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All Journal Buletin Udayana Mengabdi Jurnal Energi Dan Manufaktur TEKNIK FLYWHEEL : Jurnal Teknik Mesin Untirta Jurnal METTEK (Jurnal Ilmiah Nasional Dalam Bidang Ilmu Teknik Mesin) Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin Natural Sciences Engineering and Technology Journal
I Gusti Ketut Sukadana
Program Studi Teknik Mesin. Fakultas Teknik, Universitas Udayana
Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Neuroscience Physics Social Sciences Transportation

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Simulasi CFD Pertukaran Udara di Ruang Tindakan Klinik Kesehatan I Putu Widiarta; Made Suarda; Made Sucipta; I Gusti Ketut Sukadana
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 8 No 2 (2022)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/METTEK.2022.v08.i02.p03

Abstract

Klinik kesehatan merupakan fasilitas pelayanan kesehatan. Klinik kesehatan adalah bangunan yang penuh dengan sumber infeksi, terutama infeksi melalui udara. Pengendalian infeksi virus melalui udara dapat dilakukan dengan kontrol engineering yaitu dengan penambahan sistem ventilasi dan untuk mencapai kenyamanan termal ruangan maka dibutuhkan sistem pengkondisian udara. Penambahan sistem ventilasi mekanis berupa exhaust fan dan inflow membuat adanya sirkulasi udara dimana udara segar dimasukan melalui saluran inflow dan udara kotor dikeluarkan melalui saluran exhaust fan sehingga resiko penularan virus melalui udara dapat diminimalkan. Pola aliran dari sirkulasi udara penting dilakukan analisis karena agen infeksius yang ringan cendrung mengikuti pola aliran. Untuk mengetahui pola aliran dan pengaruh dari jumlah exhaust fan serta sudut flapper AC dilakukan dengan metode simulasi CFD (Computational Fluid Dynamics) serta dilakukan pengujian secara eksperimen yaitu pengukuran tekanan dan temperatur serta kelembaban udara relatif. Variasi sudut flapper AC pada pengujian tanpa penambahan sistem ventilasi memberikan pengaruh terhadap input aliran sehingga titik-titik vortex terjadi pada posisi yang berbeda-beda. Sedangkan sudut flapper AC pada penambahan sistem ventilasi tidak dominan memberikan pengaruh terhadap pembentukan pola aliran. Penambahan inflow dan exhaust fan menunjukan terjadi superposition flow. Sedangkan variasi jumlah exhaust fan menunjukan semakin banyak jumlah exhaust fan maka kecepatan aliran udara diruangan menjadi meningkat dan tekanan udara ruangan menurun serta sirkulasi aliran dalam ruangan menjadi lebih merata. The health clinic is facilities of health service. A health clinic is building fully on the infection source, especially airborne infection. The spread of virus control from the air can perform by engineering control such as added mechanical ventilation system and to reach the thermal comfort, a system of air conditioning is needed. In addition, a mechanical ventilation system that is an exhaust fan dan inflow can create the air circulation where fresh air enters through inflow channels and dirty air goes out through exhaust fan channels, so the risk of airborne infection can be reduced. The airflow pattern from air circulation is important for analysis because infectious agents which are light in weight that tend to follow the airflow pattern. To find out the airflow pattern and influence from variations of the number of exhaust fans as well as the angle of the AC flapper, it is done using the CFD (Computational Fluid Dynamics) simulation method and carried out experimental tests, namely the measurement of pressure and temperature. The angle of the AC flapper tested without added ventilation system influenced the input of stream from AC blower then, the position of vortex had indifference location. While the angle of the AC flapper tested with the additional mechanical ventilation system did not influence airflow pattern formation. Added inflow dan exhaust fan showed the occurrence of the superposition flow. While the more of the number exhaust fans shows, the velocity of air in the room increases and the indoor pressure is decreasing as well as the air circulation in the room becomes more equally.
The Effect of Types of Biogas and Methanol Purification and Loading as Fuel for Four-Stroke Generators on Exhaust Emissions I Wayan Angga Widianta Putra; I Gusti Ketut Sukadana; I Gusti Ngurah Putu Tenaya; I Putu Widiarta
Natural Sciences Engineering and Technology Journal Vol. 3 No. 2 (2023): Natural Sciences Engineering and Technology Journal
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/nasetjournal.v3i2.37

