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Study of Development Scenarios for Bottoming Unit Binary Cycle to Utilize Exhaust Steam from Back Pressure Turbine Geothermal Power Plant

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IOP Conference Series: Earth and Environmental Science 2020年第1期417卷

作者： Naufal Nandaliarasyad Dimas Taha Maulana Prihadi Setyo Darmanto Geothermal Master Program Faculty of Mining and Petroleum Engineering Institute of Technology Bandung Faculty of Mechanical and Aerospace Engineering Institute of Technology Bandung Institute of Technology Bandung Jl. Ganesha No.10 Bandung West Java Indonesia. 40132

Binary cycle using organic working fluid or ORC system has been applied in geothermal and some other industrial processes to recover low grade and waste energy to generate electricity. The conventional system to utilize geothermal energy is a condensing system or back pressure system which depend on a turbine used in the system. Two units of the power plant in Flores, Indonesia are using back pressure turbine, which means that there is still a chance to increase the electrical power of the steam which is released through the turbine. The amount of exhaust steam available from these two units power plant is more than 62,000 kg per hour with 99°C of temperature and around 2,430 kJ/kg enthalpy. This research is trying to get the optimum power that can be generated by the ORC regarding other consideration parameters such as ambient temperature, thermodynamics condition of resource steam, and energy conversion of each apparatus. It is the aim of this paper to present a thermodynamic study on the utilization of ORC as the bottoming cycle with various types of working fluids to produce additional electricity. Several working fluids are chosen to find the optimum ORC system to utilize this exhaust steam such as isobutane, butane, isobutene, isopentane, propane, propyne, neopentane, R245fa, R236fa, and R134a. ORC system used in this research is simple ORC with basic components such as Pre-Heater, Evaporator, Expander, Condenser, and Pump. The properties of working fluids are calculated by REFPROP. The results show that this binary cycle can generate up to 2.25 MW with the thermal efficiency around 10% depend on the working fluid used. Two working fluids in this scenario that provide the best power generated are Propyne and Isopentane. The type of working fluid must also be considered, propyne is a wet type while isopentane is a dry type working fluid.

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Nanocatalyst manganese oxide (MnO) for exhaust emissions (CO and HC) reduction 1

Nanocatalyst manganese oxide (MnO) for exhaust emissions (CO...

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1st Materials Research Society-Indonesia Conference and Congress 2017, MRS-INA C and C 2017

作者： Puspitasari, P. Sasongko, M.I.N. Kurniawan, G.A. Andoko, A. Tsamroh, D.I. Mechanical Engineering Department Engineering Faculty Malang State University Semarang Street 5 East-Java-Malang Indonesia Center of Nano Research and Advanced Materials Malang State University Semarang Street 5 East-Java-Malang Indonesia Master Program Postgraduate Program Malang State University Semarang Street 5 East-Java-Malang Indonesia

The growing number of motor vehicles, particularly the exhaust gas as a result of incomplete combustion of fuels, has a very adverse impact on the environment. One effort to reduce exhaust emission levels is by applying a catalytic converter to the exhaust system. MnO is a chemical mixture that can be applied to a catalytic converter to reduce exhaust emissions because it is capable of binding CO and HC contained in motorcycle exhaust gases. This research was an experimental research aiming to investigate the difference in emission level of CO and HC between a motorcycle with and without a catalytic converter. The types of fuel used were RON 88 and RON 92. The results showed that the application of MnO as a catalyst could reduce the level of CO significantly in RON 88, i.e. 24.36%, and the level of HC in RON 88 and RON 92, i.e. 82.08% and 38.14 % respectively. © Published under licence by IOP Publishing Ltd.

关键词： Manganese oxide

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Application of nanocatalyst iron oxide (Fe2O3) to reduce exhaust emissions (CO and HC) 1

Application of nanocatalyst iron oxide (Fe2O3) to reduce exh...

