scholarly journals Pengaruh Variasi Radius Sudu Turbin Angin Darrieus Tipe Sudu-J

2020 ◽  
Vol 3 (02) ◽  
pp. 15-18
Author(s):  
Sulistyono Sulistyono ◽  
Elka Faizal ◽  
Alfi Tranggono Agus Salim
Keyword(s):  
Experimental Study ◽  
Wind Speed ◽  
Wind Turbine ◽  
Research Method ◽  
Alternative Energy ◽  
Vertical Shaft ◽  
Test Results ◽  
Independent Variables ◽  
Shaft Power ◽  
Front Radius

Utilization of alternative energy, therefore this wind turbine is used as an alternative energy power plant. So this experimental study is used to determine how much influence on the performance of the Darrieus type J-blade vertical shaft wind turbine by varying the blade radius. The method used is a true experimental research method. The independent variables in this study are variations in wind speed of 3, 4, 5, 6, and 7 m / s. The dependent variable in this research is shaft power and efficiency. Then the controlled variables in this study were the number of blades 3 and the front radius of the blade: 5, 10, and 15 mm. The test results and data processing shows that the blade radius of the Darrieus J-blade type of wind turbine affects the performance of the Darrieus J-blade type wind turbine. In testing the highest value was achieved at a blade radius of 15 mm with a wind speed of 7 m / s, namely the shaft power value of 0.323 Watt and the efficiency value of 4.673%.

scholarly journals The Effect of Green Marketing, Brand Image, and Atmosphere Store On Purchasing Decisions In Arei Adventure Store Surabaya 3

2020 ◽  
Vol 1 (3) ◽  
Author(s):  
Yanuar Bachrul Aqsony ◽  
Santirianingrum Soebandhi ◽  
Ani Wulandari
Keyword(s):  
Data Collection ◽  
Analytical Method ◽  
Research Method ◽  
Brand Image ◽  
Green Marketing ◽  
Purchase Decision ◽  
Test Results ◽  
Purchasing Decisions ◽  
Independent Variables ◽  
Marketing Activities

Purchasing decisions are one thing that is very influential in a product. Many factors influence purchasing decisions, including green marketing activities, brand image, and store atmosphere. The purpose of this study was to determine how the influence of green marketing, brand image, and store atmosphere both simultaneously and partially on purchasing decisions at Arei Adventure Store Surabaya 3. Data collection used was a questionnaire. The research method employed a random sample of 101 people. The analytical method mobilized was SPSS 24. The results of this study indicated that the independent variables simultaneously influence the dependent variable. This was evidenced from the significance value of 0,000 or less than 0.05 and F count = 27.791 while the F value was obtained at 2.70. Thus F count 27.791> F table 2.70. However, partially the green marketing variable was not significant to the purchase decision because the test results showed the value of t count = 1.425 0.05.

scholarly journals Analysis of the Influence of Product Quality and Promotion of Consumer Decisions to Subscribe to Mnc Vision (Case Study at pt. Mnc Sky Vision Palembang)

2019 ◽  
Vol 3 (12) ◽  
pp. 14-18
Keyword(s):  
Regression Analysis ◽  
Research Method ◽  
Linear Regression Analysis ◽  
Multiple Linear Regression Analysis ◽  
Test Results ◽  
Quality Research ◽  
Consumer Decisions ◽  
Independent Variables ◽  
Study Population

This study aims to look at consumer decisions in subscribing to MNC Vision at PT. MNC Sky Vision Palembang with independent variables of quality research and promotion. The study population was 540 MNC Vision customers in Palembang in 2018. As for the sample, there were 100 customers at the MNC Vision Palembang. This study uses the research method of multiple linear regression analysis. Based on the test results it was found that there was a positive and significant influence on the quality and promotion of consumer decisions in influencing consumer decisions to subscribe to MNC Vision.

Stress Analysis of Various Shaped Blade of Savonius Wind Turbine

2014 ◽  
Author(s):  
Jobaidur R. Khan ◽  
Mosfequr Rahman
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Alternative Energy ◽  
Energy Requirement ◽  
Turbine Blades ◽  
Vertical Axis ◽  
Physical Models ◽  
Vertical Axis Wind Turbine ◽  
Low Wind Speed ◽  
The World

Amidst of high demand of energy, the world is seeking alternative energy sources. Wind alone can fulfill most of the energy requirement of the world by its efficient conversion into energy. On efficiency measurement, Horizontal Axis Wind Turbines (HAWT) is the popular to the researchers, but it works best in places where the wind is not disturbed and has high wind power. The inherent advantage of facing the wind direction, design simplicity, less expensive technology for construction, lower wind start-up speeds, easier maintenance, and relatively quietness are turning the focus to Vertical Axis Wind Turbine (VAWT). The low wind speed and non-smooth wind flow regions are attracted for these machines. Savonius turbine is the simplest form of VAWT and operation is based on the difference of the drag force on its blades. The main objective of this study is to analyze a perfect mixture of new and innovative designs of Savonius turbine blades, which can make VAWT more attractive, efficient, durable and sustainable. This is studied by using blade with different numbers in operating in different wind speed. A Computational Fluid Dynamics (CFD) analysis has been used. 2D CAD models of various VAWT geometries are created and tested with CFD software ANSYS/FLUENT with a similar flow-driven motion in a wind tunnel. These simulations provided the aero-dynamic characteristics like shear stress, velocity distribution and pressure distribution. Some physical models with desired properties needed to be fabricated and tested inside tunnel to find the effect of different shapes in real.

