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"One of the current issues in Indonesia is the scarcity of fossil fuel availability in such a way that the alternative renewable energy sources need to be explored....."

"Kebutuhan energi terus meningkat mengikuti pertumbuhan ekonomi, penduduk, harga energi, dan kebijakan pemerintah. Biomassa memiliki potensi untuk menjadi salah satu sumber energi utama dimasa mendatang, dan modernisasi sistem bioenergi disarankan sebagai kontributor penting bagi pengembangan energi berkelanjutan dimasa depan, khususnya bagi pembangunan berkelanjutan di negara-negara industri maupun di negara-negara berkembang. Kayu di Indonesia merupakan biomassa yang sudah lama dikenal oleh masyarakat dan merupakan sumber energi terbarukan. Untuk mempermudah penggunaan biomasssa kayu sebagai sumber energi atau bahan bakar adalah dengan mengolahnya dalam bentuk pelet. Penelitian ini bertujuan untuk melakukan pengujian pengeringan sampah biomassa dengan menggunakan pengering tipe rotari (rotary dryer) serta mengatahui efisiensi kinerja dari alat pengering rotari berdasarkan variabel yang ditentukan. Variabel yang dilakukan dalam pengujian alat pengering rotari ini menggunakan ukuran pelet kayu diameter 8mm dengan laju konsumsi 48 gram/menit, putaran drum pengering 1; 1.25; dan 1.5 rpm beserta laju aliran udara pengering 33435.8; 57346.1; dan 75139.8 lpm.

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Energy demand continues to increase along with economic growth, population, energy prices, and government policies. Biomass has the potential to become one of the main energy sources in the future, and the modernization of the bioenergy system is proposed as an important contributor to future energy development, specifically for sustainable development in industrialized countries or in developing countries. Wood in Indonesia is a biomass that has long been known by the community and is a renewable energy source. To facilitate the use of wood biomass as a source of energy or fuel by processing it in the form of pellets. This study aims to test the drying of rubbish by using a rotary dryer type (rotary dryer) and know the efficiency of the performance of a rotary dryer based on the variables needed. The variables carried out in this rotary dryer test use a size of 8 mm diameter wood pellets with a consumption rate of 48 grams / minute, drum dryer rotation 1; 1.25; and 1.5 rpm with a drying air flow rate of 33435.8; 57346.1; and 75139.8 lpm."

"Kebutuhan energi di perdesaan dapat dihasilkan turbin gas berbahan bakar bioenergi mengingat bahan baku bioenergi cukup tersedia , sehingga dengan tersedianya energi di perdesaan tercipta kegiatan yang sifatnya produktif untuk membuka lapangan kerja dan mengurangi kemiskinan. Sektor properti di perkotaan yang merupakan salah satu penyerap energi terbanyak dapat juga menggunakan turbin gas berbahan bakar bioenergi sehingga tercipta bangunan yang dapat mencukupi kebutuhan energinya sendiri dari sumber energi terbarukan, hal ini merupakan konsep Zero Energy Building. Turbin gas yang diharapkan mengatasi ketersediaan energi mempunyai keunggulan yakni intalasi cepat, ukuran sistem, massa, dan biaya investasi relatif lebih rendah; dapat dioperasikan dalam keadaan dingin ; getaran yang dihasilkan jauh lebih kecil; pelumasan yang lebih sederhana; efisiensi mekanis lebih baik; dapat menggunakan bermacammacam bahan bakar; gas buangnya bersih; serta gas buang dari turbin gas dapat dimanfaatkan untuk melakukan destilasi bioetanol. Tetapi, turbin gas juga mempunyai kelemahan-kelemahan, diantaranya efisiensi termal yang rendah; degradasi komponen yang terlalu cepat; dan bencana kegagalan sistem. Kelemahan tersebut diakibatkan ketidakstabilan pembakaran yang disebabkan oleh panas yang dihasilkan oleh ruang bakar tidak tetap. Sehingga muncul pertanyaan apakah bahan bakar yang ada di dalam ruang bakar tersebut sudah terbakar maksimal; karakteristik gas yang dihasilkan oleh proses pembakaran pada ruang bakar; besarnya thermal stress yang dialami oleh ruang bakar tersebut. Metodologi yang dilakukan menjawab pertanyaan tersebut adalah melakukan percobaan dengan menggunakan turbin gas mikro Proto X-1, membuat pemodelan dan simulasi dari ruang bakar, kemudian hasil percobaan tersebut dijadikan sebagai input simulasi model ruang bakar dengan menggunakan perangkat lunak CFDSOF. Sehingga diketahui karakterisitik distribusi temperatur, distribusi bahan bakar, distribusi udara dan distribusi produk gas.

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Energy need in rural area can be filled with the use of bioenergy gas turbine, considering the bioenergy fuel availability with its raw material, which the production of bioenergy fuel can also reduce poverty by employing local laborer. Also, bioenergy gas turbine can also supply the energy need in urban property sector ? the most energy absorber. This condition help the building to meet its own energy needs with renewable energy source, called Zero Energy Building Concept (ZEB). With its advantages, i.e. quick installation, system dimension, weight, low investment cost, cold operation, lower lubricating parts, better mechanical efficiency, fuel variations operating, cleaner exhaust gas, the gas turbines are expected to carry the energy availabilities. Besides, high temperature of the exhaust gas can be used for bioethanol distillation system. However, the gas turbine also have weakness, i.e. low thermal efficiency, rapid components degradation, and system failure which caused by instability combustion as a result of unstable combustor temperature. This conditions arises whether the existing fuel in the combustion chamber is converted to fire; exhaust gas characteristics; thermal stress magnitude of the combustion chamber. A Prototype of Micro Gas Turbine Proto X-1 is designed and combustion CFD simulation has done to answer. Experimental results from the Proto X-1 are used as the input of the combustion CFD simulation which done by CFDSOF software resulting the temperature distribution, fuel distribution, air distribution, and exhaust gas distribution. "

"Renewable energy resources are increasingly being used to cover the demand in the electricity grids in many countries. A question that is currently for most grids rather theoretical, although interesting in introducing a long-term perspective, pertains to what an energy supply from exclusively renewable energy resources could look like. This question has to be answered individually for each grid. The objective of the present paper is to scrutinize the specific challenges that a 100% renewable energy scenario brings for the Java-Bali grid. This objective is achieved by designing power generation time series such that they match a given load time series. An important challenge for a 100% renewable energy supply is the very high dependency on solar energy, which generates an enormous primary power generation fluctuation on both a daily and an annual timescale. In particular the seasonal fluctuations come along with high storage demand, which is the greatest challenge involved in a 100% renewable energy supply. There are strategies that may be used to considerably reduce the storage demand: the installed photovoltaic (PV) capacity can be increased, bioenergy can be used for seasonal balancing, and special long-term storage can be added. These options are considered in the present paper."

"The availability of potential agricultural land is limited due to land conversion, prpgresive oil mapping is an effective approach to looking for potential land..."