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Mesin
Published by Institut Teknologi Bandung
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Core Subject : Engineering,
Mechanical Engineering
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Articles 5 Documents
 1 
Search results for , issue "Vol 30 No 1 (2024)" : 5 Documents clear
A A COMPARATIVE REVIEW AND NOVEL DESIGN POSSIBILITIES ON SOLAR-DRIVEN ABSORPTION LIBR-H2O REFRIGERATION SYSTEM Gunawan, Sonix; Arfianto, Widi; Heryadi, Budi
Mesin Vol 30 No 1 (2024)
Publisher : Faculty of Mechanical and Aerospace Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2024.30.1.1

Abstract

Solar energy is a promising source of energy because of its potential due to the reduction usage of non-renewable energy. As the demand for cooling increases, solar-powered cooling technologies are becoming increasingly promising. Among the different solar cooling systems, LiBr-H2O absorption chillers are commonly used due to their advantages over NH3-H2O systems. Multiple cycle LiBr-H2O chillers can be powered by easily available flat-plate, evacuated tubular or parabolic solar collectors. This paper reviews Theoretical Principles-Based Analysis and Simulations of solar LiBr-H2O absorption cooling systems, performance comparison of each types and introduces new design options related to auxiliary energy systems and cooling mode cycle. The paper also summarizes other main types of solar absorption cooling systems, including double-effect, half-effect, triple effect and give updates of new technology design of hybrid effect. The choice of water-cooled or air-cooled absorption refrigeration depends on the local climate and water availability. Recent advances have made air-cooled absorption refrigeration a viable option, with comparable COP to water-cooled systems and lower maintenance requirements. Additionally, geothermal heat rejection with low pressure drops can further reduce energy consumption. Solar-powered double-effect absorption cooling systems are recommended for buildings with high cooling loads, while half-effect are suitable for air-cooled solar absorption cooling systems in hot and dry regions with limited water. This paper is specifically intended for those interested in developing solar-driven LiBr-H2O absorption chillers, emphasizing the importance of establishing standardized design guidelines to specific regions and climates in order to promote and expand the usage of solar cooling systems.
PENGEMBANGAN SISTEM AILERON PESAWAT TERBANG BERBASIS ELEKTROMEKANIK susilo, bangkit; Suwondo, Edy; Mulyanto, Taufiq
Mesin Vol 30 No 1 (2024)
Publisher : Faculty of Mechanical and Aerospace Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2024.30.1.2

Abstract

More Electric Aircraft (MEA) dan Zero Emission Aircraft (ZEA) adalah masa depan pengembangan pesawat terbang, hingga saat ini MEA dan ZEA belum mendapat sertifikasi tipe dari regulator kelaikan udara. Berdasarkan kondisi tersebut, pada penelitian ini akan dilakukan studi terkait penggunaan sistem elektromekanik pada  kendali aileron pesawat terbang. Penelitian ini  dimulai dengan memilih pesawat yang memenuhi regulasi Civil Aviation Safety Regulation (CASR) 23, yang kemudian sistem kendali aileron pesawat yang ada diganti dengan sistem berbasis elektromekanikal. Proses ini mencakup analisis kehandalan sistem menggunakan Fault Tree Analysis FTA. Kemudian analisis daya dan berat dilakukan untuk memastikan sistem yang baru dapat diterapkan. Pada akhir studi ini, didapatkan hasil analisis kegagalan sistem menunjukkan bahwa arsitektur  yang diusulkan memiliki tingkat kegagalan sekitar 9.324 × 10−8 pada kondisi loss of aileron control dan 1.09× 10−10  pada kondisi aileron hard over dan   hasil tersebut sudah memenuhi persyaratan regulasi. Analisis daya menunjukkan bahwa daya yang diperlukan hanya 1667,8 Watt, sehingga daya yang tersedia pada pesawat masih mencukupi. Namun, analisis berat menunjukkan bahwa sistem elektromekanikal yang baru lebih berat sekitar 35,7% dibandingkan sistem mekanikal yang digunakan sebelumnya.
ENHANCED IONIC CONDUCTIVITY OF LAYERED-MNO2 ACCOMPANIED MORPHOLOGY EVOLUTION FOR AQUEOUS ZINC-ION BATTERY Afiefudin, Mohamad; Setiawan, Asep Ridwan
Mesin Vol 30 No 1 (2024)
Publisher : Faculty of Mechanical and Aerospace Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2024.30.1.4

