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All Journal JURNAL SAINS DAN TEKNOLOGI INDONESIA Jurnal Keteknikan Pertanian Jurnal Teknologi Pertanian Jurnal Dinamika Penelitian Industri Jurnal Teknologi Energi

Lamhot P. Manalu

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Author-ID : 313604

Agriculture, Biological Sciences & Forestry Computer Science & IT Education Energy Industrial & Manufacturing Engineering

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PENENTUAN SIFAT TERMOFISIK MAHKOTA DEWA (THERMAL PROPERTIES OF Phaleria macrocarpha) Manalu, Lamhot P.
Jurnal Sains dan Teknologi Indonesia Vol. 13 No. 3 (2011)
Publisher : Badan Pengkajian dan Penerapan Teknologi

of information on their thermal properties. Although a lot of experimental data can be found, the variety of products and the differences in measurement method make limitation on the value of the available data, especially for Indonesia’s products. These data are needed to get information about temperature change when a product was processed by heating or cooling. The data are important for optimizing the efficiency of energy used in the process. The objective of this study is to determine thermal diffusivity and conductivity of mahkota dewa or crown of god (Phaleria macrocarpha). The values were determined numerically with indirect methods. The result shows that thermal conductivity of mahkota dewa is 0.1359 W/moC, while its thermal diffusivity is 4.11x10-8 m2/s.

Aplikasi Kontrol Digital Untuk Pemupukan Secara Variable Rate Pada Sistem Pertanian Presisi Manalu, Lamhot P.
Jurnal Sains dan Teknologi Indonesia Vol. 15 No. 3 (2013)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Precision agriculture has many facets including guidance, yield mapping, variable rate application and remote sensing. Variable rate nitrogen fertilization is a technique being developed for fertilizer application in recent years. One of the main problems in variable rate nitrogen fertilization is controlling the fertilizer application rate according to the soil nitrate level. In this paper, a digital control system for variable rate nitrogen fertilization is presented. A pole-placement controller design based on the simplified process model is used in this system. The system dynamic response of the pole-placement controller was simulated under the condition with torque disturbance and the condition without torque disturbance. The digital controller was then implemented into a prototype system and the dynamic response of the control system was tested under different torque disturbance conditions. The control system performed at acceptable levels under small external torque disturbance conditions. However, under large torque disturbances, the steady-state offset error in the system response was not acceptable and the use of a robust controller for both tracking control and disturbance rejection was recommended. This paper presents a simulation of the use of digital control for variable rate fertilization The benefits of using variable rate technology are very clear. Low yielding areas of the field are no longer over fertilized resulting in reduction of costs in those areas.Pertanian presisi memiliki banyak aspek diantaranya pengukuran, pemetaan hasil, aplikasi laju tidak tetap dan penginderaan jarak jauh. Pemupukan nitrogen secara laju tidak tetap (variable rate) adalah teknik yang dikembangkan untuk aplikasi pemupukan dalam beberapa tahun terakhir. Salah satu masalah utama dalam pemupukan nitrogen secara laju tidak tetap yaitu mengontrol jumlah pemakaian pupuk agar sesuai dengan kandungan nitrat tanah. Tulisan ini menyajikan studi tentang aplikasi sistem kontrol digital untuk pemupukan nitrogen secara laju tidak tetap dalam kerangka pertanian presisi (precision farming). Sebuah desain kontroler tiang-penempatan didasarkan penyederhanaan modelnya digunakan dalam sistem ini. Sistem respon dinamik dari pengontrol tiang-penempatan disimulasikan pada kondisi dengan gangguan torsi dan kondisi tanpa gangguan torsi. Kontrol digital kemudian diimplementasikan ke dalam sistem prototipe dan respon dinamik dari sistem kontrol diuji di bawah kondisi gangguan torsi yang berbeda. Sistem kontrol dilakukan pada tingkat yang dapat diterima dalam kondisi gangguan torsi eksternal yang kecil. Namun, di bawah gangguan torsi besar, kondisiÃ‚Â steadyÃ‚Â yang mengimbangi kesalahan dalam respon sistem tidak dapat diterima. Tulisan ini menyajikan simulasi penggunaan kontrol digital untuk pemupukan secaraÃ‚Â variable rate. Tujuan penggunaan teknologiÃ‚Â variable rateÃ‚Â adalah agar lokasi dengan produktivitas rendah tidak lagi dipupuk secara berlebihan sehingga mengurangi biaya.Keywords: fertilization, digital control, variable rate, precision farming.