scholarly journals Wind Turbine Wake Characterization for Improvement of the Ainslie Eddy Viscosity Wake Model

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2823 ◽  
Author(s):  
Hyungyu Kim ◽  
Kwansu Kim ◽  
Carlo Bottasso ◽  
Filippo Campagnolo ◽  
Insu Paek
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Eddy Viscosity ◽  
Wind Tunnel Test ◽  
Original Model ◽  
Test Results ◽  
Wake Model ◽  
Turbine Model

This paper presents a modified version of the Ainslie eddy viscosity wake model and its accuracy by comparing it with selected exiting wake models and wind tunnel test results. The wind tunnel test was performed using a 1.9 m rotor diameter wind turbine model operating at a tip speed ratio similar to that of modern megawatt wind turbines. The control algorithms for blade pitch and generator torque used for below and above rated wind speed regions similar to those for multi-MW wind turbines were applied to the scaled wind turbine model. In order to characterize the influence of the wind turbine operating conditions on the wake, the wind turbine model was tested in both below and above rated wind speed regions at which the thrust coefficients of the rotor varied. The correction of the Ainslie eddy viscosity wake model was made by modifying the empirical equation of the original model using the wind tunnel test results with the Nelder-Mead simplex method for function minimization. The wake prediction accuracy of the modified wake model in terms of wind speed deficit was found to be improved by up to 6% compared to that of the original model. Comparisons with other existing wake models are also made in detail.

Evaluation of the Power Output of a Wind Turbine With a Brimmed Diffuser Shroud in Fluctuating Flows

2007 ◽  
Author(s):  
S. Roberto Gonzalez A. ◽  
Yuji Ohya ◽  
Takashi Karasudani ◽  
Shusaku Iba ◽  
Kimihiko Watanabe
Keyword(s):  
Wind Speed ◽  
Power Plant ◽  
Wind Energy ◽  
Wind Turbine ◽  
Power Output ◽  
Alternative Energy ◽  
Fossil Fuels ◽  
Research Work ◽  
Energy Output ◽  
The World

Fossil fuels have been used extensively all over the world to satisfy energy demands. However, their availability is limited and their negative impact on the environment undeniable. Due to this, the need to develop alternative energy resources was recognized a few decades ago. Among different alternatives that have been developed, wind energy appears as a promising option to be implemented in many parts of the world. Nonetheless, its development and the cost per kW are still higher than that from fossil fuels. The intermittence of its capability to produce energy and the size of the wind power plant (as compared to a coal or nuclear power plant of the same energy output) have not made its implementation easier. In order to make wind energy more competitive and attractive to investors, new energy systems are desired. Specifically, it is desired to have a higher energy output. In this study a brimmed-diffuser shroud was incorporated into a 1 kW wind turbine. The turbine was then evaluated under fluctuating wind conditions. The experiments were conducted at the large boundary wind tunnel of Kyushu University. It is shown that power output increases for a fluctuating flow as opposed to a steady flow. The turbine power output is capable of following the changes in the wind speed accurately in the range of wind speed fluctuations tested. This is shown by correlation analysis and supported by the frequency spectrum. This study is part of a larger research work aimed at evaluating a novel wind turbine design. The current results are very encouraging. Possible wind sites of wind speed average lower than the current minimum accepted values can be exploited by using a turbine like the one evaluated in this work.

scholarly journals PENGARUH PUTARAN TURBIN ANGIN SUMBU HORIZONTAL KOMBINASI PEMBERAT BOLA PEJAL

INFO-TEKNIK ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 115
Author(s):  
Firda Herlina ◽  
Mujiburrahman Mujiburrahman ◽  
Adi Asyari
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Experimental Research ◽  
Research Method ◽  
Rotation Speed ◽  
Industrial Sector ◽  
Energy Sources ◽  
Solid Object ◽  
Wind Speeds ◽  
The Difference

Along with the increase in population is directly proportional to the need for energy sources both to support people's lives and the increase in the industrial sector in Indonesia. One of the most widely used sources of electricity is wind. Wind turbines are very sensitive to the wind speed they receive, as a result of fluctuations in wind speed that affect wind rotation speed. For this reason, the author has the idea to combine a wind turbine with a solid object turbine, it is hoped that the combination can produce more consistent rotation. The tool used is a wind turbine combined with solid blade ball weights 8, 9 and 10 and ballast of 10 gr, 20 gr and 30 gr for each blade and wind speeds of 3.3 m / s, 3.6 m / s and 3.9. m / s with the experimental research method, the experiment was carried out 3 times in each tool for ± 2 minutes which was expected to produce a combination of the variables studied in the form of a turbine with the maximum rotational speed and the most consistent rotation. From these experiments, it was found that a turbine with 10 blades, a weight of 10 gr at a wind speed of 3.9 m / s had the fastest rotation, namely 116.43 rpm while a 9 blade turbine with a weight of 30 gr at all three wind speeds was the turbine with the most consistent rotation, namely the difference between the top and bottom rotation is 2.53 rpm.

