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4th International Symposium on Advances and Innovation in Mechanical engineering, ISAIME 2023

作者： Pertiwi, Indah Ayu Muhammad Abubakar Setiawan, Adi Iskandar, Rizky Magister Program in Renewable Energy Engineering Faculty of Engineering Universitas Malikusssaleh Jalan Batam Bukit Indah Lhokseumawe24352 Indonesia Chemical Engineering Department Faculty of Engineering Universitas Malikussaleh Kampus Bukit Indah Muara Satu Lhokseumawe24352 Indonesia Mechanical Engineering Vocational Education Study Program Faculty of Teaching and Educational Science Universitas Malikussaleh Cot Teungku Nie Reuleut Muara Batu Aceh Utara24355 Indonesia Mechanical Engineering Department Faculty of Engineering Universitas Malikusssaleh Jalan Batam Bukit Indah Lhokseumawe24352 Indonesia

Sawdust is one of the industrial wastes which naturally contains low energy density. An effective method is needed to utilize this biomass as a solid fuel product. This work aimed to investigate the physical and combustion properties of bio-pellets produced from sawdust under the wet torrefaction method. To prepare sawdust bio-pellet a number of steps were carried out including the wet torrefaction process, dough preparation, pelletizing, and drying. Wet torrefaction was performed by hydrothermally treating the sample in an autoclave at a temperature of 130°C and pressure of 2 atm (g) for 80 minutes. For the hydrothermal process, the used acetic acid solution was varied with variations of 1.3 M, 1.8 M, and 2.3 M. Properties of the product were analyzed under proximate and bomb calorimetry analyses. To evaluate the combustion properties a purposely built test apparatus was developed equipped with a data logger system. Based on the results it can be observed that increases in torrefaction temperature and acetic acid concentration resulted in an increase in the calorific value as well as decreases in the ash content. The highest calorific value was 4745 kcal/kg obtained from sawdust torrefied in acetic acid with a concentration of 2.3 M at a temperature of 130?. This sample also exhibits the lowest ash content which is only 1.97%. The combustion test disclosed a maximum combustion temperature of 589? with a burning rate of 0.711 g/min. Overall, the wet torrefaction applied in this investigation was beneficially enhanced the properties of bio-pellet products. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Sawdust

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Mesoporous aluminosilicate from nanocellulose template: effect of porosity, morphology and catalytic activity for biofuel production

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Renewable energy 2025年 250卷

作者： Jovita, Stella Melenia, Alvina Tata Santoso, Eko Subagyo, Riki Tamim, Rustam Asikin-Mijan, Nurul Holilah, Holilah Bahruji, Hasliza Nugraha, Reva Edra Jalil, Aishah Abdul Tehubijuluw, Hellna Ulfa, Maria Prasetyoko, Didik Sukolilo Surabaya60111 Indonesia Department of Chemical Sciences Faculty of Science and Technology Universiti Kebangsaan Malaysia UKM Bangi Selangor Darul Ehsan 43600 Malaysia Cibinong 169111 Indonesia Centre for Advanced Material and Energy Sciences Universiti Brunei Darussalam Jl. Tungku Link BE1410 Brunei Department of Chemical Engineering Faculty of Engineering Universitas Pembangunan Nasional "Veteran" Jawa Timur Surabaya60294 Indonesia Department of Chemical Engineering Faculty of Chemical and Energy Engineering Universiti Teknologi Malaysia UTM Johor Johor Bahru81310 Malaysia Centre of Hydrogen Energy Institute of Future Energy Universiti Teknologi Malaysia UTM Johor Johor Bahru81310 Malaysia Department of Chemistry Faculty of Mathematics and Natural Sciences Pattimura University Ambon97233 Indonesia Study Program of Chemistry Education Faculty of Teacher Training and Education Sebelas Maret University Jalan Ir. Sutami 36A Central Java Surakarta57126 Indonesia

