Multi-Parameter Optimization of Efficiency, Capital Cost and Mass of Ferris Wheel Turbine for Low Wind Speed Regions

The design and development of wind turbines in low-wind-speed areas involves several technical and financial challenges related to maximizing conversion efficiency and minimizing cost. Unfortunately, much of the African continent is dominated by low-wind-speed resources. In this study, a multi-parameter optimization method is used to explore the design of a novel Ferris wheel wind turbine (FWT) technology, which has an 800-kW generation capability. We used the tip speed ratio, lift-to-drag ratio and power coefficient to determine the optimal efficiency by varying the number of blades and rim diameters. The capital cost estimates, as affected by rim diameter and the number of blades, are presented. This paper studies FWTs at their rated wind speeds because wind turbines have their maximum performance at the rated wind speeds, and this allows one to observe the effects of changing the rim diameter and the number of blades without the need to consider the location of the turbine. The results show that reducing the number of spokes by half (from 64 to 32) on the four rim diameters studied decreases the efficiency by less than 0.19%, while reducing the acquisition cost by 42%, installation cost by 42% and mass by 28%. Reducing the number of spokes to a quarter (i.e., from 32 to 16) decreases the efficiency by less than 0.31%, reduces the acquisition and installation costs by 36% and 35.5%, respectively, and the mass by 19.2%, of the four rim diameters studied. The reduction of the number of blades has a significant effect on the efficiency and capital cost with varying rim diameters. This paper shows the potential for Ferris-wheel-based wind turbines for low-wind-speed conditions, such as those that prevail in parts of Africa.

A Techno-Economic Model for Wind Energy Costs Analysis for Low Wind Speed Areas

The global population is moving away from fossil fuel technologies due to their many disadvantages, such as air pollution, greenhouse gases emission, global warming, acid rain, health problems, and high costs. These disadvantages make fossil fuels unsustainable. As a result, renewable energy is becoming more attractive due to its steadily decreasing costs. Harnessing renewable energy promises to meet the present energy demands of the African continent. The enormous renewable energy potential available across the African continent remains largely untapped, especially for wind energy. However, marginal and fair wind speeds and power densities characterize African wind energy resulting in low and unsustainable power in many areas. This research develops a techno-economic model for wind energy cost analysis for a novel, Ferris wheel-based wind turbine. The model is used to techno-economically analyze the siting of wind turbine sites in low wind speed areas on the African continent. The wind turbine’s technical performance is characterized by calculating the annual energy production and the capacity factor using the wind Weibull probability distribution of the cities and theoretical power curve of the wind turbine. Its economic performance is evaluated using annualized financial return on investment, simple payback period, and levelized cost of electricity. The techno-economic model is validated for 21 African cities and shows that the Ferris wheel-based design is very competitive with four current, commercial wind turbines, as well as with other sources of energy. Hence, the new wind turbine may help provide the economical, clean, renewable energy that Africa needs.

THE IMPLEMENTATION OF PROBLEM POSING WITH FERRIS WHEEL HYDROLYSIS TO IMPROVE SCIENCE PROCESS SKILLS

This study aims to determine the students’ science process skills towards Salt Hydrolysis material in class XI IPA of SMA Katolik Talino Ambawang before and after being given the problem-posing learning model by using Ferris wheel hydrolysis and how much it improves the skills. It is a pre-experimental study with a one-group pretest-posttest design. The sampling technique used is saturated sampling, of which the subjects are 12 students of XI IPA. The normality test used on the pretest and posttest results is the Shapiro-Wilk test, which results in a normal distribution, Asymp.Sig. (2-tailed) greater than 0,05 with a significance pretest of 0,197 and postest of 0,547. The t-test results of the pairing sample indicate that the Asymp. Sig. (2-tailed) value is less than 0.05, which is 0,000 < 0.05. It was concluded that there is a difference between the students’ science process before and after the treatment. The mean scores of the students’ skills before and after the treatment are respectively 45,69% and 82,36%, with a high category. The value of 0,68 from the N-Gain calculation showed that the problem-posing learning model using Ferris wheel hydrolysis on Salt Hydrolysis material improved the students’ skills with the medium category.

Designing learning trajectory of circle using the context of Ferris wheel

Ferris wheel is one amusement playground that resembles a giant spinning wheel. Many students are familiar with the Ferris wheel in the mini version of it at night market festivals. This is the potential for learning mathematics. Furthermore, there is a mathematical learning approach called Indonesian Realistic Mathematics Education (IRME) where students learn with contexts which are close to students' life as starting points. Therefore, this study aims to design a learning trajectory using the IRME approach with the Ferris wheel as the context in the learning process to support students' understanding of the learning about circles. The research method is design research that consists of three stages: preliminary design, design experiments, and retrospective analysis. The subjects were 20 eighth-grade students from one of the private Junior High School in Yogyakarta. The instruments used are videos to see the learning process and when students work on the given problems, photos to refer the results of student work, and written test in worksheets to get the data on student's work. The research result explores the learning trajectory practiced using the Ferris wheel as the context seen in the student's daily activities. The learning trajectory consists of four events, namely assembling the Ferris wheel, drawing an illustration of the Ferris wheel, making a list of the circle parts, and solving a problem related to the parts of the circle. Lastly, this study shows that learning trajectory activities have essential roles in supporting students' understanding of the concept of a circle.

Elegant Revolutions

This chapter focuses on the theatrical and musical dynasty into which Steiner was born. It begins by introducing his father, Gabor, a visionary entrepreneur honored by Emperor Franz Joseph. Gabor created one of Austria’s most popular attractions of the late 19th century: Venice in Vienna, an amusement emporium a third the size of Buckingham Palace. Its centerpiece, the Riesenrad (Ferris Wheel), remains one of Vienna’s most iconic attractions. Gabor’s father, Maximilian, was an influential theater manager who did much to launch the era of Viennese operetta. It was Maximilian who convinced Johann Strauss Jr. to write for the stage, leading to such enduring works as Die Fledermaus. In this chapter, we see how the Steiner family’s championing of both “high” and “low” culture profoundly shaped Max, who later combined symphonic forms with accessible melodies in his own musical language.

Perancangan Bentuk Penyaring Sampah Pada Alat Penyaring Sampah Sungai

Background Improvement of river waste filtering technology currently still has many problems and constraints, ranging from the large number of river waste filtering tools that still require large amounts of power, up to large dimensions. Aim Then it is necessary to do a development by analyzing some form of filter to get the form of river waste filter in accordance with the character of the river. Method of planning and clarifying the tasks designing the product concept, designing the product form (embodiment design). Results and Discussion this research is a 4-arm ferris wheel-shaped trash filter made of aluminum plate which rotates clockwise, each arm has a capacity of 7 kg / round and the filter power requirement is 151.62 Watt. Conclusion with a capacity of 7 kg / round with a filter power requirement of 151.62 Watts to clean waste.