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Dominicus Danardono Dwi Prija Tjahjana

Bio: Dominicus Danardono Dwi Prija Tjahjana is an academic researcher from Sebelas Maret University. The author has contributed to research in topics: Turbine & Wind speed. The author has an hindex of 7, co-authored 65 publications receiving 182 citations.

Papers published on a yearly basis

Papers
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Journal ArticleDOI
TL;DR: In this article, the authors used numerical and experimental analyses to investigate the reduction in the operating temperature of photovoltaic panels with an air-cooled heat sink, which was designed as an aluminum plate with perforated fins that is attached to the back of the PV panel.
Abstract: An increase in the operating temperature of photovoltaic (PV) panels caused by high levels of solar irradiation can affect the efficiency and lifespan of PV panels. This study uses numerical and experimental analyses to investigate the reduction in the operating temperature of PV panels with an air-cooled heat sink. The proposed heat sink was designed as an aluminum plate with perforated fins that is attached to the back of the PV panel. A comprehensive computational fluid dynamics (CFD) simulation was conducted using the software ANSYS Fluent to ensure that the heat sink model worked properly. The influence of heat sinks on the heat transfer between a PV panel and the circulating ambient air was investigated. The results showed a substantial decrease in the operating temperature of the PV panel and an increase in its electrical performance. The CFD analysis in the heat sink model with an air flow velocity of 1.5 m/s and temperature of 35°C under a heat flux of 1000 W/m2 showed a decrease in the PV panel’s average temperature from 85.3°C to 72.8°C. As a consequence of decreasing its temperature, the heat sink increased the open-circuit photovoltage ( ) and maximum power point ( ) of the PV panel by 10% and 18.67%, respectively. Therefore, the use of aluminum heat sinks could provide a potential solution to prevent PV panels from overheating and may indirectly lead to a reduction in CO2 emissions due to the increased electricity production from the PV system.

62 citations

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TL;DR: In this paper, the authors used a passive cooling system by adding a heat sink with fins to the body panel of the solar cell to prevent overheating of photovoltaic (PV) panels.
Abstract: High energy demand is leading to the replacement of fossil energy with renewable sources such as solar energy. Solar cells are devices used to generate solar energy. However, when exposed to sunlight with high intensity, a solar cell can suffer a decrease in performance due to overheating. This issue can be addressing by adding a cooling system. This study used a passive cooling system by adding a heat sink with fins to the body panel of the solar cell. The advantage of the passive cooling system is that it does not require additional energy. The number of fins and types of material were varied to obtain the best passive cooling system. The number of fins used was 5, 10, and 15, and the materials used were aluminum and copper. The wind speed vector and the temperature distribution were investigated through simulation. The results showed an increase in the number of fins provided better cooling capacity and increased the photovoltaic performance. The best cooling capability and performance were obtained using 15 fins with a copper base and fin heat sink materials. The decrease in temperature and the increase in efficiency were 10.2 °C and 2.74%, respectively. Therefore, the use of passive cooling system based on heat sinks with fins could provide a potential solution to increase performance and prevent overheating of photovoltaic (PV) panel systems.

17 citations

Journal ArticleDOI
TL;DR: In this paper, a solid review of the design of axial eddy current braking system is presented, which is very promising for an alternative braking system for electric vehicles, and a potential issue for developing axial ECB is also discussed to explore the braking performance improvement of the axial type.
Abstract: Eddy Current Brake (ECB) is a type of electric braking that uses eddy current to produce braking forces. This article delivers a solid review of the design of Axial ECB, which is very promising for an alternative braking system. Several types of axial ECB are classified and named as a single disk, double disk, and unipolar model. The classification of axial ECB is based on the design of coil placement, which induces axial area of the disk as well as the electromagnet source. A potential issue for the development of axial ECB is also discussed to explore the braking performance improvement of the axial type ECB. It was highlighted that research on how to change the direction of magnetic field vectors by changing the shape of the pole-shoe on the electromagnetic ECB in axial type has not been widely studied. Therefore, this issue would be interesting for future investigation.

16 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of Reynolds number on the performance of a wind turbine with slotted blades was investigated based on the torque coefficient, power coefficient, and tip speed ratio (TSR).