Mesoporous aluminosilicate (Al-MS) with different morphology and porosity is synthesized using a combination of sol-gel and hydrothermal methods by controlling the ratio between P123 and nanocellulose (NCC). The role of NCC as templates is elucidated based on the transformation of Al-MS from rod-like morphology with hexagonal pores to uniform nanoparticles with intraparticle mesostructure at increasing NCC ratios. Increasing NCC concentration reduced the regularity of the mesopores. TEM analysis revealed a hexagonal pore arrangement for Al-MS and Al-MS (0.25). In contrast, Al-MS (1) with only NCC shows disordered mesostructure. Optimization of P123:NCC ratio enhances the Vmeso/Vmicro to reach the optimum value of ∼18.65, which is essential to enhance hydrocarbon yield. Al-MS (0.25) is the most active catalyst for deoxygenation (DO) of Calophyllum inophyllum oil, reaching 95.98 % conversion, 50.77 % liquid yield and 60.27 % selectivity towards n-(C15+17) hydrocarbon. In general, Al-MS (0.25) demonstrates outstanding performance owing to its good physicochemical characteristics and acidity. © 2025 Elsevier Ltd

关键词： Mesoporous materials

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Overview of Hysteresis Current Controller Application in Renewable energy Based Power Systems

Overview of Hysteresis Current Controller Application in Ren...

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International Conference on Science and Innovated engineering 2018, i-COSINE 2018

作者： Yunus, A. M. Shiddiq Swasti, Sri Purwito Energy Conversion Study Program Mechanical Engineering Department Politeknik Negeri Ujung Pandang Indonesia Electric Power Engineering Study Program Electrical Engineering Department Politeknik Negeri Ujung Pandang Indonesia

This paper presents an overview of the Hysteresis Current Controller (HCC) application in Renewable energy Based Power System. The beginning concept of HCC is considered to be formally introduced by Thomas M. Freederiksen and Ronald W. Russel in 1971 that was registered in US Patent No. US3725673. The fundamental principle of HCC is based on the comparison of the instantaneous load current to the instantaneous sine wave reference where the difference between the two is maintained within the defined upper and lower band. There are some advantages of using HCC including simple, insensitivity to load parameters variations, fast dynamic response and inherent maximum current limiting characteristics. Therefore, based on its robustness, HCC has currently applied also in renewable energy based power plants such as PV converter system, Power Electronics System of Wind energy, and in SMES control system for Wind energy Application. However, the drawback of HCC system was also discussed in some papers compared with other control systems, for instant HCC is giving high chattering in torque in IM drive test. Therefore the combination of HCC with other controllers also becomes a new trend to improve the applied system that involving HCC as the main controller. © Published under licence by IOP Publishing Ltd.

关键词： Wind power

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Upgrading process of palm empty fruit bunches as alternative solid fuel: a review

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Clean energy 2023年第6期7卷 1173-1188页

作者： Toto Hardianto Ari Akbariyanto Wenas Firman Bagja Juangsa Energy Conversion Research Group Faculty of Mechanical and Aerospace EngineeringInstitut Teknologi BandungWest JavaIndonesia Research Center for New and Renewable Energy Institut Teknologi BandungWest JavaIndonesia Mechanical Engineering Study Program Faculty of Mechanical and Aerospace EngineeringInstitut Teknologi BandungWest JavaIndonesia

A total of 37.5 million tons of palm empty fruit bunches(EFBs)produced in Indonesia in 2018 have the potential to be used as an alternative eco-friendly solid ***,a pretreatment process is necessary to increase the heating value and reduce the po-tassium content of *** methods can be employed to improve the characteristics of EFBs as a solid fuel,such as drying and torrefaction to increase the heating value and the leaching process for reducing the potassium content of *** main concept of increasing the heating value is to increase the fuel content,which is *** drying,the carbon ratio can be increased by reducing the moisture content and,through torrefaction,the carbon ratio could be increased due to the decomposition of ligno-cellulose.A simple way to reduce the potassium content of EFBs is the leaching *** types of leaching treatment have been studied before:soaking and stirring *** study reviews those methods to make EFBs more suitable as a solid fuel with a high heating value and less potassium *** the carbon content in EFBs is crucial for enhancing their heating value as a *** and torrefaction decrease the moisture content and modify the chemical structure,resulting in higher carbon *** leaching process effectively reduces the potassium content of EFBs and stirring treatment is more effective than immersion *** positively affects leaching by decreasing the potassium content,while hydrophobicity may hinder leaching by re-pelling *** high moisture content of leached EFBs requires additional energy for evaporation during torrefaction,resulting in a lower energy density yield compared with raw *** may also be required to account for the decreased mineral content,which functions as a torrefaction catalyst in EFBs that have not been leached.

