Article Per Year (5 Year)
p-Index From 2021 - 2026
2.63
P-Index
This Author published in this journals
All Journal Jurnal Teknik Mesin Jurnal Teknik Mesin Jurnal Teknologi dan Vokasi
Arfidian Rachman
Institut Teknologi Padang
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

Published : 28 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 28 Documents
Search

 1   2   3 
STUDI ALIRAN 3-D NEAR ENDWALL PADA INTERAKSI AIRFOIL DAN PLAT DATAR Rachman, Arfidian; Yuana Dewi, Arfita; Effendi, Asnal
Jurnal Teknologi dan Vokasi Vol 2 No 2 (2024): Jurnal Teknologi dan Vokasi
Publisher : ITP Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtv.2024.2.2.106-112

Abstract

Studies of the existence of these secondary flow structures are based on the effect of the emergence of secondary flows in the wing-body configuration on aircraft, i.e. the presence of wingtip-vortex on the tip region and the creation of several elements of the vortex flow on the endwall region, both of which together will cause the blockage of the main flow. The existence of this blockage effect will affect the aerodynamic characteristics of the lift and drag, where it directly affects the effectiveness and efficiency of the wing. In the endwall area the phenomenon can be observed is the shift of the position of the saddle point towards the pressure side. Whereas from the isobar contour the movement of the minimum pressure point on the upper surface is found to be closer to the leading edge, and the area of maximum pressure on the lower surface moves towards the press side. The research will be conducted experimentally on a wing geometry variation modeled on a flat plate with an angle of attack variation (α) = 0o.
STUDI NUMERIK ALIRAN 3D INTERAKSI AIRFOIL DAN PLAT DATAR Rachman, Arfidian; Yuana Dewi, Arfirta; Effendi, Asnal
Jurnal Teknologi dan Vokasi Vol 3 No 1 (2025): Jurnal Teknologi dan Vokasi
Publisher : ITP Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtv.2025.3.1.101-107

Abstract

The effect of secondary flows in the wing-body configuration on aircraft—that is, the presence of wingtip-vortex on the tip region and the creation of multiple elements of the vortex flow on the endwall region—is the basis for studies of the existence of these secondary flow structures. These two factors combined will obstruct the main flow. The presence of this blocking effect will have an impact on the lift and drag aerodynamics, which directly impacts the wing's efficacy and efficiency. The saddle point's position shifting toward the pressure side is a phenomenon that can be seen in the endwall area. On the other hand, the area of maximum pressure on the lower surface travels towards the press side, and the movement of the minimum pressure point on the upper surface is found to be closer to the leading edge based on the isobar contour. The study will be carried out experimentally on a flat plate model with a wing shape change with an angle of attack variation (α) = 0o.
EXPERIMENTAL ANALYSIS OF HEAT RECOVERY WHEEL FOR TROPICAL CLIMATE Rachman, Arfidian; Yuana Dewi Rachman, Arfita; Effendi, Asnal; Nesti, Lisa
Jurnal Teknologi dan Vokasi Vol 2 No 1 (2024): Jurnal Teknologi dan Vokasi
Publisher : ITP Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtv.2024.2.1.92-96

Abstract

This paper presented and used experimental analysis to examine design that integrates an active heat recovery wheel mechanism into a windcatcher. A rotational thermal heat recovery is incorporated into the windcatcher channel of the proposed system. An experiment was conducted to examine how the heat recovery mechanism affected the windcatcher performance, demonstrating the system ability to provide the necessary fresh air rates. A test room model, measuring 4x4x3 meters and depicting a small classroom, was integrated with the windcatcher model. Ventilation rates managed to supply sufficient ventilation even with the rotational heat recovery wheel blocked. This active recovery has the potential to lessen the demand on space heating systems in addition to providing enough ventilation. The heat in the exhaust airstreams was caught and transferred to the incoming airstream, boosting the temperature between 7-9oC depending on the indoor/outdoor conditions. This indicates that there is a great deal of room for further development of the idea, allowing for larger-scale testing and investigation of the system's heat transfer characteristics.
STUDI ALIRAN 3-D NEAR ENDWALL PADA INTERAKSI AIRFOIL DAN PLAT DATAR Rachman, Arfidian; Yuana Dewi, Arfita; Effendi, Asnal
Jurnal Teknologi dan Vokasi Vol 2 No 2 (2024): Jurnal Teknologi dan Vokasi
Publisher : ITP Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtv.2024.2.2.106-112

