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All Journal Infotekmesin Prosiding Seminar Nasional Teknik Mesin MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Jurnal Mekanik Terapan Mitra Akademia: Jurnal Pengabdian Masyarakat JURNAL POLI-TEKNOLOGI
Candra Damis Widiawaty, Candra Damis
Politeknik Negeri Jakarta
Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation

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KAJIAN ANALISIS ENGINEERING DENGAN METODE COMPUTATIONAL FLUID DYNAMICS Candra Damis Widiawaty; Ahmad Indra Siswantara; Gun Gun R Gunadi
Jurnal Poli-Teknologi Vol. 14 No. 3 (2015)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v14i3.763

Abstract

ABSTRACT Computational fluid dynamic is fluid flow analysis in spesific system by mean of computer based simulation. The use of CFD to predict fluid flow in characteristic system which has specified conditions. The purpose of this research is to describe the procedural of simulation. The scope of this research is to verify the calculation result with the simulation result. The method of this research are iteratif calculaation and simulation. The result of iteratif calculation water outlet temperatur is of 71,88oC, while the simulation result for S1 is of 62,58 oC, S2 is of 79,44 oC, S3 is of 71,02oC, and S4 is of 71,68 oC. The difference of the result cause by the dimension of diameter tube, type of flow, and distribution of grid. The result of this research show that the accuration of simulation is depend on the intial engineering thingking, grid, and fluid flow specification. Key words: CFD, fluid, grid, simulation ABSTRAK Computational Fluid Dynamics (CFD) adalah pemanfaatan komputer untuk menghasilkan informasi tentang bagaimana fluida mengalir pada kondisi tertentu. CFD digunakan untuk membuat prediksi aliran fluida di dalam suatu sistem tertentu pada suatu kondisi yang ditentukan. Penelitian ini bertujuan mendeskripsikan langkah simulasi yang tepat. Lingkup penelitian ini adalah membandingkan hasil kalkulasi dengan hasil simulasi. Metode penelitian ini adalah kalkulasi iteratif dan simulasi. Hasil kalkulasi adalah temperatur keluaran air sebesar 71,88oC sedangkan dengan simulasi sebagai berikut parameter S1 sebesar 62,58 oC, S2 sebesar 79,44 oC, S3 sebesar 71,02oC, dan S4 sebesar 71,68 oC. Berbedaan hasil simulasi berurut-urut disebabkan oleh diameter tube, perbedaan tipe aliran, dan perbedaan distribusi grid. Hasil penelitian ini menunjukkan bahwa perancangan dengan software CFD sangat dipengaruhi oleh pemahaman pengguna terhadap sistem yang akan disimulasikan, pembangkitan grid/mesh, dan spesifikasi aliran. Kata kunci: CFD, fluida, grid, simulasi
PEMODELAN DAN ANALISIS KINERJA SHELL AND TUBE HEAT EXCHANGER DENGAN METODE CFD Candra Damis Widiawaty; Gun Gun Ramdlan Gunadi; Adi Syuriadi
Jurnal Poli-Teknologi Vol. 16 No. 3 (2017)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v16i3.979