16 citations

Journal ArticleDOI
TL;DR: In this article, numerical predictions of a cavitating propeller in open water and uniform inflow are presented with computational fluid dynamics (CFD) Simulations were carried out using Ansys Numerical simulation based on Reynolds-averaged Navier-Stokes equations for the conservative form and the Rayleigh-Plesset equation for the mass transfer cavitation model was conducted with turbulent closure of the fully turbulent K-epsilon (k-e) model and shear stress transport (SST) The influence of temperature on cavitation extension was investigated between 0 and 50 °
Abstract: Cavitation is a complex phenomenon to measure, depending on site conditions in specific regions of the Earth, where there is water with various physical properties The development of ship and propulsion technology is currently intended to further explore territorial waters that are difficult to explore Climate differences affect the temperature and physical properties of water on Earth This study aimed to determine the effect of cavitation related to the physical properties of water Numerical predictions of a cavitating propeller in open water and uniform inflow are presented with computational fluid dynamics (CFD) Simulations were carried out using Ansys Numerical simulation based on Reynolds-averaged Navier–Stokes equations for the conservative form and the Rayleigh–Plesset equation for the mass transfer cavitation model was conducted with turbulent closure of the fully turbulent K-epsilon (k-e) model and shear stress transport (SST) The influence of temperature on cavitation extension was investigated between 0 and 50 ° C The results obtained showed a trend of cavitation occurring more aggressively at higher water temperature than at lower temperature

15 citations


Cited by
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TL;DR: This book by a teacher of statistics (as well as a consultant for "experimenters") is a comprehensive study of the philosophical background for the statistical design of experiment.
Abstract: THE DESIGN AND ANALYSIS OF EXPERIMENTS. By Oscar Kempthorne. New York, John Wiley and Sons, Inc., 1952. 631 pp. $8.50. This book by a teacher of statistics (as well as a consultant for \"experimenters\") is a comprehensive study of the philosophical background for the statistical design of experiment. It is necessary to have some facility with algebraic notation and manipulation to be able to use the volume intelligently. The problems are presented from the theoretical point of view, without such practical examples as would be helpful for those not acquainted with mathematics. The mathematical justification for the techniques is given. As a somewhat advanced treatment of the design and analysis of experiments, this volume will be interesting and helpful for many who approach statistics theoretically as well as practically. With emphasis on the \"why,\" and with description given broadly, the author relates the subject matter to the general theory of statistics and to the general problem of experimental inference. MARGARET J. ROBERTSON

13,333 citations

Journal ArticleDOI
TL;DR: In this article, the state of the art for various air conditioning (AC) system solutions to EVs was critically reviewed and a comparison listing the various pros and cons of different available solutions was presented.
Abstract: The air conditioning (AC) system provides cool, heating and ventilation in the cabin of the electric vehicles (EVs). It is necessary to control the interior thermal environments of the vehicle and ensure safety in visibility. Because AC systems are electrically powered, vehicle range is reduced drastically when the AC system is operating. EVs present a particular challenge to the development of more efficient AC systems for automotive applications. In this paper, the state of the art for various AC system solutions to EVs was critically reviewed. The investigations of alternative solutions are continuing along many parallel routes, e.g. vapor compression refrigeration-dedicated heater AC systems, reversible vapor compression heat pump AC systems, non-vapor compression AC systems and integrated thermal management system combined AC and battery pack. The characteristics and particular applications of each solution have been extensively discussed. Finally, a comparison listing the various pros and cons of the different available solutions was presented.

136 citations

Journal ArticleDOI
TL;DR: Details of various feasible cooling methods, including novel and advanced solutions for P.V. panels are presented to provide better insight and valuable guidelines for researchers who intend to study, improve or optimise any type of cooling techniques of P·V.

124 citations

Journal ArticleDOI
TL;DR: In this article, the best configuration between guide vanes and cross-flow vertical axis wind turbine was investigated to determine the turbine with the highest power coefficient, which increased around 59% of the turbine's performance using GV.
Abstract: A cross-flow wind turbine has a high torque coefficient at a low tip speed ratio; therefore, it is a good candidate for a self-starting turbine. This study aims to investigate the best configuration between guide vanes and cross-flow vertical axis wind turbine. The experiment test was carried out to determine the turbine with the highest power coefficient. The cross-flow turbine has 14, 18, and 22 blades with using 6,10 and 14 blades of guide vane (GV) was developed in this study, employing 15°, 25°, 35°, 45°, 55°, 65°, and 75° of tilt angles in fifth different wind speed conditions 4 m/s, 6 m/s, 7.5 m/s, 9.20 m/s, and 11 m/s. The turbine has 22 blades with 14 GV blades at 55° of tilt angle blades producing more remarkable turbine performance improvement than other blades. The highest power coefficient (CP) of cross-flow using 14 GV blades at 55° was 0.0162 at 0.289 TSR, which increased around 59% of the turbine's performance using GV.

78 citations

Journal ArticleDOI
TL;DR: In this article, the authors present a comprehensive literature survey on the recent advancements in solar PV cooling technologies, the role of nanofluids on the performance of PV thermal systems, the available analyses of PV cooling techniques, the usage of Nanofluid as coolant and optical filter, and the effect of combined nano-fluid and nano-PCM on the overall performance of the photovoltaic systems.

58 citations