关键词： biomass EFB solid fuel torrefaction upgrading

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Sag and Flicker Reduction Using Hysteresis-Fuzzy Control-Based SMES Unit

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Canadian Journal of Electrical and Computer engineering 2019年第1期42卷 52-57页

作者： Yunus, A. M. Shiddiq Habriansyah, Imran Abu-Siada, Ahmed Masoum, Mohammad A.S. Energy Conversion Study Program Mechanical Engineering Department State Polytechnic of Ujung Pandang Makassar90245 Indonesia Mechatronics Study Program Mechanical Engineering Department State Polytechnic of Ujung Pandang Makassar90245 Indonesia Electrical and Computer Engineering Department University of Curtin University BentleyWA6102 United States Department of Engineering Utah Valley University OremUT84058 United States

The issue of power quality is one of the prominent factors in determining the reliability of power systems. It is inevitable to consider power quality issues and include appropriate mitigation techniques in the design of any future power system project construction. Voltage sag and flicker are the two most common short disturbance types of power quality issues that frequently occur in power systems. A widely accepted mitigation strategy to enhance the power quality of disturbed networks is by connecting a flexible ac transmission system. In this paper, a superconducting magnetic energy storage (SMES) unit along with hysteresis-fuzzy controller to suppress the severe impacts of voltage sag and flicker events on the power quality of a power system is proposed, implemented, and tested. The proposed SMES configuration with hysteresis current control and fuzzy logic controller is effective, simple, and easy to implement. Simulation results show the ability of the proposed SMES controller in compensating sag and/or flicker distortions. © 2003-2010 IEEE Canada.

关键词： Power quality

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Used cooking oil catalytic cracking using Cr-charcoal ion-exchanged catalyst 6

Used cooking oil catalytic cracking using Cr-charcoal ion-ex...

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6th International Conference on Mathematics, Science, and Education, ICMSE 2019

作者： Nazarudin Ulyarti Alfernando, O. Fitri, S. 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

Used cooking oil is the largest waste that can be converted into biofuel as a renewable alternative energy source with catalytic cracking process. In this study, used cooking oil was cracked using a Cr-Carbon catalyst. The charcoal was produced from solid waste (shell) of oil palm industry. Three different chromium concentrations (1, 2, and 3%) were used for the ion-exchange process of Cr-charcoal to produce the catalyst. These catalysts were used for the catalytic cracking of used cooking oil at three levels of temperature (450, 500, and 550°C). X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis were used for catalyst characterization. SEM-energy dispersive X-ray spectroscopy (EDX) analysis indicates that Cr was successfully adsorbed into the catalyst. The highest oil fraction was obtained from catalytic cracking of used cooking oil at 450°C using Cr-charcoal catalyst synthesized using 1% Cr solution. © Published under licence by IOP Publishing Ltd.

关键词： Catalysts

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Impacts of Grid Frequency Variation on Dynamic Performance of DFIG Based Wind Turbine 5

Impacts of Grid Frequency Variation on Dynamic Performance o...

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5th International Symposium on Material, Mechatronics and energy 2018, ISMME 2018

作者： Shiddiq Yunus, A.M. Energy Conversion Study Program Mechanical Engineering Department Politeknik Negeri Ujung Pandang Indonesia

Wind energy is one of popular sources of renewable energy that massively used to generate electric power nowadays. Among wind generator technologies, Doubly Fed Induction Generator (DFIG) is placed as the first dominant wind generator type that is installed worldwide since 2004. Its popularity is due to the advantages of its capability to extract more energy compare to the fixed speed type. Moreover, it uses only one-third converter size which reduced the total construction cost compared to its closest rival, Full Converter Wind Turbine Generator Type. Although DFIG widely installed worldwide, it is in fact, very sensitive to the grid disturbances such as frequency variation. Based on IEEE standard for 60 Hz system, a power system should not be allowed to work in less than 59.3 Hz or more than 60.5 Hz. In this paper, DFIG-grid connected is extensively simulated in the condition of frequency variation that is carried out using Matlab/Simulink. The results show that some important parameters such as power output of the generator, voltage at point of common coupling, voltage at DC link and generator speed are experiencing significant rise/drop which in turn might damage the wind turbine generator. © Published under licence by IOP Publishing Ltd.

关键词： Wind Turbine Generators

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The Effect of ADAS System on Driving Safety in a Heavy Electric Vehicle 7

The Effect of ADAS System on Driving Safety in a Heavy Elect...