Abstract

Studies of the existence of these secondary flow structures are based on the effect of the emergence of secondary flows in the wing-body configuration on aircraft, i.e. the presence of wingtip-vortex on the tip region and the creation of several elements of the vortex flow on the endwall region, both of which together will cause the blockage of the main flow. The existence of this blockage effect will affect the aerodynamic characteristics of the lift and drag, where it directly affects the effectiveness and efficiency of the wing. In the endwall area the phenomenon can be observed is the shift of the position of the saddle point towards the pressure side. Whereas from the isobar contour the movement of the minimum pressure point on the upper surface is found to be closer to the leading edge, and the area of maximum pressure on the lower surface moves towards the press side. The research will be conducted experimentally on a wing geometry variation modeled on a flat plate with an angle of attack variation (α) = 0o.
STUDI NUMERIK ALIRAN 3D INTERAKSI AIRFOIL DAN PLAT DATAR Rachman, Arfidian; Yuana Dewi, Arfirta; Effendi, Asnal
Jurnal Teknologi dan Vokasi Vol 3 No 1 (2025): Jurnal Teknologi dan Vokasi
Publisher : ITP Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtv.2025.3.1.101-107

Abstract

The effect of secondary flows in the wing-body configuration on aircraft—that is, the presence of wingtip-vortex on the tip region and the creation of multiple elements of the vortex flow on the endwall region—is the basis for studies of the existence of these secondary flow structures. These two factors combined will obstruct the main flow. The presence of this blocking effect will have an impact on the lift and drag aerodynamics, which directly impacts the wing's efficacy and efficiency. The saddle point's position shifting toward the pressure side is a phenomenon that can be seen in the endwall area. On the other hand, the area of maximum pressure on the lower surface travels towards the press side, and the movement of the minimum pressure point on the upper surface is found to be closer to the leading edge based on the isobar contour. The study will be carried out experimentally on a flat plate model with a wing shape change with an angle of attack variation (α) = 0o.
EVALUASI KINERJA SISTEM PENDINGIN KOMPRESI UAP VRF DENGAN SIKLUS INJEKSI Rachman, Arfidian; Yuana Dewi, Arfita; Effendi, Asnal; Nesti, Lisa
Jurnal Teknologi dan Vokasi Vol 1 No 1 (2023): Jurnal Teknologi dan Vokasi
Publisher : ITP Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtv.2023.1.1.86-92

Abstract

As a result of a decrease in the mass flow rate at the inlet section of a variable refrigerant flow (VRF) cooling system, the refrigerant flow system performs poorly. To increase efficiency the steam injection cycle method is used. The effects of steam injection are theoretically explored in this study over a wide range of medium pressures and ambient temperatures, and the findings are supported by experimental data. Compressor heating capacity, input power, coefficient of performance (COP), and isentropic efficiency are all affected by pressure. At low ambient temperatures, the increase in COP by steam injection is remarkable. In this study, the performance of the cooling system with the injection cycle was evaluated, the system with this injection cycle resulted in an increase in cooling capacity of 3.26% and an energy efficiency ratio (EER) of 2.32%.
TINJAUAN TENTANG SISTEM PENDINGINAN ADSORPSI SURYA Rachman, Arfidian; Dewi, Arfita Yuana; Effendi, Asnal
Jurnal Teknologi dan Vokasi Vol 3 No 2 (2025): Jurnal Teknologi dan Vokasi
Publisher : ITP Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtv.2025.3.2.154-159

Abstract

The primary aim of this paper is to offer key insights into solar energy and waste heat adsorption cooling systems, as well as to present a helpful approach concerning the design aspects of the adsorbent bed utilized in adsorption cooling. In recent decades, solar-powered water purifiers have primarily been utilized for heating water in residential settings. In contrast, solar cooling systems have mainly been designed for demonstration purposes. It indicates that absorption cooling systems are better suited for large buildings, while adsorption cooling systems show greater promise for smaller air conditioning units. It is advised to plan solar-powered systems in public facilities. Highly efficient heat pumps are regarded as the best supplementary heat providers since they can operate independently of weather conditions.
TINJAUAN VARIABEL REFRIGERANT VOLUME Rachman, Arfidian; Yuana Dewi, Arfita; Effendi, Asnal; Nesti, Lisa
Jurnal Teknologi dan Vokasi Vol 1 No 2 (2023): Jurnal Teknologi dan Vokasi
Publisher : ITP Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtv.2023.1.2.111-120

Abstract

VRV systems are multi-split HVAC systems that maintain different portions by varying refrigerant volume. These systems control refrigerant volume for efficiency and dependability. This review aims to identify VRV system elements affecting operational and performance factors. Previous studies are crucial for future large-scale VRV development.
Co-Authors Arfita Yuana Dewi Arianto, Benny Ashari, Lucky Asmara Yanto Asnal Effendi Benny Arianto Lucky Ashari Nesti, Lisa Nofriady Handra, Nofriady Pratiwi, Putri Putri Pratiwi Sulaeman Sulaeman Sulaiman Syafrul Hadi Yuana Dewi Rachman, Arfita Yuana Dewi, Arfirta