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SSRN 2023年

作者： Rahmadiawan, Dieter Abral, Hairul Shi, Shih-Chen Ilham, Mohammad Khalid Sugiarti, Eni Muslimin, Ahmad Novi Ilyas, R.A. Zainul, Rahadian Department of Mechanical Engineering Universitas Negeri Padang Sumatera Barat Padang25173 Indonesia Tainan Taiwan Laboratory of Nanoscience and Technology Department of Mechanical Engineering Andalas University Sumatera Barat Padang25163 Indonesia Research Collaboration Center for Nanocellulose BRIN-Andalas University Padang25163 Indonesia Serpong Indonesia Weaponry Technology Study Program Defense Technology Faculty Indonesia Defense University Sentul Bogor16810 Indonesia School of Chemical and Energy Engineering Faculty of Engineering Universiti Teknologi Malaysia Johor Bahru81310 Malaysia Department of Chemistry Faculty of Mathematics and Natural Science Universitas Negeri Padang West Sumatera 25171 Indonesia

The preparation method of cellulose films plays a vital role in their properties. This work aims to characterize 2, 2, 6, 6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidized bacterial cellulose powder (TOBCP) films prepared with three different methods (casting, boiling-casting, and boiling-vacuum). It is found that film by casting (CT film) shows the best electrical properties. A light-emitting diode (LED) in a direct current circuit connected to the CT film glows the most brightly. However, this film had lower tensile strength and thermal stability than films from boiling and boiling-vacuum techniques. The boiling-vacuum film presents the most compact fiber structure and the highest tensile and thermal properties. This film also shows the lowest electrical properties and the dimmest LED light. These results demonstrate the TOBCP properties from different methods that can be used to prepare film with desirable properties. © 2023, The Authors. All rights reserved.

关键词： Light emitting diodes

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Green prosperity: a natural-based solution for rural electrification in Indonesia

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IOP Conference Series: Earth and Environmental Science 2021年第1期749卷

作者： J Wahono D W Djamari M A Nurhadiyanto A L S Azmi Clean Power Indonesia Mechanical Engineering Study Program Sampoerna University Jakarta Indonesia M-Renewable Energy Division of IAM ITB

Primary energy demand in Indonesia is growing rapidly due to urbanization, economic growth and population increase. The contribution of New and Renewable energy to the national energy mix is mandated to reach 23 % by 2025. Indonesia's Nationally Determined Contributions (NDC) stresses five sectors in which greenhouse gas (GHG) emissions are to be reduced with forestry and energy being the highest priority. While Indonesia is committed to address climate change through the forestry sector, there are clearly contextual challenges that need to be addressed to create the enabling conditions for REDD+. Biomass production for local energy supply in remote and rural areas could become the agent of change for this difficult problem. This paper proposes a methodology for rural electrification using a community and biomass-based power generation system exemplified by a real case in the Mentawai islands in Indonesia. By replicating this proven system that results in biomass production, land restoration, affordable electricity, and local economic growth, the contribution of renewable energy in the energy mix and the overall prosperity of Indonesians in rural and remote areas can be improved.

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A comprehensive analysis of wind power integrated with solar and hydrogen storage systems: Case study of Java's Southern coast

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International Journal of Hydrogen energy 2024年

作者： Hesty, Nurry Widya Fauziah, Khotimatul Aminuddin Zaky, Toha Fithri, Silvy Rahmah Aman, Mohamad Aziz, Amiral Rostyono, Didik Wijayanto, Rudi Purwo Ifanda Research Center for Energy Conversion and Conservation National Research and Innovation Agency KST BJ Habibie Serpong Tangerang Selatan15343 Indonesia Research Center for Process and Manufacturing Industry Technology National Research and Innovation Agency Building 625 KST BJ Habibie Serpong Banten Tangerang Selatan15314 Indonesia Magister of Industrial Engineering University of Mercu Buana Jakarta11650 Indonesia Study Program of Advanced Climatology Department of Geophysics and Meteorology IPB University Bogor16680 Indonesia Survey and Testing Center for Electricity New Renewable Energy and Energy Conservation Technology Ministry of Energy and Mineral Resources Jakarta12230 Indonesia

