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INDONESIA
Jurnal Teknologi Energi
Published by Badan Pengkajian dan Penerapan Teknologi
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Computer Science & IT Energy
Arjuna Subject : -
Articles 126 Documents
 9   10   11   12   13 
RISK ANALYSIS FOR THE INFRASTRUCTURE OF A HYDROGEN ECONOMY Rosyid, O A
185P -3466
Publisher : Agency for the Assessment and Application of Technology

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Abstract

Increasing scarcity of fossil fuels makes the deployment of hydrogen in combination with renewable energy sources or the utilization of electricity from full time operation of existing power stations an interesting alternative. A pre-requisite is, however, the safety of the required infrastructure is investigated and its design is evaluated with the associated risk to know, at least, the risks are not higher than that of existing supplies. Therefore, a risk analysis considering its most important objects such as storage tanks, filling stations, vehicles as well as heating and electricity supplies for residential buildings was carried out. The last is considered as representative of the entire infrastructure. The risk analysis is based on fault and event tree analyses, wherever required, and consequence calculations using the PHAST code. The procedure for evaluating the risk and corresponding results will be presented taking one of the objects as an example.
IN-SITU CO2 CURRENT EFFICIENCY MEASUREMENT OF DIRECT ETHANOL FUEL CELL hariyanto, hariyanto
185P -3466
Publisher : Agency for the Assessment and Application of Technology

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Abstract

In this present work, we carry out systematically study on catalyst for ethanol electrooxidation in direct ethanol fuel cell. For cathode catalyst we use a commercial catalyst of 40% Pt/C from ETEK. Catalysts were printed on to carbon paper of TGPH 060 and sandwiched into membrane electrode assembly (MEA) and then arranged in fuel cell with the geometric area 1.2 cm2. As an electrolyte, we used Nafion 117 from Du Pont. On-line Differential Electrochemical Mass Spectrometry (DEMS) measurement in fuel cell setup was carried out in order to determine the activity and selectivity which was indicated by result of Faradaic current and CO2 current efficiency of ethanol electro-oxidation respectively. PtRhCeO2/C was significantly improve the selectivity to form of CO2 in comparison to the commercial catalyst of 20% Pt/C from Alfa Aesar- Johnson Mattews . Increasing of selectivity is shown by increase of CO2 current efficiency of ethanol oxidation of about 25 percent in comparison to references catalyst of 20% Pt/C Alfa Aesar-JM
COMPARING A WAY TO CALCULATE THE HEAT LOSS COEFFICIENT OF SOLAR FLAT PLATE COLLECTOR suharta, herliyani; M. Sayigh, A.; Nasser, S.H.
185P -3466
Publisher : Agency for the Assessment and Application of Technology

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Abstract

The need for a simple solution to derive the total heat loss coefficient, UL , is unquestioned as this reduces time to compute the performance of investigated system, especially in atmosphere when practicality is highly needed. This paper describes a simulation and comparison of several ways to obtained UL The assumptions used and the method are described briefly. The analysis of the result shows that the derived equation (10) applied for solar box cooker type HS is the simplest. The long field test has proved its simplicity and people can understand it easily in practice. This numerical experiment is provided for the readers to validate this simple equation as it can be a tool for the scientist who needs to transfer their knowledge to a wider education level in the context to popularize the application of renewable energy.
FUTURE PROSPECT OF CDM SOLAR COOKER PROJECT ACEH 1, INDONESIA suharta, herliyani
185P -3466
Publisher : Agency for the Assessment and Application of Technology

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Abstract

Firewood in almost all rural areas uses firewood for cooking. Smoke exposure from firewood seriously affects the children's growth and the health of women, increasing woman burden and poverty. Its greenhouse gas (GHG) emissions contribute to global climate change. This is one of the greatest challenges of humanity. The CDM (Clean Development Mechanism) Solar Cooker Project in Sabang Islands and Badar city in South East Aceh was arranged to lay down a better energy path scenario for the future. Solar concentrator cookers "K14" and heat retaining containers named "Wonder box" will be transferred to the people. This project avoids 3.5 tonnes CO2 emissions per year per K14 and applies for a renewable crediting CER (carbon emission reduction) for 7 years period. The CER verification is described. Some views as a societal research finding within the CDM Solar Cooker Project Aceh 1 are described briefly.
PERFORMANCE OF SILICON SOLAR CELL WITH VARIOUS SURFACE TEXTURES Jahanshah, F; Sopian, K; Ahmad, I.; Othman, M.Y; Zaidi, S.H
185P -3466
Publisher : Agency for the Assessment and Application of Technology