Abstract

Biogas is a type of new renewable energy that is formed through the fermentation process of organic waste materials, such as livestock manure, organic waste, and other materials by methanogenic bacteria in anaerobic (without oxygen) conditions. Methanol is a very light, volatile, colorless, tasteless, flammable, toxic liquid with a very faint odour. In addition, methanol can be used as a solvent and also as an alternative fuel. This study aimed to determine the effect of the type of biogas and methanol purification and loading as fuel for a 4-stroke generator on exhaust emissions. An experimental study to test the efficacy of biogas and methanol fuels with or without loading with RON-90 gasoline (Pertalite®). The percentage of carbon monoxide (CO) and hydrocarbon (HC) emissions is used as a reference in assessing the efficacy of fuels in reducing emissions. The results of exhaust emission test studies using biogas purified from H2S, H2O, CO2, and methanol produce exhaust emission values of HC and CO with a lower value compared to the maximum value of the threshold according to the standards of the Minister of Environment Number 05 of 2006 so that biogas purified from H2S, H2O, CO2, and methanol is more environmentally friendly than RON-90 gasoline on the market.
Sifat Kekuatan Tarik dari Sambungan Tunggal Komposit Anyaman Serat Jute-Polypropylene dengan Metode Resistance Welding Ni Wayan Sugiarti; Mathias Noviantoro; I Gusti Ketut Sukadana; I Dewa Gede Ary Subagia
TEKNIK Vol. 44, No. 1 (2023): May 2023
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v44i1.41131

Abstract

Makalah ini menyampaikan hasil penelitian kekuatan tarik sambungan resistance welding (RW) dari komposit berbasis anyaman serat jute matrik polypropylene (JFRP). Metode RW dilakukan menggunakan pengaliran arus listrik pada kawat nikelin. Pada proses pengelasan untuk kawat nikelin adalah divariasikan yaitu ukuran diameter 0,3 mm dan 0,5 mm. Tujuan penelitian untuk menyelidiki kekuatan sambungan menggunakan metode RW menurut variasi diameter kawat nikelin. Pada pengujian masing-masing sampel diujikan sebanyak 5 kali pengulangan yang didasarkan pada standar ASTM D 638. Pengujian tarik dilakukan pada Universal Testing Machine (UTM) dengan cross head speed 3 mm/min, dan load cell 5 kN. Hasil penelitian menunjukkan bahwa JFRP dalam sambungan lapisan tunggal yang diikat dengan kawat nikelin berdiameter 0,5mm memiliki kekuatan tarik tertinggi dibandingkan dengan kawat nikelin berdiameter 0,3mm masing-masing adalah 213,58±0,05 MPa dan 210,34±0,05 MPa. Sementara itu, Modulus Young dari sambungan lapisan tunggal JFRP dengan diameter kawat nikelin berdiameter 0,3 mm memiliki nilai lebih tinggi dari kawat nikelin dengan diameter 0,5mm masing-masing adalah 8,16±0,05 GPa dan 8,44±0,05 GPa. Kemudian, regangan patah dari JFRP memiliki nilai yang sama 4% untuk kedua model sambungan. Kesimpulan menunjukkan bahwa pengelasan resistensi cukup menjanjikan untuk mengikat komposit termoplastik. Selain itu, diameter kawat nikelin adalah faktor penting yang mempengaruhi sifat mekanis sambungan.
Design Simulation of Micro-Grid Hybrid Solar Power Plant as a Power Supply Marcel Bonifacio Tirta Wijata; Anak Agung Adhi Suryawan; Ketut Astawa; I Gusti Ketut Sukadana; I Made Parwata
Natural Sciences Engineering and Technology Journal Vol. 3 No. 2 (2023): Natural Sciences Engineering and Technology Journal
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/nasetjournal.v3i2.40

Abstract

Photovoltaic system (PV system) has enormous potential in Indonesia, especially in Java-Bali, which accounts for 70% of Indonesia's electricity needs. In this study, a simulation of the PV system design was carried out using a hybrid microgrid as a power supply using PVsyst software to simulate PV system performance. Power load requirements are adjusted to the specifications of electric vehicles. Meteonorm meteorological data were compared with field data to adjust for data variability. In the design simulation, there are three different slope angle scenarios, namely 10º, 13º, and 15º. The effective surface area for installing PV system on an unmeasured roof is 35 m x 14 m (490 m2), so the number of modules that can be installed will be adjusted to the roof area. The PV system is capable of producing 169.3 MWh of power per year with an optimal tilt angle of 13º which has specific production of 1726 kWh/kWp/year and a performance ratio of 78.63%. In conclusion, PV system is able to supply the power needs of 103 units of electric vehicles every day.
The Use of Arak Bali as a Fuel Influence on Fire Characteristics of Combustion Sukadana, I Gusti Ketut; I Gusti Komang Dwijana; I Putu Widiarta
Natural Sciences Engineering and Technology Journal Vol. 4 No. 1 (2024): Natural Sciences Engineering and Technology Journal
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/nasetjournal.v4i1.44