Konsumsi Energi Pada Alat Pengering Surya dan Tipe Bak Untuk Pengeringan Biji Kakao Manalu, Lamhot P.
Jurnal Sains dan Teknologi Indonesia Vol. 17 No. 3 (2015)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Crop drying is essential for preservation in agricultural applications. It is performed either using fossil fuels in an artificial mechanical drying process or by placing the crop under the open sun. The first method is costly and has a negative impact on the environment, while the second method is totally dependent on the weather. The drying process requires a lot of energy in relation to the amount of water that must be evaporated from the product. It is estimated that 12% of the total energy used by the food industries and agriculture absorbed in this process. Due to the limitation of energy resources, it is important to keep researching and developing of diversification and optimization of energy This study aims to assess the use of energy for cocoa drying using solar energy dryer and bin-type dryer, as well as to determine the drying efficiency of each type of dryer. The results showed that the efficiency of the solar dryer drying system ranges between 36% to 46%, while the tub-type dryers between 21.7% to 33.1%. The specific energy of solar dryer ranged from 6.17-7.87 MJ / kg, while the tub-type dryers 8.58-13.63 MJ / kg. Dryer efficiency is influenced by the level of solar irradiation and the amount of drying load, the higher the irradiation received and more cocoa beans are dried, the drying efficiency is also higher and the specific energy further down.Proses pengeringan memerlukan banyak energi sehubungan dengan banyaknya air yang harus diuapkan dari bahan yang dikeringkan. Pengeringan dapat dilakukan dengan menggunakan pengering mekanis berbahan bakar fosil atau dengan menempatkan produk di bawah matahari terbuka. Metode pertama adalah mahal dan memiliki dampak negatif pada lingkungan, sedangkan metode kedua sangat tergantung pada cuaca. Diperkirakan bahwa 12% dari total energi yang dipergunakan oleh industri pangan dan pertanian diserap untuk proses ini. Mengingat semakin terbatasnya sumber energi bahan bakar minyak maka usaha diversifikasi dan optimasi energi untuk pengeringan perlu terus diteliti dan dikembangkan. Salah satunya adalah pemanfaatan energi surya sebagai sumber energi terbarukan. Penelitian ini bertujuan untuk mengkaji penggunaan energi untuk pengeringan kakao dengan memakai pengering energi surya dan pengering tipe bak, serta untuk mengetahui efisiensi pengeringan dari masing-masing tipe pengering. Hasil kajian menunjukkan bahwa efisiensi total sistem pengeringan alat pengering surya berkisar antara 36% dan 46%, sedangkan pengering tipe bak antara 21.7% dan 33.1%. Kebutuhan energi spesifik alat pengering surya berkisar antara 6.17-7.87 MJ/kg, sedangkan alat pengering tipe bak 8.58-13.63 MJ/kg. Efisiensi alat pengering dipengaruhi oleh tingkat iradiasi surya dan jumlah beban pengeringan, semakin tinggi iradiasi yang diterima pengering serta semakin banyak biji kakao yang dikeringkan, maka efisiensi pengeringan juga semakin tinggi dan kebutuhan energi spesifik semakin turun.Keywords:Ã‚Â energy, efficiency, cocoa, solar dryer, bin-type dryer.

MENGHITUNG KEBUTUHAN PENGERING GABAH DI KECAMATAN CIOMAS BOGOR DENGAN METODE MONTE CARLO Manalu, Lamhot P.
Jurnal Sains dan Teknologi Indonesia Vol. 11 No. 3 (2009)
Publisher : Badan Pengkajian dan Penerapan Teknologi

Sun drying is the traditional method for drying and still preferred in Asia because cheap compared to mechanical drying. Since it uses the sun as heat source it is friendly to the environment, many farmers, grain collectors, traders and millersoften dry their paddy on pavements that specifically constructed for drying. Sundrying pavements have the advantages of high capacity and thus economics of scale, but the weakness is very dependent on the weather. The amount of paddy that can be dried with a drying depends on the number of sunny days, so it is important to know the probabilities of rainy day based on the historical climate data in a region. From these, simulations can be done to calculate how many dryer machines should be provided to overcome the lack of drying capacity. This methodis known as Monte Carlo. This paper presents a study to determine the amount mechanical dryer needed based on the failure probability of sun drying pavements using monte carlo simulation methods in the District of Ciomas, Bogor.The study results based on 10 years daily rainfall data the probability of rainy days in March (0.62) was greater than in September (0,37), so that the total capacity of dryer machine to be prepared is 110 tons/ day. That was equal to 11 units dryerswith 10 tons / unit in capacity.

Co-Authors Agus R. Hoetman Amos ., Amos Armansyah H. Tambunan Armansyah H. Tambunan Cakranegara, Pandu Adi Jamhari Jamhari Jusuf Jakfar, Jusuf Leopold O. Nelwan Leopold O. Nelwan Tri Yogo Wibowo

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