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Abstract

The performance of solar cell with various surface texture patterns was reported. Wet, RIE, one and two dimensions texturing with and without the nitride antireflection coating were compared. An I-V tester calibrated by Sandia National Laboratory was used. The surface texture of the solar cells were as follows (a) solar cell with 2D texturing without nitride antireflection, (b) solar cell with 1D texturing with nitride antireflection (c) solar cell with 1D texturing without nitride antireflection, (d) solar cell with wet texturing without nitride antireflection, (e) solar cell with wet texturing with nitride antireflection (f) solar cell with RIE texturing with nitride antireflection. RIE and two dimension surface texturing showed the best output with maximum short density current of 0.042 mA/cm2 and of 0.045 mA/cm2 respectively.
WIND FARM DESIGN FOR OELBUBUK IN EAST NUSA TENGGARA, INDONESIA suharta, herliyani; pakpahan, sahat; Martosaputro, Soeripno
185P -3466
Publisher : Agency for the Assessment and Application of Technology

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Abstract

Electrification ratio of NTT is 28.7 % in 2008. Technical and economical assessments to investigate the possibilities to implement wind farm in East Nusa Tenggara (NTT) province is directed to contribute in the effort to raise the electricity ratio in this province. Some areas are having yearly average wind speed greater than 5 m/sec and the wind power density greater than 300 Watt/m2 . Wind farm is proposed to reduce local dependency to Diesel Power Plant (DPP) and to exerting an effort to reduce CO2 emission. The result of survey, Wind Energy Conversion (WEC) selection and simulation to get wind farmconfiguration for Oelbubuk, in South Central Timor (TTS) Regency in NTT is described. The evaluation of three different WEC having capacity greater than 250kW per unit and its formation are described. The assessment of electricity facilities of DPP in SOE city, its load profile in 2008 and the possible of interconnection to wind farm are described.
UTILIZATION OF WIND ENERGY CONVERSION SYSTEM IN INDONESIA Saputro, Soeripno Marto
185P -3466
Publisher : Agency for the Assessment and Application of Technology

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Abstract

Wind energy is one of the alternative resources that has been developed in Indonesia to support the National Renewable Energy Program. Many areas in Indonesia, have annual wind speed between 2.5 to 5 meter per second. It is enough to support the rural electrification program by applying a small WECS for home lighting, battery charging, cold storage, telecommunication etc.Certain areas in East Nusa Tenggara, West Nusa Tenggara, South Sulawesi and southern part of Java have annual wind speed more than 5 m/s. This gives a possibility to implement a medium to a large size WECS for electric generation. Various WECS of up to 10 kW have been developed. Field test on several villages are progressing. This paper also describes a prospect of WECS utilization, benefit and a possible barrier of WECS implementation and recommendation.
PENYINGKATAN WAKTU PENYALAAN KOMPOR BRIKET BATUBARA supramono, dijan
185P -3466
Publisher : Agency for the Assessment and Application of Technology