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1st Materials Research Society-Indonesia Conference and Congress 2017, MRS-INA C and C 2017

作者： Puspitasari, P. Yazirin, C. Bachtiar, L.A. Dika, J.W. Zaharis, S.M.S.N.S. Mechanical Engineering Department Engineering Faculty Malang State University Semarang street 5 East-Java-Malang Indonesia Center of Nano Research and Advanced Materials Malang State University Semarang street 5 East-Java-Malang Indonesia Master Program of Mechanical Engineering Engineering Faculty Malang State University Semarang street 5 East-Java-Malang Indonesia Bachelor Program Mechanical Engineering Department Malang State University Semarang street 5 East-Java-Malang Indonesia Industrial Chemical Technology Programme Faculty of Science and Technology Universiti Sains Islam Malaysia Bandar Baru Nilai Negeri Sembilan Nilai71800 Malaysia

Fe2O3 has been the interest of many studies due to its applications in various scientific and industrial fields including in environment, corrosion, soil science, and exhaust emissions. Fe2O3 is a chemical mixture that can be applied as a catalyst to reduce exhaust emissions because it is capable of binding CO and HC contained in motorcycle exhaust gases The growth of motor vehicles results in air pollution and an increase in exhaust emissions consisting of 70.50% CO and 18.34% HC. One effort to reduce exhaust emission levels is by applying a catalytic converter to the exhaust system. This research was an experimental research aiming to investigate the difference in emission level of CO and HC between a motorcycle with and without a catalytic converter. The types of fuel used were RON 88, RON 90, RON 92, and RON 98. The results showed that the application of Fe2O3 as a catalyst could reduce the level of CO significantly in RON 88, i.e. 91.43% CO, and the level of HC in RON 88 and RON 92, i.e. 53.27% and 91.07% HC respectively. © Published under licence by IOP Publishing Ltd.

关键词： Catalytic converters

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Improvement of the ungrounded force display using grooved cam

Improvement of the ungrounded force display using grooved ca...

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IEEE International Conference on Industrial Informatics (INDIN)

作者： Emi Kakuda Sho Yokota Akihiro Matsumoto Daisuke Chugo Hiroshi Hashimoto Graduate School of Science and Eng Toro University Kawagoe Japan Dept. of Mechanical Engineering Toyo University Kawagoe Japan School of Science and Technology Kwansei Gakuin University Hyogo Japan Master Program of Innovation for Design and Eng. Advanced Institute of Industrial Technology Tokyo Japan

This paper proposes the ungrounded force display using the grooved cam. Using the human illusion, the user can feel the force in the one direction when they use proposed device. It is mainly configured the cam and the slider. The slider follows the cam and moves translational movement. In this paper, we create the new prototype which solving the problems that emerged from the previous prototype. We evaluate the device using the two experiments. One is the subjective evaluation. Second one is the force presentation from the new prototype as the quantitative evaluation. We could solve problems of previous prototype by changing the cam type from plate to groove and blushless motor, and the new one produce the force more clearly than the previous prototype.

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Investigation on kinetic and thermodynamic parameters of Cerbera manghas de-oiled seed as renewable energy during the pyrolysis process

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AIP Conference Proceedings 2020年第1期2228卷

作者： M. Muzayyin S. Sukarni R. Wulandari Master Program of Mechanical Engineering Graduate School Universitas Negeri Malang Semarang Street 5 Malang 65145 East Java Indonesia Department of Mechanical Engineering Universitas Negeri Malang Semarang Street 5 Malang 65145 Indonesia Centre of Advanced Materials for Renewable Energy Universitas Negeri Malang Semarang Street 5 Malang 65145 Indonesia

The investigation of renewable energy sources is critical regarding the availability of energy in the future. This study was aimed to understand the potential of Cerbera manghas de-oiled seed by investigating the kinetic and thermodynamic parameters during the pyrolysis process. The de-oiled seed was obtained by the pressing of the seed at 33.81 N/m2 to release its oil content. The de-oiled seed sample was subjected to the thermogravimetric analyzer (Mettler Toledo TGA-DSC1) to knowing the characteristics of the sample during the time of thermal decomposition. The kinetic parameters were studied using the Coats-Redfern method. The results showed that the de-oiled seed decomposed into three stages; the first stage occurs at temperatures of 25-178 °C, the second stage occurs at temperatures of 189-488 °C, and the third stage at temperatures of 500-900 °C, with the very low residue of 15.4 % was leftover at the final thermal processes. The kinetics analysis resulted in the activation energy, reaction order, and pre-exponential factor of 27.42 kJ/mol, 0.94, and 68,64 min−1, respectively. Following the kinetic results, then the thermodynamic parameters were analyzed and resulted in the values of ΔH (enthalpy), ΔG (Gibbs free energy), and ΔS (entropy) that were 22.40 kJ/mol, 171.86 kJ/mol, and -0.2230 kJ/mol, respectively. From the results of this study, it could conclude that the de-oiled seed of Cerbera manghas has potential as a renewable energy source.

