, ekonomis dan ramah lingkungan. Diantaranya adalah dengan mengembangkan proses secara katalitik dan non-katalitik. Proses katalitik heterogen menjadi perhatian khusus dengan banyaknya hasil penelitian yang menjanjikan dan diharapkan dapat mengatasi kekurangan proses katalitik homogen saat ini. Di Indonesia berbagai sumber katalis alami telah diteliti untuk dijadikan katalis heterogen. Namun, proses non-katalitik juga memberikan harapan proses yang cukup bisa diandalkan tentu dengan berbagai tantangannya. Baik proses katalitik heterogen maupun proses non-katalitik diyakini sebagai proses potensial yang dapat diterapkan dalam waktu dekat ini. Oleh karena itu, perkembangan hasil dan berbagai tantangan dari kedua proses tersebut diulas dalam tinjauan ini sebagai peluang penelitian teknologi proses biodiesel yang inovatif.

Analisis Rasio Energi pada Produksi Biodiesel dengan Reaktor Berpengaduk Statik Sistem Kontinu (Energy Ratio Analysis on Biodiesel Production Using Continuous Static Mixing Reactor) Inge Scorpi Tulliza; Armansyah Halomoan Tambunan; Edy Hartulistiyoso; Dadan Kusdiana
Jurnal Keteknikan Pertanian Vol. 8 No. 2 (2020): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.08.2.39-44

Energy ratio analysis of various methods and technology of biodiesel production is needed to get an idea of the effectiveness of the method or technology used. This study aims to analyze the energy ratio in the biodiesel production process with a continuous static mixing reactor. RE2 values for biodiesel production using a continuous static mixing reactor with catalysts 0.3% (w/w) and 0.5% (w/w), respectively are 0.94 and 1.03. The addition of the number of modules to achieve the conversion rate required in accordance with SNI-7182 (2018) can increase the energy ratio to 1.10 in the use of catalysts 0.3% (w/w), and 1.09 with the use of a 0.5% catalyst (w/w). The energy ratio value with the addition of the module is about 10% higher than the ratio value for the bacth method using a 1% catalyst and the SMV method without catalyst.

Kinetika Pengeringan Lapisan Tipis Daun Jati Belanda (Thin Layer Drying Kinetics of Guazuma Ulmifolia Leaves) Hendri Syah; Armansyah Halomoan Tambunan; Edy Hartulistiyoso; Lamhot Parulian Manalu
Jurnal Keteknikan Pertanian Vol. 8 No. 2 (2020): Jurnal Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.08.2.53-62

The objectives of this study were to determine a suitable thin layer drying model to describe the drying kinetics of Guazuma ulmifolia leaves and determine the mass transfer parameters of Guazuma ulmifolia leaves. The drying of Guazuma ulmifolia leaves was conducted in a laboratory scale dryer with various temperature (40oC, 50oC, and 60oC) and relative humidity (30%, 40%, 50% and 60%). Five drying models, namely, Newton, Henderson and Pabis, Page, Midilli-Kucuk, and Verma et al. were fitted to the drying data. The drying curve of guazuma leaves did not show a constant drying period during the drying period. The models suitability were compared base on coefficient of determination (R2), root square mean errors (RSME), and reduced mean square of deviation (X2). It was found that, among the models evaluated, the Midilli and Kucuk model is the best to describe the drying kinetics of Guazuma ulmifolia leaves. The effective moisture diffusivity was found to be in the range of 10-13 – 10-12 m2/s and the convective mass transfer coefficient was in the range of 10-9 – 10-10 m/s. The activation energy value was found to be 89.21 kJ/mol.

Statistical Analysis of Effect of pH Treatment on Biohydrogen Production from POME Waste Junita Tarigan; Armansyah Halomoan Tambunan; Radite Praeko Agus Setiawan; Obie Farobie; Furqon
Jurnal Keteknikan Pertanian Vol. 10 No. 3 (2022): Desember 2022
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.010.3.319-327

Palm Oil Mill Effluent (POME) has the potency to be converted to biohydrogen by dark fermentation. The statistical approach was used to determine the relationship between pH and biohydrogen production. This study aims to investigate the effect of pH on biohydrogen production with a statistical approach. Three substrates were treated with neutral pH and three without pH treatment. This experiment used the trapezoidal numerical integration method to get the total production of H2 produced per measurement time interval. There are nine substrate combinations tested. Three tests concluded that there was no difference in hydrogen production due to the pH treatment, and the sixth test concluded that there was a difference in hydrogen production due to the influence of pH. The tendency of every substrate to influence biohydrogen production without pH treatment and with pH treatment is a polynomial degree 3.

Co-Authors . Furqon Abdul Baits Dehana Padma Swastika Arief Sabdo Yuwono Bintang C. H. Simangunsong Bintang Sipartogi Panjaitan Dadan Kusdiana Desrial Dwi Setiawan Edy Hartulistiyoso Ema Hastarini Erliza Noor Ferdy Christian Hartanto Frances Roi Seston Tampubolon Furqon Hablinur Alkindi Hendri Syah Hiroshi Nabetani Hiroshi Nabetani Ida Bagus Putu Gunadnya Inge Scorpi Tulliza Irfan, Akhmad Joelianingsih . Johanis Rumengan Pangala Joni Joni Joni Junita Tarigan Kamaruddin Abdullah Kiman Siregar Kiman Siregar, Kiman Lamhot Parulian Manalu Lamhot Parulian Manalu Linda Lestari Marpaung, Johana Mohammad Sahid Indrawan Nadia Nurul Atikah Nanik Purwanti Obie Farobie Panjaitan, Bintang Sipartogi Prastowo Prastowo Radite Praeko Agus Setiawan Raju, Muhammad Rodiah Nurbaya Sari, Rodiah Nurbaya Rusman Sinaga Salundik Sebayang, Renaldi Setya Permana Sutisna Sutoyo, Edi Tatun Hayatun Nufus Tetsuya Araki Wahyudin Wahyudin Wawan Hermawan Widyajatmiko, Athanatius Henang Wicaksono

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