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Abstract

Penelitian pembakaran briket batubara untuk mempersingkat waktu penyalaan telah dilakukan dengan memanfaatkan briket promotor bentuk bola yang mengandung oksigenat etil asetat sebanyak 15% berat briket yang berfungsi sebagai penyedia oksigen secara internal dalam material briket karena ketidakcukupan oksigen saat briket promotor mengalami devolatalisasi (fungsi kinetika kimia) dan sebagai penguat terjadinya perpindahan panas konveksi dari bara api pada briket promotor ke briket pemasakan yang diletakkan di sekitarnya karena menambahkan cekukan (dimples) pada permukaan briket promotor berbentuk bola (fungsi perpindahan panas). Penelitian dilakukan dengan menempatkan briket promotor di lapis pertama (atas) di atas dua lapis briket pemasakan dalam kompor briket. Penelitian ini bertujuan meneliti efek penambahan, loading dan bentuk briket promotor (bentuk bola, bola dengan dimples) terhadap waktu penyalaan. Penelitian ini menggunakan udara dengan kecepatan superfisial yang diukur pada kondisi dingin sebesar 1,1 m/s. Penelitian juga dilakukan dengan menempatkan briket promotor berbentuk bola dengan dimples di lapis kedua dengan loading 25% dari 3 lapis briket yang digunakan dengan lapis pertama, sisa lapis kedua dan lapis ketiga diisi briket pemasakan. Parameter kecepatan superfisial udara yang diukur pada kondisi dingin divariasikan pada harga-harga 0,6, 1,2 dan 1,8 m/s untuk melihat pengaruhnya terhadap waktu penyalaan. Hasil penelitian menunjukkan bahwa adanya briket promotor mempercepat waktu penyalaan briket pemasakan hingga 35 menit. Semakin besar loading briket promotor dalam kompor, waktu penyalaannya akan semakin cepat pula. Untuk loading 100%, 75%, 50% dan 25% waktu penyalaan masing-masing adalah 18, 22, 23 dan 25 menit. Dalam hal efek bentuk briket promotor, bentuk bola dengan dimples memiliki waktu penyalaan lebih cepat daripada bentuk bola dengan waktu penyalaan masing-masing 11 menit dan 18 menit. Jadi, waktu penyalaan semakin singkat dengan loading briket promotor semakin besar dan dengan menggunakan briket promotor berbentuk bola dengan cekukan daripada tanpa cekukan. Hasil penelitian dengan menempatkan briket promotor berbentuk bola dengan dimples menunjukkan bahwa waktu penyalaan pada kompor dengan kecepatan superfisial udara 0,6 dan 1,2 m/s hampir sama sebesar 8 menit, sedang dengan kecepatan superfisial 1,8 m/s sebesar 13 menit. Variasi kecepatan superfisial memberi 2 efek yang berlawanan yang bekerja bersamaan terhadap perpindahan panas konveksi yaitu efek turbulensi dan efek quenching. Efek turbulensi mempercepat penyalaan, sedang efek quenching memperlambat penyalaan. Diperkirakan bahwa kecepatan superfisial 1,8 m/s memberi efek quenching lebih besar dibanding efek turbulensi sehingga waktu penyalaan lebih lama.
PENGEMBANGAN RANCANGAN SISTEM PENGOLAHAN BIJI JARAK PAGAR DAN TEKNOLOGI PEMANFAATAN MINYAK JARAK heruhadi, bambang; Sumarsono, M.
185P -3466
Publisher : Agency for the Assessment and Application of Technology

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Abstract

Kegiatan penelitian dan pengembangan sistem pengolahan minyak jarak pagar menjadi bahan bakar alternatif pengganti BBM telah dilaksanakan secara intensif di Balai Besar Teknologi Energi (B2TE). Makalah ini menampilkan kegiatan penelitian dan pengembangan suatu mesin pengolah minyak jarak berkapasitas 40 kg/jam yang bisa dengan mudah dipindah-pindahkan, kompor MPS, arang briket limbah jarak pagar, kompor biomassa PORMASA. Hasil pengujian yang telah dicapai juga ditampilkan.
TINJAUAN KEEKONOMIAN PENETAPAN HARGA BIJI JARAK PAGAR DAN EVALUASI NON-EDIBILITY PROGRAM JARAK PAGAR NASIONAL Martono, R. Wisnu Ali
185P -3466
Publisher : Agency for the Assessment and Application of Technology

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Abstract

Menurut Timnas Bahan Bakar Nabati (BBN), program jarak pagar (jatropha curcas L) diperkirakan mampu mengentaskan kemiskinan dan mengurangi pengangguran sejumlah besar penduduk Indonesia. Selain itu, dengan harga biji kering yang relatif murah, sekitar Rp.500/kg, diperkirakan akan dapat diproduksi BBN yang harganya lebih murah dari minyak solar. Jarak pagar juga dianggap lebih baik sebagai bahan baku BBN karena tidak dapat dikonsumsi oleh manusia (non-edible). Makalah ini meninjau aspek keekonomian kebijakan harga biji jarak pagar, serta sifat non-edible minyak jarak.

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