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Angle Control of Antagonistic Pneumatic Driven and Inflatable Arm Joint

Angle Control of Antagonistic Pneumatic Driven and Inflatabl...

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IEEE International Conference on Industrial Informatics (INDIN)

作者： Hirofusa Ogasawara Sho Yokota Akihiro Matsumoto Daisuke Chugo Hiroshi Hashimoto Graduate School of Science and Eng. Toyo University Kawagoe Japan Dept. of Mechanical Engineering Toyo University Kawagoe Japan School of Science and Technology Kwansei Gakuin University Hyogo Japan Master Program of Innovation for Design and Eng. Advanced Institute of Industrial Technology Tokyo Japan

The conventional robot arms applied in various fields are demanded to have high force output, high accuracy, high efficiency. But they are seldom applied in human life, because of large weight, rigidity, hazards to people caused by collisions. Therefore the soft robotic arm that is stretchable, light weight, softness without possible of hazards, and high precision control is suitable to deploy in human life. Thus the purpose of this research is to develop the soft robotic arm by using antagonistic pneumatic driven system. In order to realize this concept, the joint activation mechanism is the key component. This study focuses on the angle control of the joint. In this paper, the robot arm made by polyethylene is proposed. Air bags made of polyethylene inside the joint achieve antagonistic driven states. Helical tube made of polyethylene is adhered joint outside for realizing rigidity. It is characterized that control rigidity is realized by controlling the pressure in the helical tube and joint angle is preciously controlled in two degree of freedom by controlling pressure in the air bags. Furthermore, the joint angle can be controlled by controlling the air pressures in the air bags using stretch sensor measuring joint angle. The experimental result confirmed that the driving concept of the joint was well functioned, and the joint angle control was realized by feedback control.

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Catalytic effect of Titanium Dioxide (TiO2) on the kinetic and thermodynamic parameters of Tetraselmis chuii microalgae during the pyrolysis

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Journal of Physics: Conference Series 2020年第1期1595卷

作者： A E Widiono S Sukarni R Wulandari P Puspitasari A A Permanasari A Prasetiyo Master Program of Mechanical Engineering Graduate School Universitas Negeri Malang Jl. Semarang 5 Malang 65145 Indonesia Center for Renewable and Sustainable Energy Engineering (CRSEE) Department of Mechanical Engineering Universitas Negeri Malang Jl. Semarang 5 Malang 65145 Indonesia Centre of Advanced Materials for Renewable Energy (CAMRY) Universitas Negeri Malang Jl. Semarang No 5 Malang 65145 Indonesia

The catalytic effect of TiO2 during the pyrolysis of Tetraselmis chuii (***) microalgae was studied using a thermal analyzer. Pyrolysis experiment was occupied on the sample that was a mixture of 10 mg microalgae and 5% TiO2 and the result was compared with microalgae and microalgae with 3% TiO2. The presence of 5% TiO2 into the microalgae affected decreasing the initial and final temperatures of degradation by approximately 17 °C (at Stage 2) and 35 °C (at Stage 3) respectively. The activation energy that was evaluated using the Coats-Redfern method for Stage 2 indicated the decreasing value of around 18.39 kJ/mol and increases in Stage 3 by 3.27 kJ/mol. The overall results indicated that addition of TiO2 has significantly influenced the conversion process of T. chuii microalgae.

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Grain Size Effect on Saddle Phenomenon in V-Bending Process of Thin Sheet Metal

Grain Size Effect on Saddle Phenomenon in V-Bending Process ...