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7th International Conference on Electric Vehicular Technology, ICEVT 2022

作者： Hidayati, Noor Prasetya, Sonki Handaya, Devi Kamal, Dianta Mustofa Labibah, Shenni Meila Khalda Politeknik Negeri Jakarta Applied Undergraduate Study Program of Manufacturing Engineering Depok Indonesia Politeknik Negeri Jakarta Diploma 3 in Mechanical Engineering Study Program Depok Indonesia Politeknik Negeri Jakarta Magister of Manufacturing Technology Engineering Depok Indonesia Politeknik Negeri Jakarta Study Program of Energy Conversion Engineering Depok Indonesia

ISBN: (数字)9781665409421

ISBN: (纸本)9781665409421

The use of intelligent technology has been widely applied to vehicles. ADAS (Advanced Driver Assistance System) is one of the smart features embedded in vehicles, generally directed to assist in driving a vehicle and for safety, such as braking. The development of ADAS is the first step toward an autonomous vehicle system. The braking system currently relies on several detectors, namely Radar, LiDAR, and cameras. The current use of ADAS usually uses a radar system or the integration of radar and cameras. This article aims to analyze the impact of using ADAS in braking assistance with the help of a stereo camera as the object detector to know how much influence intelligent systems for ADAS in driving. Several speeds are compared to see the vehicle's response and the effect of the applied speed with the camera properly. The results show that the speed response can be increased by 0.3 seconds to reduce the delay in the driver's awareness response to identify the object in front of him. Furthermore, the use of a camera-based system as a tool in ADAS in this study can be used for medium speeds of about 50 km/hour. © 2022 IEEE.

关键词： Advanced driver assistance systems

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Evaluation Electrical System of Mini Plant Waste energy on Institut Teknologi PLN 2

Evaluation Electrical System of Mini Plant Waste Energy on I...

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2nd International Conference on Converging Technology in Electrical and Information engineering, ICCTEIE 2023

作者： Pawenary Listiawati, Dwi Hendri Insitut Teknologi PLN Electrical Engineering Study Program Faculty of Electricity and Renewable Energy Jakarta Indonesia

ISBN: (纸本)9798350370645

Waste is a problem in almost every region, especially related to how the processing of waste can be converted into other forms as a form of energy that can be utilized, one of which is waste processing by pyrolysis is one of the technologies to convert waste into useful energy or fuel. At this time waste processing requires waste processing machines ranging from organic and un-organic waste shredding machines, briquette processing machines, pellets, using star-delta 3-phase motors, generally still conventional/manually. Current research, the author began to develop a waste and flue gas particle handling machine, a non-incinerator pyrolysis machine with the wet method, a high efficiency cyclone system which originally used a machine manually/ conventionally, replaced with a Delta series Star - Delta series with interlock and interface) automatically. Garbage processing The machine in addition to aiming to reduce waste waste, the machine must be made automatically and friendly to the operator who runs it. © 2023 IEEE.

关键词： Pyrolysis

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Calibration of 100 A/50mA instrument current transformer energy meter using bisection method 2

Calibration of 100 A/50mA instrument current transformer ene...

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2nd IEEE International Conference on Innovative Research and Development, ICIRD 2019

作者： Bimantoro, Renardi Ardiya Rahardjo, Amien Husnayain, Faiz Aryani, Dwi Riana Hudayala, Chairul Universitas Indonesia Department of Electrical Engineering Faculty of Engineering Depok16424 Indonesia Energy System Engineering Master Study Program Faculty of Engineering Universitas Indonesia Depok16424 Indonesia

ISBN: (纸本)9781728128252

Instrument current transformers (CTs) are widely used in various types of electrical energy measurement. Eddy current losses, losses of hysteresis, a saturation of CT, and inevitable flux leaks could lead to errors including errors in the ratio and phase angle. Improving the accuracy of CT measurement could be achieved in many ways. In this study, a bisection calibration method to overcome the error by implementing correction factor integrated with the Arduino codes is investigated. The reliability of this system has been tested in two different situations, which are a constant and variable load experiments. The result shows that the readout of the developed instrument using 100 A/50mA CT could achieve the deviation value of less than 2%, confirming the excellence accuracy of energy meter. © 2019 IEEE.

关键词： Electric instrument transformers

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