Abstract

Analyze the characteristics of gas fuel from arak Bali, like shape and flame speed. Test characteristics such as methanol and ethanol content material gas from arak Bali, after it tested the gas fuel combustion characteristics of arak Bali such as the shape and speed of flame. Testing characteristics such as the content of methane and ethanol gas from arak Bali performed in the forensic laboratory while testing the ignition characteristics of the shape and speed of fuel from evaporating arak Bali done using a helle-shaw cell combustion chamber model. Air mixture ratio variations with gas fuel from arak Bali is 24/1, 25/1, 26/1, 27/1, 28/1, 29/1, 30/1 and 31/1. The observed effect is the shape and speed of the premixed flame propagation in the helle-shaw cell combustion chamber model. The results of the study, the moisture content of the basic ingredients of gas fuel arak Bali consisting of 40% methanol and 60% ethanol. Gas fuel from arak Bali has a stoichiometry air-fuel ratio of 30/1. Getting closer to the stoichiometry air-fuel ratio, flame color changes from reddish color faded to red, reddish blue, blue and bright blue last. The maximum speed of propagation of fire occurring in stoichiometry air-fuel ratio is 328.33 cm/sec.
CFD (Computational Fluid Dynamics) Simulation of Hydrodynamic Vortex Turbine Performance: Influence of Notch Angle Variation on Flow Patterns and Efficiency Sukadana, I Gusti Ketut; Made Suarda; I Putu Widiarta; Ishak Danus
Natural Sciences Engineering and Technology Journal Vol. 4 No. 2 (2024): Natural Sciences Engineering and Technology Journal
Publisher : HM Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37275/nasetjournal.v4i2.56

Abstract

Hydrodynamic vortex turbines (HVTs) offer a promising solution for harnessing renewable energy from low-head water sources. The inlet notch angle, a critical geometric parameter, significantly influences the flow patterns within the turbine basin and, consequently, its overall performance. This study investigates the impact of notch angle variation on HVT efficiency and flow characteristics using computational fluid dynamics (CFD) simulations. A 3D model of an HVT was developed and simulated using ANSYS Fluent. The notch angle was varied between 7° and 15° in 2° increments. The k-ω SST turbulence model was employed to capture the complex flow behavior. Velocity and pressure contours were analyzed to understand the flow patterns, while turbine performance metrics, including torque, power output, and efficiency, were computed. The results revealed a strong correlation between notch angle and turbine performance. Increasing the notch angle led to higher flow velocities in the turbine basin, resulting in enhanced vortex formation and increased energy extraction. Consequently, both power output and efficiency improved with larger notch angles. The optimal notch angle, balancing efficiency and practical considerations, was identified. This study demonstrates the critical role of notch angle in HVT design. CFD simulations provide valuable insights into the flow dynamics and performance optimization of these turbines. The findings contribute to the advancement of HVT technology for sustainable micro-hydro power generation.
Co-Authors AAIAS Komala Dewi Anak Agung Adhi Suryanwan Anak Agung Adhi Suryawan Anak Agung Adhi Suryawan I .G. P. Agus Suryawan I Dewa Gede Ary Subagia I Dewa Made Krishna Muku I Gede Kartana I Gusti Komang Dwijana I Gusti Komang Dwijana I Gusti Ngurah Bagus Surya Pratama I Gusti Ngurah Dwijana I Gusti Ngurah Priambadi I Gusti Ngurah Putu Tenaya I Ketut Adi Atmika I Made Astika I Made Dhanu Wijaya I Made Parwata I Putu Awing Wiratmana I Putu Widiarta I Putu Widiarta I Putu Widiarta I Wayan Angga Widianta Putra I Wayan Bandem Adnyana I.G.A.K.C. Adhi I.K.G. Wirawan Ishak Danus Ketut Astawa M.Pd S.T. S.Pd. I Gde Wawan Sudatha . Made Suarda Made Sucipta Marcel Bonifacio Tirta Wijata Mathias Noviantoro N.M.A.R. Adriani Ni Wayan Sugiarti Putu Lokantara