Keyword: wind energy

4 results found.

Research Article
A Comprehensive Review and the Efficiency Analysis of Horizontal and Vertical Axis Wind Turbines
European Journal of Sustainable Development Research, 2021, 5(3), em0163,
ABSTRACT: The Wind has the potential as an alternative source of renewable energy. Natural wind from the earth’s atmosphere is captured before converted into mechanical energy and then electrical energy. This paper presents a comparison of the efficiency of the horizontal axis wind turbine (HAWT) and vertical axis wind turbines (VAWT). The efficiency is determined using SOLIDWORKS Flow Simulation considering the wind scenario, a constant wind speed of 5 km/h with constant wind direction. It has been found that the drag coeffiecient of HAWT, VAWT–Savonius and VAWT– Darrieus are 0.5175, 0.2605 and 13.5622 respectively. This paper also proposes building a wind farm in Seamatan where the average wind speed is highest in Sarawak, Malaysia ranging from 4 km/h to 9 km/h.
Research Article
Fossil Fuel Substitution with Renewables for Electricity Generation – Effects on Sustainability Goals
European Journal of Sustainable Development Research, 2020, 4(1), em0111,
ABSTRACT: The substitution of fossil fuel power plants with renewable units will lead to a profound reduction of CO2 emissions and will assist in evading the Global Climate Change. Using demand data from the electricity grid of Texas, this paper develops a scenario for the substitution of coal, at first, and of all fossil fuel power plants, secondly, in the entire State of Texas. Meeting the electricity demand of the grid with renewables, makes it necessary to develop significant energy storage capacity in addition to the renewable – wind and solar – installations. Because of the lower pant capacity factors of wind and solar units, the calculations show that significantly higher renewable power capacity must be built than the current capacity of the fossil fuel units to be substituted. Also, that a substantial fraction of the generated energy is lost in the storage-recovery processes. All these factors are expected to increase the price of electricity paid by the consumers. Ahis will have an impact on the less affluent segments of the population and – if ignored by national energy policies – will affect the goal to reduce inequality within and among countries.
Research Article
A Conceptual Design of Energy Harvest from Roadside Trees of a Highway
European Journal of Sustainable Development Research, 2020, 4(1), em0106,
ABSTRACT: An experimental setup is constructed to harvest energy from wind by means of oscillating of a body, structure or even trees. A vertical stem which can oscillate or bend is connected with a rack and pinion and finally pinion is connected with generator to harvest the electrical energy. Once the force is applied on the top of the stem, the connecting wire pulls the rack and pinion is in rotary motion and generates the power. The experiments are carried out for both applied static force and wind assist dynamic force. The experimental results show that the forces exerted on the stem are very much influenced by the stem height, the rack length for power generation. The results from wind assist experiments reveals that the sail size and the materials of both stem and sails play vital role on power generation. The constructed setup shows a good prospect on power generation from wind specially the places like highways, urban areas or any other places where the tree or any other object or structure oscillate.
Research Article
Preliminary Assessment of Noise Pollution Prevention in Wind Turbines Based on an Exergy Approach
European Journal of Sustainable Development Research, 2017, 1(2), 12,
ABSTRACT: Most existing methods for energy transformation and use are inadvertently contaminating our water supplies, releasing greenhouse gasses into the atmosphere, emitting compounds that diminish the earth's protective blanket of ozone, and depleting the earth's crust of natural resources. As a result, scientists and engineers are increasingly pursuing sustainable technologies so that costs associated with global warming can be minimized and adverse impact on living organisms can be prevented. A promising sustainable method is to harness energy from the wind via wind turbines. However, the noise generated by wind turbines proves to be one of the most significant hindrances to the extensive use of wind turbines. In this study, noise generation produced by flow over objects is investigated to characterize the noise generated due to flow-structure interaction and aeroacoustics. As a benchmark, flow over a cylinder has been chosen for this study, with the aim of correlating three main characteristics in noise generation. Hence, the generated sound pressure level, exergy destroyed and the normal flow velocity (∪ ∞) are employed to characterize the system in order to relate the exergy destruction to the noise generated in the flow. The correlation has the potential to be used in wind turbine designs to minimize noise pollution due to aerodynamic noise.