scholarly journals PENGARUH DYMETIL ESTER PADA BIOSOLAR TERHADAP UNJUK KERJA MOTOR DIESEL SATU SILINDER PADA SUHU PEMANASAN BAHAN BAKAR 95 oC

2018 ◽  
Vol 4 (1) ◽  
Author(s):  
Yusup Nur Rohmat ◽  
Kusnandar Kusnandar ◽  
Rizki Adila Saputro
Keyword(s):  
Fatty Acid ◽  
Research Method ◽  
Alternative Energy ◽  
Descriptive Analysis ◽  
Research Result ◽  
Fuel Mixture ◽  
Esterification Reaction ◽  
Biodiesel Fuel ◽  
Test Results ◽  
Petroleum Reserves

The depletion of petroleum reserves makes the emergence of a variety of alternative energy, one of which is Biodiesel. Biodiesel is a fatty acid ester derived from vegetable oil or animal by transesterification or esterification reaction. The purpose of this study was conducted to determine the effect of the use of fuel mixture of biodiesel jelantah with heating 950C to power, torque and Sfc. The test is done by loading the lamp load from 200 - 3200 watt on variation of biodiesel fuel volume by 30%, 40% and 50%. The research method used is descriptive analysis where the result of research is described and described based on research result. From the test results resulted in the addition of biodiesel jelantah fuel effect on power, torque and Sfc generated diesel motor.

Increasing the Wind Turbine Power Using Aerodynamics Shape of the Building

2015 ◽  
Vol 725-726 ◽  
pp. 1456-1462 ◽  
Author(s):  
Sergey Aleksandrovich Krivoy ◽  
Nikolay Sergeevich Bolshakov ◽  
Xeniya Mikhailovna Rakova
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Energy Saving ◽  
Economic Impact ◽  
Alternative Energy ◽  
Payback Period ◽  
Energy Sources ◽  
The Real ◽  
Alternative Energy Sources ◽  
Real Increase

Energy saving techniques including the use of alternative energy sources become more and more popular. One of the alternative energy sources is wind. Wind turbines are highly relevant in the areas of wind (such as coasts). This paper proposes a method of increasing the power of wind turbine due to architectural solutions such as streamlining facade by the example of the school. The calculations of the real increase in wind speed and power of the selected wind turbine have been promoted. The payback period graphs of the unit have been discovered in two variants (with changing the façade and without changing the facade). The economic impact has been analyzed. It has been concluded that the proposed scheme is profitable.

scholarly journals Wind Turbine Operation Curves Modelling Techniques

Electronics ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 269 ◽  
Author(s):  
Davide Astolfi
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Rotational Speed ◽  
Gaussian Kernel ◽  
Percentage Error ◽  
Support Vector ◽  
Power Monitoring ◽  
Independent Variables ◽  
Error Metrics

Wind turbines are machines operating in non-stationary conditions and the power of a wind turbine depends non-trivially on environmental conditions and working parameters. For these reasons, wind turbine power monitoring is a complex task which is typically addressed through data-driven methods for constructing a normal behavior model. On these grounds, this study is devoted the analysis of meaningful operation curves, which are rotor speed-power, generator speed-power and blade pitch-power. A key point is that these curves are analyzed in the appropriate operation region of the wind turbines: the rotor and generator curves are considered for moderate wind speed, when the blade pitch is fixed and the rotational speed varies (Region 2); the blade pitch curve is considered for higher wind speed, when the rotational speed is rated (Region 2 12). The selected curves are studied through a multivariate Support Vector Regression with Gaussian Kernel on the Supervisory Control And Data Acquisition (SCADA) data of two wind farms sited in Italy, featuring in total 15 2 MW wind turbines. An innovative aspect of the selected models is that minimum, maximum and standard deviation of the independent variables of interest are fed as input to the models, in addition to the typically employed average values: using the additional covariates proposed in this work, the error metrics decrease of order of one third, with respect to what would be obtained by employing as regressors only the average values of the independent variables. In general it results that, for all the considered curves, the prediction of the power is characterized by error metrics which are competitive with the state of the art in the literature for multivariate wind turbine power curve analysis: in particular, for one test case, a mean absolute percentage error of order of 2.5% is achieved. Furthermore, the approach presented in this study provides a superior capability of interpreting wind turbine performance in terms of the behavior of the main sub-components and eliminates as much as possible the dependence on nacelle anemometer data, whose use is critical because of issues related to the sites complexity.

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