Abstract

Enhancing ionic conductivity is crucial for improving the performance of cathode materials in zinc-ion battery applications. In this study, nanoscale manipulation with nickel intercalation into the layered-MnO2 cathode structure was achieved through a hydrothermal reaction at 160°C for 10 hours. The results of Ni-layered-MnO2 synthesis showed a distinctive peak of layered-MnO2 cathode, as indicated by XRD results, and increased conductivity; its ionic conductivity was analyzed through electrochemical impedance spectroscopy (EIS), enabling rapid diffusion of Zn2+ ions and electron transfer. The distinctive morphology and structure of Ni-doped layered-MnO2 through scanning electron microscope (SEM) contribute to enhanced ionic conductivity and facilitate ion transportation, positioning it as a promising cathode material for aqueous zinc-ion battery applications.
ANALYSIS ON THE INFLUENCE OF DUCT CASING GEOMETRY ON THE PERFORMANCE OF A DUCTED FAN Pangaribuan, Marcellino; Hartono, Firman
Mesin Vol 30 No 1 (2024)
Publisher : Faculty of Mechanical and Aerospace Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2024.30.1.3

Abstract

This paper aims to evaluate the influence of an electric ducted fan’s (EDF) geometry on its performance through parameter correlation analysis. Sample data was first built by generating new EDF models with varying duct casing geometries through optimal space-filling (OSF) sampling method. Afterwards, each model was numerically solved with computational fluid dynamics (CFD) analysis to obtain each model’s thrust, required power, and efficiency. It is found that the casing’s inlet lip diameter displays the greatest influence on the EDF’s total thrust, as the inlet diameter determines the casing’s surface area affected by the low-pressure region ahead of the rotating fan blades. Additionally, it is found that length of the casing’s exhaust lip affects the EDF’s efficiency, while the exhaust lip diameter displays the highest correlation with the fan’s required power.
KAJI NUMERIK GROUND PAD SHOE KENDARAAN TEMPUR DENGAN MODEL MATERIAL HYPERELASTIC Rachmat, Angki Apriliandi; Dirgantara, Tatacipta; Suweca, I Wayan; Mardiyati, Yati
Mesin Vol 30 No 1 (2024)
Publisher : Faculty of Mechanical and Aerospace Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2024.30.1.5

Abstract

One of the important components on a combat vehicle is the ground pad shoe (GPS) or track pad. GPS that has been developed at this time mostly uses rubber material. Rubber raw materials themselves are found in Indonesia in large amount. Indonesia left 3 million tonnes of natural rubber unprocessed in 2018. On the other hand, natural rubber research is quite expensive and takes a long time to become a product. To make rubber products is needed special molds and tests. To solve the high costs and long time involved in rubber research, it is necessary to carry out numerical research. In this study, a numerical study of GPS rubber for combat vehicles was carried out with a hyperelastic material model. The research was conducted experimentally and numerically. Tensile testing is carried out on imported GPS samples which are then used as comparison data for numerical studies. The Mooney-Rivlin, Neo-Hookean, Yeoh, and Ogden hyperelastic models were varied to get the stress and strain values ​​closest to the experimental test. The results of the numerical study show that the best hyperelastic model for the imported GPS rubber model is the Neo-Hookean model. The tensile strength of GPS according to the experimental tensile test results is 16.93 MPa, while the result of the finite element method (FEM) is 16.75 MPa. The GPS modulus 200% according to the experimental tensile test results is 14.7 mm/mm, while the FEM result is 15.3 mm/mm. The difference between the FEM and experimental test values ​​for tensile strength and modulus 200% are below 5%. Maximum stress on GPS is 4,4 MPa and safety factor 3,8.

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