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All Journal MESIN International Journal of Electrical, Energy and Power System Engineering (IJEEPSE) Jurnal Penelitian dan Karya Ilmiah Lembaga Penelitian Universitas Trisakti
Rosyida Permatasari, Rosyida
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Penentuan Persamaan Distribusi Temperatur Udara Dalam Ruang Annulus Pada Daerah Sub-Layer Laminar Dengan Metoda Regresi Permatasari, Rosyida; Riyono, Joko
MESIN Vol 9, No 3 (2007): Ocean Thermal Energy Conversion (OTEC) untuk "Pulau-pulau Kecil"
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Abstract

Determination of Air Temperature Distribution Equation in Annulus Room on LaminarSub Layer Theretorey. Laminar sub-layer is a very thin region near the wall has a laminar character andthe viscous action and heat transfer take place under circumstances like those in laminarflow. ^ Havingobtained a knowledge of the temperature distribution, the heat transfer rate from a heated surface to afluid which isforced over it may be determined. The temperature distribution is obtained by leastsquaremethod. Andthe observation data is closed by exponentialregression equation.
Pengaruh Penambahan Zat Aditif X terhadap Viskositas, Performa Mesin dan Emisi Gas Buang Sepeda Motor Honda CB150R Senoadi, Senoadi; Adi, Supri; Permatasari, Rosyida
MESIN Vol 10, No 1 (2019): Optimization in Renewable-Energy Conversion and Mechanical Design for National
Publisher : Universitas Trisakti

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Abstract

Mechanical contact is the process which can not be avoided in machinery system. The way to diminish thrist conditon which caused by the process is to give engine lubricant into that system. The lubricant resistance over the temperature system is influenced by base stock and its additives where contained of. Lubricant oil additives are chemical compounds that will improve or enhance the lubricant performance of base oil. These additives are carefully designed to ensure the functions in machines system. Engine lubricant that used in this research is MPX 1 SAE 10 W-30 and the additives that used is Engine Additive with brand Lupromax. The aim of this research is to analyze the reaction of increasing the additive EA over to viscosity and machine function of Honda All New CB 150R. In this research, it is found that the fusion with EA 5.25% (1200 ml lubricant with 63 ml additives) could: (1) reduce viscosity to 66.56 mm2/s and 9.9 mm2/s at temperatures of 40°C and 100°C, respectively, (2) enhance the torque and energy to 14.5 kW @9000 rpm and 12.23 Nm @7000 rpm with reducing the rate emision of CO to 0.44% vol, HC to 196 ppm vol, CO2 to 6.5% vol and enhancing the rate of O2 to 10.71%, and (3) reduce fuel consumption to 18.75 ml/km.
Perancangan dan Pemodelan Turbin Darrieus untuk Pembangkit Listrik Tenaga Arus Laut (PLTAL) Prayoga, Wahyu Adi; Permatasari, Rosyida
MESIN Vol 10, No 1 (2019): Optimization in Renewable-Energy Conversion and Mechanical Design for National
Publisher : Universitas Trisakti

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Abstract

Sea current energy is one of the new and renewable energy that is currently being developed to replace fossil energy which is starting to deplate its availability. Sea current energy research continues to be developed. One of the studies that can be developed is modeling laboratory-scale sea currents, so that it is necessary to design a model of Sea Current Power Plants that aims to improve the process of understanding the energy. In this design, a model of Sea Current Power Plant with a capacity of 150 Watt is designed using the Darrieus Turbine. The design results some data such as : diameter of 428 mm for turbine rotor, height of 327 mm for turbine rotor, chord length of 0.04 m for 3 NACA 0018 airfoil blades, and a transmission ratio of 1 : 5 for transmission systems using a straight gear gearbox. In addition, the turbine generated 205.5 rpm rotation at  flow rate of 1.15 m/s with turbine efficiency of 40%.
Pengaruh Perbedaan Tegangan Pemanas terhadap Performa Refrigeran R12, R134a dan MC134 pada Refrigeration Laboratory Unit Senoadi, Senoadi; Aliandi, Arif Akhmad; Permatasari, Rosyida
MESIN Vol 10, No 1 (2019): Optimization in Renewable-Energy Conversion and Mechanical Design for National
Publisher : Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/ms.v10i1.4128

