scispace - formally typeset
Search or ask a question
Author

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
More filters
Proceedings ArticleDOI
09 Feb 2018
TL;DR: In this paper, the authors found that the configurations between 0.68 diameter ratio and 20 blade numbers is the best configuration that has power coefficient of 0.049 and moment coefficient of 1.185, while the variations of number of blades used was 16, 20 and 24.
Abstract: Cross-flow wind turbine is one of the alternative energy harvester for low wind speeds area. Several factors that influence the power coefficient of cross-flow wind turbine are the diameter ratio of blades and the number of blades. The aim of this study is to find out the influence of the number of blades and the diameter ratio on the performance of cross-flow wind turbine and to find out the best configuration between number of blades and diameter ratio of the turbine. The experimental test were conducted under several variation including diameter ratio between outer and inner diameter of the turbine and number of blades. The variation of turbine diameter ratio between inner and outer diameter consisted of 0.58, 0.63, 0.68 and 0.73 while the variations of the number of blades used was 16, 20 and 24. The experimental test were conducted under certain wind speed which are 3m/s until 4 m/s. The result showed that the configurations between 0.68 diameter ratio and 20 blade numbers is the best configurations that has power coefficient of 0.049 and moment coefficient of 0.185.Cross-flow wind turbine is one of the alternative energy harvester for low wind speeds area. Several factors that influence the power coefficient of cross-flow wind turbine are the diameter ratio of blades and the number of blades. The aim of this study is to find out the influence of the number of blades and the diameter ratio on the performance of cross-flow wind turbine and to find out the best configuration between number of blades and diameter ratio of the turbine. The experimental test were conducted under several variation including diameter ratio between outer and inner diameter of the turbine and number of blades. The variation of turbine diameter ratio between inner and outer diameter consisted of 0.58, 0.63, 0.68 and 0.73 while the variations of the number of blades used was 16, 20 and 24. The experimental test were conducted under certain wind speed which are 3m/s until 4 m/s. The result showed that the configurations between 0.68 diameter ratio and 20 blade numbers is the best configurations ...

1 citations

Proceedings ArticleDOI
29 Mar 2016
TL;DR: In this article, the authors used an electric motor to drive a hermetic compressor with an HFC-134a block expansion valve, and the results showed that the highest coefficient of performance (COP) and the electric power of system were 6.3 and 638 Watt, respectively.
Abstract: Vehicle cabin in tropical countries requires the cooling during the day for comfort of passengers. Air conditioning machine is commonly driven by an internal combustion engine having a great power, which the conventional compressor is connected to crank shaft. The stage of research done is driving the hermetic compressor with an electric motor, and using block expansion valve. The HFC-134a was used as refrigerant working. The primary parameters observed during the experiment are pressure, temperature, and power consumption for different cooling capacities. The results show that the highest coefficient of performance (COP) and the electric power of system are 6.3 and 638 Watt, respectively.

1 citations

Proceedings ArticleDOI
29 Mar 2016
TL;DR: In this paper, the authors used SolidWorks software to simulate the response of the Smart-EV UNS main structure when crashing rigid barrier from the front, and the crash simulation was done in according to the NHTSA (National Highway Traffic Safety Administration) within a speed of 35 mph.
Abstract: Sebelas Maret University has been developing an Electric Vehicle namely SmarT-EV UNS. The main structure of the car are chasis and body. The chasis is made from steel and the body is made from fiberglass composite. To ensure the safety of the car, both static and dynamic tests were carried out to these structures, including their materials, like: tensile test, bending test, and impact test. Another test needed by this vehicle is crashworthiness test. To perform the test, it is needed complex equipments and it is quite expensive. Another way to obtain vehicle crashworthiness behaviour is by simulate it. The purpose of this study was to simulate the response of the Smart-EV UNS electric vehicle main structure when crashing rigid barrier from the front. The crash simulation was done in according to the NHTSA (National Highway Traffic Safety Administration) within the speed of the vehicle of 35 mph. The UNS Electric Vehicle was modelled using SolidWorks software, and the simulation process was done by finite element method using ANSYS software. The simulation result showed that the most internal impact energy was absorbed by chassis part. It absorbed 76.2% of impact energy, then the base absorbed 11.3 %, while the front body absorbed 2.5 %, and the rest was absorbed by fender, hood, and other parts.

1 citations

Proceedings ArticleDOI
03 Jan 2017
TL;DR: In this article, the influence of ODGV on the flow pattern characteristic around a Savonius wind turbine was studied. But the authors only used the Navier-Stokes equations with the standard k-e turbulent model.
Abstract: Standart Savonius wind turbine have a low performance such as low coefficient of power and low coefficient of torque compared with another type of wind turbine. This phenomenon occurs because the wind stream can cause the negative pressure at the returning rotor. To solve this problem, standard Savonius combined with Omni Directional Guide Vane (ODGV) proposed. The aim of this research is to study the influence of ODGV on the flow pattern characteristic around of Savonius wind turbine. The numerical model is based on the Navier-Stokes equations with the standard k-e turbulent model. This equation solved by a finite volume discretization method. This case was analyzed by commercial computational fluid dynamics solver such as SolidWorks Flow Simulations. Simulations were performed at the different wind directions; there are 0°, 30°,60° at 4 m/s wind speed. The numerical method validated with the past experimental data. The result indicated that the ODGV able to augment air flow to advancing rotor and decrea...

1 citations

Proceedings ArticleDOI
23 Apr 2019
TL;DR: In this article, thermogravimetry analysis was carried out to analyze three samples of sawdust, i.e., Tectona Grandis Sawdust, Albizia Chinensis Sawdust and the mixture of both sawdust.
Abstract: Sawdust waste has a great potential to be developed into alternative energy in Indonesia. It has varying methods to process it into certain products, e.g., pyrolysis process. However, the sawdust pyrolysis process still not very popular, especially not so many people understand its thermal characteristics. In this study, thermogravimetry analysis was carried out to analysis three samples of sawdust, i.e., Tectona Grandis Sawdust, Albizia Chinensis Sawdust, and the mixture of both sawdust. This research was conducted to obtain pyrolysis characteristics, including devolatilization profiles and kinetic energy. This study used three samples each has a mass of 20 grams. Each sample is heated in a furnace with a heating rate of 15 °C/min until the temperature reaches 600°C and hold it for 10 minutes. During the data retrieval, the furnace flowed with nitrogen, thus the condition of no oxygen is present in the reactor. The results of this study indicate that the mixture of Tectona Grandis and Albizia Chinensis has the highest activation energy value of all pyrolysis samples with 80.79 kJ/mol.

1 citations


Cited by
More filters
Journal Article
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