Wind and solar energy are vital to the global transition toward sustainable energy systems, driven by the need to reduce fossil fuel dependence, mitigate climate change, and enhance energy security. This study aims to optimize system performance by integrating hydrogen technology and addressing capacity shortages and excess energy. First, a comprehensive analysis of wind characteristics in a strategically important area to meet unaccomplished Indonesia's 2023 wind energy targets, focusing on Java's southern coast using wind speed data from the System Advisor Model (SAM), was conducted. Four scenarios are then evaluated: wind turbine (WT)-battery energy storage system (BESS), WT-photovoltaic (PV)-BESS, WT-fuel cell (FC)-electrolyzer (EL)-hydrogen tank (H2T), and WT-PV–FC–EL-H2T. Key metrics analyzed include excess energy, Levelized Cost of Electricity (LCOE), Net Present Cost (NPC), capacity shortage (CS), and electrolyzer full-load hours (EFH). Results show that average wind speeds reach 4.2 m/s in Pandeglang, with the WT–FC–EL-H2T system being the most reliable, exhibiting a 5% capacity shortage and 68.5% excess electricity. The WT-PV–FC–EL scenario is the most cost-effective, with a COE of $0.508/kWh and an NPC of $2.6 million. These findings provide valuable insights for improving sustainable energy infrastructure in the region. © 2024 Hydrogen energy Publications LLC

关键词： Clean energy

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Catalytic cracking of used cooking oil using Chromium impregnated charcoal (Cr-charcoal) catalyst

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Journal of Physics: Conference Series 2020年第2期1567卷

作者： Nazarudin I G Prabasari Ulyarti Susilawati A Oktadio Chemistry Engineering Study Program Faculty of Engineering Universitas Jambi Indonesia Chemistry Education Study Program Faculty of Teacher Training and Education Universitas Jambi Indonesia Center of Energy and Nanomaterial Study Universitas Jambi Indonesia Agricultural Product Technology Study Program Faculty of Agricultural Technology Universitas Jambi Indonesia Physical Education Faculty of Teacher Training and Education Universitas Mataram Indonesia

One of the solutions for fossil fuel crisis is to find alternative energy based on renewable materials. In this research, catalytic cracking of used cooking oil has been investigated to produce biofuel using Cr-charcoal catalyst. The charcoal was produced from solid waste (shell) of palm oil industry. Chromium solutions with various concentrations (1%, 2%, and 3%) were impregnated into charcoal to produce Cr-charcoal catalyst. The catalysts were used for catalytic cracking of used cooking oil at three levels of temperature: 450°C, 500°C and 550°C. The XRD patterns and SEM images of the catalyst showed that the catalyst was in amorphous form. SEM-EDX analysis showed that the Chromium was impregnated into charcoal successfully with amount of Chromium absorbed into charcoal was 0.51%; 1.07% and 14.38% respectively. The SEM images also showed that charcoal as supported catalyst and Cr-charcoal catalyst have unique pores. The highest liquid oil fraction was obtained by catalytic cracking at 500°C using 3% Cr-Charcoal catalyst. The liquid product of this process was mainly diesel oil with 8-24 carbon atoms (86.35%) and the rest was liquid product with 6-7 carbon atoms.

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Biomass waste as an alternative source of carbon and silicon-based absorbents for CO2 capturing application

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Chemosphere 2023年 343卷

作者： Suresh, R. Gnanasekaran, Lalitha Rajendran, Saravanan Jalil, A.A. Soto-Moscoso, Matias Khoo, Kuan Shiong Ma, Zengling Halimatul Munawaroh, Heli Siti Show, Pau Loke Departamento de Ingeniería Mecánica Facultad de Ingeniería Universidad de Tarapacá Avda. General Velásquez 1775 Arica Chile University Centre for Research & Development Department of Mechanical Engineering Chandigarh University Punjab Mohali140413 India Department of Chemical Engineering Lebanese American University Byblos Lebanon Centre of Hydrogen Energy Institute of Future Energy Johor UTM Johor Bahru81310 Malaysia Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia Johor UTM Johor Bahru81310 Malaysia Universidad Autónoma de Chile Chile Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan Taiwan Centre for Herbal Pharmacology and Environmental Sustainability Chettinad Hospital and Research Institute Chettinad Academy of Research and Education Tamil Nadu Kelambakkam603103 India Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection Wenzhou University Wenzhou325035 China Study Program of Chemistry Faculty of Mathematics and Science Education Universitas Pendidikan Indonesia Jalan Dr. Setiabudhi 229 Bandung40154 Indonesia Department of Chemical Engineering Khalifa University P.O. Box 127788 Abu Dhabi United Arab Emirates Department of Chemical and Environmental Engineering Faculty of Science and Engineering University of Nottingham Malaysia Jalan Broga Selangor Darul Ehsan Semenyih Malaysia