Abstract

Along with technological developments and population growth, the need for air conditioner (AC) is increasing, both those used in industry, offices, buildings, housing, vehicles, and others. In the use of AC, refrigerant is needed. Based on the Montreal agreement, it was agreed to replace refrigerants that are more environmentally friendly. The refrigerant used today is refrigerant with CFC and HCFC compounds. The use of those refrigerants result in ODP and GWP. This study aims to determine the energy efficiency of three refrigerants: R12, R134a, and MC134, by comparing the COP value of a refrigeration laboratory unit machine. Based on the test results, COP of MC134 refrigerant has the highest value compared to R12 and R134a refrigerants. Therefore, it can be concluded that MC134, a hydrocarbon refrigerant, could be considered as a substitute for R12 and R134 refrigerants, eventhough  flammability of the  hydrocarbons at certain temperatures should be considered also.
Effect of Evaporator Outflow Rate on Air Distribution in the Computer Laboratory using CFD Permatasari, Rosyida; Bambang Susetyarto, Martinus
International Journal of Electrical, Energy and Power System Engineering Vol. 3 No. 3 (2020): International Journal of Electrical, Energy and Power System Engineering (IJEEP
Publisher : Electrical Engineering Department, Faculty of Engineering, Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/ijeepse.3.3.89-93

Abstract

The ideal room temperature will create comfort in the learning and teaching process. With increasing outdoor air temperature due to climate change, an air conditioner is needed to reach the ideal room temperature. An air conditioner is an air conditioner that is needed to regulate the temperature and humidity of the air in a room. The purpose of this study is to determine the airflow pattern produced by air conditioning equipment and to determine the distribution of air temperature in the computer laboratory room. Computational Fluid Dynamic (CFD) is a simulation method used by using the ANSYS application. Based on research conducted in a computer laboratory room which has a length of 12 m, a width of 12 m, a chamfer of 3.93 m and a height of 3 m, the airflow pattern produced by the air conditioner is relatively the same between the variable air velocity 2.5 m / s and 3 m / s. Where the air will move straight in accordance with the outlet shape of the air conditioner and then experience a decrease in speed over a certain distance and a change in the direction of air flow occurs due to exposure to room properties and eventually spreads throughout the room. The average temperature in the computer laboratory room for the variable air velocity 2.5 m/s is 24 ° C. Meanwhile, the variable air velocity 3 m/s 23 ° C.
Determining Position of the Evaporator in a Smart Classroom Concept Using CFD Method Permatasari, Rosyida; Ridhoarto, Muhammad Alwan; Cahyati, Sally; Susetyarto, Martinus Bambang
International Journal of Electrical, Energy and Power System Engineering Vol. 4 No. 3 (2021): International Journal of Electrical, Energy and Power System Engineering (IJEEP
Publisher : Electrical Engineering Department, Faculty of Engineering, Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/ijeepse.4.3.178-184