Abstract

ABSTRACTOne of the problem that faces by local heat exchanger manufactur is testing the heat performance test, because of customized product and facilities. It could be solved by CFD Method.The purpose of this study is to describe the actual prosedure to simulate and analysis thermofluid ini shell and tube system. The procesure of this research are survey, calculating the heat performance test based on general concept of heat transfer, and verify the simulation result.The CFD method results the temperatur of water inlet is 30 oC, water outlet 31 oC, oil inlet 55 oC, and oli outlet 53 oC. The manual calculation based on Kern method results the temperatur of water inlet is 30 oC, water outlet 31 oC, oil inlet 55 oC, and oli outlet 52 oC.Keywords: Shell and tube heat exchanger,CFD , Kern MethodABSTRAKSalah satu kendala manufaktur lokal heat exchanger (HE) adalah tidak dapat melakukan performance test perpindahan panas, karena keterbatasan fasilitas. Kendala ini dapat diatasi dengan metode CFD.Penelitian ini bertujuan untuk memberikan solusi simulasi dan analisis termofluida pada sistem shell and tube heat exchanger (STHE). Metode penelitian yang digunakan adalah simulasi berbasis CFD. Proses penelitian dimulai dari pengambilan data di manufaktur lokal STHE, perhitungan kinerja berdasarkan persamaan umum perpindahan panas, simulasi dan analisis kinerja STHE.Perhitungan simulasi menunjukkan temperatur di inlet air sebesar 30oC, temperatur outlet air sebesar 31oC, temperatur inlet oli 55 oC dan temperatur outlet oli 53 oC. Perhitungan metode Kern menghasilkan temperatur di inlet air sebesar 30oC, temperatur outlet air sebesar 31oC, temperatur inlet oli 55 oC dan temperatur outlet oli 52 oC.Kata Kunci : Shell and tube heat exchanger,CFD , metode Kern
MODIFIKASI BUCKET ELEVATOR 536 PADA PT X Candra Damis Widiawaty; Averoes Syahputra Agil; Bayu Chandra Hangesthi
Jurnal Poli-Teknologi Vol. 18 No. 3 (2019)
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/pt.v18i3.2393

Abstract

In the production process at PT X, such as casting process, required raw material in the form of casting sand. The sand transport process is done by a machine called a Bucket Elevator. The current condition of Bucket Elevator at Plant 2 PT X had some problems on its design due to the initial modification process to the machine that were deliberately done in order to ease the process of troubleshooting and repair on the machine to adjust the height of the drum shaft supported by the bearing, however, the modification causes a sand leak that impacted the lifetime of the bearing. The damage that occurs to the bearing of the Bucket Elevator can slow the production process at PT X down, which lasts between 120 hours to 134 hours per week. Therefore, it is necessary to modify the design of the Bucket Elevator machine in order to stop the sand leakage and be able to work optimally. The design modifications made, are changes to the shaft height adjusting mechanism of the Bucket Elevator 536 drum machine by providing a lock to minimize the leakage of sand that occurs and replace the bearing type to the type that is equipped with a seal to prevent the entry of sand into the bearings. The result of this modification can extend the lifetime bearing, thereby reducing production costs due to bearing replacement, and easing the troubleshooting and repairing process of the engine to adjust the height of the drum shaft supported by the bearings.
An Investigation into the Impact of Elbow Angle, Flow Rate, and Flywheel Diameter on the Performance of a Micro Hydroelectric Power Plant (PLTMH) Prototype Widiawaty, Candra Damis; Saputra, Yuli Mafendro Dedet Eka; Santoso, Budi; Gunadi, Gun Gun Ramdlan; Sumadipraja, Berlian Firdaus; Yuliana, Arifia Eka; Can, Ahlul Haq; Handaru, Fathir Zuhayr; Khairunisa, Nabila Lufky
MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Vol 6 No 3 (2024): Motivection : Journal of Mechanical, Electrical and Industrial Engineering
Publisher : Indonesian Mechanical Electrical and Industrial Research Society (IMEIRS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46574/motivection.v6i3.383