The production of low-cost solid adsorbents for carbon dioxide (CO2) capture has gained massive consideration. Biomass wastes are preferred as precursors for synthesis of CO2 solid adsorbents, due to their high CO2 adsorption efficiency, and ease of scalable low-cost production. This review particularly focuses on waste biomass-derived adsorbents with their CO2 adsorption performances. Specifically, studies related to carbon (biochar and activated carbon) and silicon (silicates and geopolymers)-based adsorbents were summarized. The impact of experimental parameters including nature of biomass, synthesis route, carbonization temperature and type of activation methods on the CO2 adsorption capacities of biomass-derived pure carbon and silicon-based adsorbents were evaluated. The development of various enhancement strategies on biomass-derived adsorbents for CO2 capture and their responsible factors that impact adsorbent's CO2 capture proficiency were also reviewed. The possible CO2 adsorption mechanisms on the adsorbent's surface were highlighted. The challenges and research gaps identified in this research area have also been emphasized, which will help as further research prospects. © 2023 Elsevier Ltd

关键词： Carbon dioxide

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Analysis of Electricity Generation from Landfill Gas (Case study: Manggar Landfill, Balikpapan)

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IOP Conference Series: Earth and Environmental Science 2020年第1期448卷

作者： C K Banaget B Frick M N I L Saud Environmental Engineering Study Program Institut Teknologi Kalimantan Balikpapan 76127 Indonesia Energy Engineering Department Polytech Annecy-Chambery Universite Savoie Mont Blanc Annecy 74940 France

Despite of adverse impacts on the environment, landfill has big potency as renewable energy sources since it generates biogas from organic waste degradation process which can be used for power plant purposes. In 2017, the volume of waste disposed to Manggar Landfill was 128, 000 tons, which mostly are organic waste (59.4%). Therefore, this study aims to estimate the amount of energy that can be generated from landfill as methane, by calculating biogas production in landfill based on waste generation, as well as composition using LandGem and Afvalzorg model. In 2017, Manggar landfill produced about 4×103Mg CH4/year or about 5.31 to 6.44×106 m3/year. The estimated methane then converted to electricity using gas engine and trigeneration methods. Using gas engine, methane from Manggar Landfill is predicted to produce electricity about 787 MWh/month. On the other hand, if trigeneration method applied (by keeping the same gas engine as before), it produces 41.8% of heat which convert to 29.3 kWh of cold. In conclusion, it will be beneficial if Manggar Landfill capture and treat methane for generating electricity since Manggar Landfill produces about 6.44×106 m3/year which can be used for electricity purposes of around 10, 000 people using gas engine.

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Make-up wells drilling cost in financial model for a geothermal project

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IOP Conference Series: Earth and Environmental Science 2017年第1期103卷

作者： Fitri Oktaviani Purwaningsih Ruly Husnie Waldy Afuar Gugun Abdurrahman Study Program of Geothermal Engineering Faculty of Mining and Petroleum Bandung Institute of Technology Bandung Indonesia PT Geo Dipa Energy Jakarta Indonesia

After commissioning of a power plant, geothermal reservoir will encounter pressure decline, which will affect wells productivity. Therefore, further drilling is carried out to enhance steam production. Make-up wells are production wells drilled inside an already confirmed reservoir to maintain steam production in a certain level. Based on Sanyal (2004), geothermal power cost consists of three components, those are capital cost, O&M cost and make-up drilling cost. The make-up drilling cost component is a major part of power cost which will give big influence in a whole economical value of the project. The objective of this paper it to analyse the make-up wells drilling cost component in financial model of a geothermal power project. The research will calculate make-up wells requirements, drilling costs as a function of time and how they influence the financial model and affect the power cost. The best scenario in determining make-up wells strategy in relation with the project financial model would be the result of this research.