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The Third International Conference on Applied engineering,Materials and Mechanics(ICAEMM 2018)

作者： Chang-Cheng Chen Yi-Xiang Hong Department of Mechanical Engineering Taipei City University of Science and Technology Master Program of Mechatronics Taipei City University of Science and Technology

The ability to predict springback on sheet metal bending processes is like an important feature of the ability to predict the final geometry of sheet metal parts. The grain size effect makes the application of traditional design method difficult in processing. Understanding the effects of grain size effects is an important and powerful way to effectively compensate for and eliminate springback as it passes through tool and process design. In this paper, 99.5% pure iron specimens were heat treated at different temperature to obtain the specified grain sizes. The effects of different grain sizes on the saddle after Vbending of the thin sheet metal were investigated. The results show that at the same thickness of specimens,the grain size has no significant effect on the saddle height. However, with the increase of the thickness of the specimens, the saddle will also be more prominent protruding height.

关键词： Grain Size Effect on Saddle Phenomenon in V-Bending Process of Thin Sheet Metal

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Consumption, power number, and power curve characteristic of water diesel fuel emulsion mixer

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AIP Conference Proceedings 2020年第1期2296卷

作者： Agus Sartomo Budi Santoso Ubaidillah 1Master Program of Mechanical Engineering department Sebelas Maret University Jl. Ir. Sutami Kentingan Surakarta Indonesia 3Agency for The Assessment and Application of Technology Puspiptek Serpong South Tangerang Banten Indonesia 2Mechanical Engineering Department Sebelas Maret University Jl. Ir. Sutami Kentingan Surakarta Indonesia

Investigations have been done on the consumption of electric power in the process of water-diesel fuel emulsion mixing. The mixing process has been carried out using a mixer equipped with a 4-blade impeller. The mixer and impeller are made of aluminum material, while the impeller shaft is made of stainless steel. The mixer has a cylindrical tube shape and has a volume of 450 ml. Emulsion fuels consist of 85%v diesel fuel and 15%v water. This emulsion fuel has a density property of 858.8 kg/m3 and a dynamic viscosity of 0.0547 Pa.s. The mixing process was carried out at 2,000 rpm mixing speed up to 8,000 rpm at 1,000 rpm intervals. The mixer is connected to an electric motor and inverter, so the mixing speed of the mixer can be adjusted. In this research, data of electric current and electrical voltage are taken at each variation of mixing speed. The experimental data show that the higher the mixing speed, the higher the electric current needed. Thus, electricity consumption also is higher. The highest electrical power consumption is at 8,000 rpm mixer speed, while the lowest power consumption is at 2,000 rpm rotation. Non- dimensional power number (Np) analysis was also carried out in this study. By calculating the Reynold number (Re) and the electric power consumption at each rotation of the mixer, the power number curve (Np) is obtained. This curve is used to predict the power consumption of a mixer with the same impeller shape.

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Influence of Carrageenan on the mechanical Strength of Starch Bioplastic Formed by Extrusion Process

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IOP Conference Series: Materials Science and engineering 2019年第1期494卷

作者： H Suryanto AW Rahmawan Solichin RT Sahana M Muhajir U Yanuhar Master Program of Mechanical Engineering Graduate School Universitas Negeri Malang Indonesia Faculty of Fisheries and Marine Science University of Brawijaya Malang Indonesia Department of Mechanical Engineering Faculty of Engineering Universitas Negeri Malang Indonesia

The waste of synthetic plastic was the critical environmental problems so the biodegradable plastic is a viable remedy to solve this problem. Addition of biopolymer into bioplastic as the blend could provide a synergistic effect that influences their properties. This study aim was to show the influence of carrageenan on the mechanical properties of bioplastic cassava starch obtained through the extrusion process. This experimental research involved varies concentrations of carrageenan i.e. 0%, 2.5%, 5%, 7.5%, and 10%. The extrusion process was conducted in a single screw extrusion at 120° C. The extruded bioplastic was characterized by a tensile test and observed using the Scanning Electron Microscope (SEM). The bioplastic starch/carrageenan blend had the tensile strength of 1,1 MPa, 1.62 MPa, 4.87 MPa, 2.137 MPa, and 2.876 MPa and elongation of 28.69%, 20.22%, 19.48%, 17.27%, and 14.78% at carrageenan addition of 0%, 2.5%, 5%, 7.5%, and 10%, respectively.

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