Abstract

The Micro Hydroelectric Power Plant Simulator (MHP) serves as a teaching tool to understand the principles and factors influencing electrical power output. While previous studies have examined the impact of turbine types, elbow angles, and flow rates, limited research has focused on the effect of flywheel diameter. The flywheel diameter influences the torque generated for generator rotation. This study, conducted on the MHP simulator at the Energy Laboratory of Jakarta State Polytechnic, explores the effects of variations in elbow angle, flow rate, and flywheel diameter on electrical power output. Experimental results reveal that these parameters significantly impact power generation. Notably, in case 1, with a 45° elbow angle, a flow rate of 7 L/s, and a 30 cm flywheel diameter, the system produces the highest output of 63 W. These findings underscore the importance of flywheel diameter in optimizing micro-hydropower system efficiency, offering insights for future plant design, especially in water-scarce regions. Simulator Pembangkit Listrik Tenaga Mikro Hidro (PLTMH) digunakan sebagai alat pembelajaran untuk memahami prinsip dan faktor yang mempengaruhi keluaran daya listrik. Meskipun penelitian sebelumnya telah mengkaji pengaruh jenis turbin, sudut siku-siku, dan debit aliran, penelitian tentang pengaruh diameter flywheel masih terbatas. Diameter flywheel mempengaruhi torsi yang dihasilkan untuk memutar generator. Penelitian ini dilakukan pada simulator PLTMH di Laboratorium Energi Politeknik Negeri Jakarta untuk menguji pengaruh variasi sudut siku-siku, debit aliran, dan diameter flywheel terhadap keluaran daya listrik. Hasil eksperimen menunjukkan bahwa ketiga parameter tersebut mempengaruhi secara signifikan pembangkit daya listrik. Pada kasus 1, dengan sudut siku-siku 45°, debit aliran 7 L/s, dan diameter flywheel 30 cm, dihasilkan daya tertinggi sebesar 63 W. Temuan ini menekankan pentingnya diameter flywheel dalam mengoptimalkan efisiensi sistem mikro-hidro, yang dapat menjadi acuan perancangan pembangkit mikro-hidro di daerah dengan sumber daya air terbatas.
Pengembangan Model Pembangkit Listrik Tenaga Picohydro Tipe Turbin Cross Flow Head Rendah Gun Gun R Gunadi; Jusafwar; Candra Damis Widiawaty; Machfud Priyo Utomo; Ramdana Ajie Satria; Muhammad Raihan Abimanyu; Adi Syuriadi; Dianta Mustofa Kamal; Rosidi
Infotekmesin Vol 13 No 2 (2022): Infotekmesin: Juli, 2022
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v13i2.1527

Abstract

The provision of food, energy supply, and the provision of information are The food provision, energy supply, and information delivery are controlled to improve people's welfare. In 2011, the national electricity production by PLN was 11% new and renewable energy. 6% hydropower and 5% geothermal. PLN plans the geothermal to be 13% and hydropower to be 6%. The availability of independent PhPP has been built by many communities. PhPP with a waterwheel drive provides a capacity of about 100 watts thus it is only enough for home lighting, whereas the hydro energy potential of the area is quite abundant. The development that has been carried out has several weaknesses; PhPP plump turbine type requires a high head which becomes a constraint for agricultural irrigation, in the other hand PhPP waterwheel type has low efficiency. The research was conducted to develop PhPP low head cross-flow turbine type, which is more efficient. The development begins with the experiment of the PhPP cross-flow turbine model to optimize the ratio of the diameter and width of the runner. A preliminary case study provides experimental results for a cross-flow turbine's torque and power parameters at a flow rate of 0.053 m3/s. Changes in the turbine diameter and width ratio are optimum at a runner width of 10 cm.
Co-Authors Abadi, Cecep Slamet Abi Tonjo Buono Adi Syuriadi Adi Syuriadi Adi Syuriadi Agustiant, Muhammad Brahmana Ahmad Indra Siswantara Akhmad Fauzi Ali, Jauhari Ali, Jauhari Auliya, Nurul Averoes Syahputra Agil Bahar UDIN Bayu Chandra Hangesthi Buono, Abi Tonjo Can, Ahlul Haq Cecep Slamet Abadi Dianta Mustofa Kamal Dwi Budi Santoso Emir Ridwan, Emir Fachruddin Fachruddin Gun Gun R Gunadi Gun Gun R Gunadi Gun Gun R Gunadi Gun Gun Ramdlan Gunadi Gunadi, Gun Gun Ramdlan Hamdi Hamdi Handaru, Fathir Zuhayr Jusafwar Jusafwar Kamal, Dianta Mustofa Khairunisa, Nabila Lufky Machfud Priyo Utomo Machfud Priyo Utomo Muhammad Raihan Abimanyu Muhammad Raihan Abimanyu Priyonggo, Hari Agung Rahman, Haolia Ramdana Ajie Satria Ramdana Ajie Satria RATNA KHOIRUNNISA Rosidi Rosidi Shomami, Amalina Sidiq Ruswanto Sumadipraja, Berlian Firdaus Wijanarko, Rahman Andre Yuli Mafendro Dedet Eka Saputra Yuliana, Arifia Eka