Abstract

Various, different evaporator placements in a room have produced different airflow patterns, temperature distribution, and airflow velocities. In this study, the average room temperature and airflow velocity measured at 27 points of the CFD simulation for 4 positions of the planned evaporator placements were compared to determine the most ideal position based on the comfortable temperature and the maximum airflow velocity pursuant to the SNI 03-6572-2001 recommendation. On Position 1, two evaporators were given to the west wall. Position 2, two evaporators were placed on the south wall. On Position 3, two evaporators were given to the north wall. Moreover, on Position 4, two evaporators were placed opposite to each other where an evaporator was placed on the south wall, and the other evaporator was placed on the north wall. An ANSYS Fluent software was employed to make the CFD simulation. Based on the results of the study, it was found out that Position 2 was the most ideal evaporator placement position since it met the comfortable temperature limit and has the highest number of airflow velocity points meeting the recommended maximum airflow velocity pursuant to the SNI 03-6572-2001 recommendation.
Characteristic Tests of Bio-pellets Made of Calliandra Wood as a Renewable Alternative Fuel Permatasari, Rosyida; Muthia Atikayanti; Elisanti Sugitha Ginting
International Journal of Electrical, Energy and Power System Engineering Vol. 5 No. 2 (2022): International Journal of Electrical, Energy and Power System Engineering (IJEEP
Publisher : Electrical Engineering Department, Faculty of Engineering, Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/ijeepse.5.2.45-49

Abstract

Calliandra wood is a kind of forest biomass located in Baturaden Adventure Forest (BAF). The availability of which is quite abundant, so it has such an outsized potential to be processed into biopellets. This study was aimed at creating biopellets made of Calliandra wood and assessing their calorific value and their proximate value, and doing the mechanical and the combustion tests. This wood was converted into bio-pellets by employing several processes such as the drying, crushing, and milling processes, as well as the process of a 60-mesh sifting and the process of printing the bio-pellets with a starch adhesive of 16% Calliandra wood powder mass. Based on the results of this study, it was found out that the characteristics of the Calliandra wood biopellets taken from BAF had met the standards recommended by SNI 8021:2014, namely that of an over 4000 cal/gr calorific value, 3.6 % maximum moisture content, 69.4% maximum volatile matter content, 0.95% maximum ash content and 26% minimum fixed carbon content. The tests found out that the maximum stress value was 2.5MPa. and 66gram Calliandra wood bio-pellet could boil 500 ml of water in 6.5 minutes. Therefore, the biopellets can highly effectively be used as an alternative fuel.
Optimization Position Variable Refrigerant Flow In Building Using CFD Method Permatasari, Rosyida; Khairunisa , Riana
International Journal of Electrical, Energy and Power System Engineering Vol. 6 No. 1 (2023): The International Journal of Electrical, Energy and Power System Engineering (I
Publisher : Electrical Engineering Department, Faculty of Engineering, Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/ijeepse.6.1.126-132

Abstract

Variable refrigerant flow type is a multi-split type air conditioner for multi-story buildings. The aim of this study getting obtains optimization placement of the condensing unit to inlet air temperature in a multi-story building using the CFD method. The simulation was conducted from the 11th to the 30th floor. There are three variations of condensing unit position on each floor (Variation 1), on every two floors (Variation 2), and on the roof (variation 3). The result of the first variation is 35.32 °C, with the difference between the highest and lowest is 3.9 °C. The average temperature of the 2nd variation is 34.44 °C, with the difference between the highest and lowest being 0.92 °C. The average temperature of the 3rd variation is 36.65 °C, with the difference between the highest and lowest being 8.03 °C. Among the three variations, the 2nd variation of the condensing unit input air temperature is lower. Then the difference between the highest and lowest temperatures is not too far apart, indicating a more even distribution of air. The 1st, 2nd, and 3rd variations condensing unit position do not exceed Panasonic VRF air conditioner operational temperature limit, which is 52 °C.
Effect of Vortex Generators on Airfoil NACA 632-415 to Aerodynamic Characteristics Using CFD Permatasari, Rosyida; Widyawati, Gusty
International Journal of Electrical, Energy and Power System Engineering Vol. 6 No. 1 (2023): The International Journal of Electrical, Energy and Power System Engineering (I
Publisher : Electrical Engineering Department, Faculty of Engineering, Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/ijeepse.6.1.133-137