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Micro Hydro Electric Power Plant (MHEP) Prototype A study Of The Effect Of Blade Numbers Toward Turbine Rotational Velocity

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Journal of Physics: Conference Series 2019年第4期1198卷

作者： Ibnu Asrafi M. Yerizam Sairul Effendi Agung Mataram Renewable Energy Study Program Applied Sciences Master Program Politeknik Negeri Sriwijaya Jalan Srijaya Negara Bukit Besar Palembang Engineering Department Politeknik Negeri Sriwijaya Mechanical Engineering Department Politeknik Negeri Sriwijaya Palembang Mechanical Engineering Department Engineering Facult Sriwijaya University Sumatera Selatan Indonesia

Micro hydro electric power plant (MEPP) prototype is a small scale power plant (less than 100 kW) that utilizes height difference and water discharge per second. Prototype consists of a water pump, where capacity of 41 liter per minute serving as turbine driving force channelled through a nozzle, with a 40 liter water reservoir, and the water flow rate controller is a gate valve. The results show that at blade counts of 4,8,12, and 16, and with water discharge at 40 l/s, 35 l/s, 30l/s, and 25 l/s, with nozzle shooting angle of 50 °, the turbine rotational velocities are 310 rpm, 639 rpm, 655.5 rpm, and 691.3 rpm respectively. Furthermore, at water discharge of 35 l/s, the velocities are 293.3 rpm, 375,3 rpm, 412.7 rpm, 446.2 rpm, and at water discharge of 30 l/s, they are 240.3 Rpm, 395.0 rpm, 430.5 rpm, 445.2 Rpm. Moreover, at water discharge 25 of l/s, the speeds are 285.5 rpm, 330.5 rpm, 426.0 rpm, 431.1 rpm. It is concluded that the higher the water discharge rate, the greater the number of rotation, and it is also concluded that shooting angle has a significant effects on pelton turbine rotation and power.

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Fatty Acids From Microalgae Botryococcus braunii For Raw Material of Biodiesel

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Journal of Physics: Conference Series 2018年第1期1095卷

作者： P Dilia K Leila Rusdianasari Applied Master of Renewable Energy Engineering Politeknik Negeri Sriwijaya Jl. Srijaya Negara 30139 Palembang Indonesia Renewable Energy Engineering Study Program Politeknik Negeri Sriwijaya Jl. Srijaya Negara 30139 Palembang Indonesia

One of the alternative sources of renewable energy that can overcome the environmental crises and the current fossil energy crisis is microalgae. Microalgae contain fatty acids that can be converted into biofuel products, such as biodiesel. This study was a preliminary research which was conducted to determine the amount of fatty acids contained in microalgae and its potentiality to be converted into biodiesel. The microalgae used in this study were Botryococcus braunii. Data collection of fatty acids of Botryococcus braunii were obtained by the direct analysis in the laboratory using an instrument in the form of gas chromatography mass spectrometry (GC-MS) and also obtained from literature study in several research of previous researcher. Based on that, it was found out that Botryococcus braunii contained with oleic acid ranged from 15.65 – 35.85%, linoleic acid 3.05 – 23.15%, palmitic acid 4.03 – 22.13 % and stearic acid 0.48 – 15.41%. The profile and fatty acid content of this preliminary study could be one of the decisive parameters in the selection of microalgae species. Based on results concluded that Botryococcus braunii had good potentiality to be converted into biodiesel because the ratio of saturated and unsaturated fatty acids in this species is not much different.

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Effect of Catalysts on the Quality of Biodiesel from Waste Cooking Oil by Induction Heating

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Journal of Physics: Conference Series 2020年第1期1500卷

作者： Rusdianasari Aida Syarif Muhammad Yerizam M. Syahirman Yusi Leila Kalsum Yohandri Bow Renewable Energy Engineering Department Politeknik Negeri Sriwijaya Jl. Srijaya Negara Palembang 30139 Indonesia Chemical Engineering Department Energy Engineering Study Program Politeknik Negeri Sriwijaya Palembang 30139 Indonesia Business Administration Department Politeknik Negeri Sriwijaya Palembang Indonesia

The target of increasing the use of renewable fuels is directly proportional to the increasing demand for biodiesel. High demand for biodiesel must be balanced with sufficient availability from producers. One of the factors that influence biodiesel conversion rate is the use of catalysts. The use of sodium teoxide (CH3ONa) catalyst in the manufacture of biodiesel can be applied in the process of biodiesel production using induction heating technology. This technology will accelerate the heating process needed in the transesterification reaction. Based on research that has been done, the use of a catalyst concentration of 1% will produce a yield of 86.95% with product quality in accordance with SNI such as density 0.858 gr/cm3, viscosity 5.727 cSt, flash point 190°C, and acid number 0.439 mg-KOH/gr.

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