Abstract

To determine the aircraft’s flight performance, the airfoil type must be considered when designing the wing. A vortex can form when the airfoil travels through a fluid stream with a difference in velocity and pressure around it. Airfoil modification is carried out to delay the occurrence of flow separation by adding a vortex generator. This paper discusses how adding the vortex generator helps slow the stall’s onset and how the vortex generator affects the fluid flow and aerodynamic forces acting on the NACA 632-415. The vortex generator profile is positioned at an x/c = 20% of the chord line’s direction from the leading edge. The variation used is an airfoil’s angle of attack (α). Some parameters to be evaluated include the coefficient lift force (C­­L), the coefficient drag force (CD), and the gliding ratio (C­­L/CD). The research was conducted by the CFD method based on the angle of attack that produces the coefficient lift and drag forces. The addition of the vortex generator can delay the flow separation, increase the lift force coefficient by about 24.9%, the drag force coefficient by about 2.7%, and the gliding ratio by 9.1%.
PENGARUH DIAMETER BLADE TIPE LURUS TERHADAP EFISIENSI TURBIN VORTEKS MENGGUNAKAN METODE CFD Andriyan, Ari; Permatasari, Rosyida
JURNAL PENELITIAN DAN KARYA ILMIAH LEMBAGA PENELITIAN UNIVERSITAS TRISAKTI Volume 8, Nomor 1, Januari 2023
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/pdk.v8i1.14861

Abstract

Salah satu sistem yang digunakan oleh Pembangkit Listrik Tenaga Mikro Hidro adalah mikro hidro vorteks. Mikro hidro vorteks menggunakan energi kinetik air yang membentuk pusaran yang akan menggerakkan blade turbin. Faktor yang dapat ditinjau agar mendapatkan efisiensi turbin yang optimal adalah jenis ukuran pada blade. Tujuan penelitian ini adalah untuk mengetahui pengaruh diameter blade tipe lurus terhadap efisiensi turbin menggunakan metoda CFD. Tipe blade yang digunakan adalah tipe lurus dengan diameter 20cm, 25cm, dan 30cm. Performa turbin didapat menggunakan metode Computational Fluid Dynamics (CFD) dengan simulasi software ANSYS Fluent. Hasil simulasi yang diperoleh adalah nilai performa tertinggi dari  turbin vorteks terjadi pada uji parameter blade ukuran 30cm dengan nilai daya 775Watt, nilai putaran turbin 847rpm, nilai kecepatan sudut () pada 88,7rad/s, nilai torsi pada 8,51J, dan nilai efisiensi mencapai angka 73%.   ABSTRACT  One of the systems used by the Micro Hydro Power Plant is the micro hydro vortex. Micro hydro vortex uses the kinetic energy of water to form a vortex that will drive the turbine blades. Factors that can be reviewed in order to obtain optimal turbine efficiency is the type of blade size. The purpose of this study was to determine the effect of straight type blade diameter on turbine efficiency using the CFD method. The type of blade used is a straight type with a diameter of 20cm, 25cm, and 30cm. Turbine performance is obtained using the Computational Fluid Dynamics (CFD) method with ANSYS Fluent software simulation. The simulation results obtained are the highest performance value of the vortex turbine occurs in the 30cm blade parameter test with a power value of 775Watt, turbine rotation value 847rpm, angular velocity () value at 88.7rad/s, torque value at 8.51J, and efficiency reaches 73%.
Co-Authors Adi, Supri Aliandi, Arif Akhmad Andriyan, Ari Annas, Muhammad Sjahrul Christina Eni, Christina Elisanti Sugitha Ginting Feliks Handrianus, Feliks Gusti Yuditia Rahmadian, Gusti Yuditia Joko Riyono Khairunisa , Riana Metheny, Boris Muthia Atikayanti Prayoga, Wahyu Adi Ridhoarto, Muhammad Alwan Sally Cahyati Senoadi Senoadi, Senoadi Susetyarto, Martinus Bambang Widyawati, Gusty