Windcatcher Louvers to Improve Ventilation Efficiency

Yang, Young Kwon; Kim, Min Young; Song, Yong Woo; Choi, Sung Ho; Park, Jin Chul

doi:10.3390/en13174459

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…A six-component internal balance is used to measure all forces and moments. The angle blade's attack on which the lift depends is determined by the relative wind direction, the current blade length, and the line angle (Yang et al, 2020). The combination of experimental results assisted by the numerical results from computational fluid dynamics gave sufficient evidence of its fabrication and was used in the blade design.…”

Section: Detailed Methodologymentioning

confidence: 99%

“…Most current airfoils maximize the sub-atmospheric pressure by altering the airflow from the leading edge through a slat. At elevated pressure, the air movement is from the leading edge to the trailing edge until it is pushed at the corner of the vent (Yang et al, 2020). However, aerodynamic efficiency is significantly impaired by disturbances of any kind, such as ice accretion on the blades (Jin et al, 2020).…”

Section: Horizontal Axis Wind Turbinementioning

confidence: 99%

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Performance of a HAWT Rotor with a Modified Blade Configuration

Khan¹,

Singh²,

Sultan³

et al. 2021

JST

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As the world focuses more on clean and green Earth, wind energy plays a significant role. Wind energy is a renewable source of energy that can cope with the ongoing global fossil fuel crisis. The wind energy converters like wind turbines have been studied a lot in terms of design and performance. The current work includes analyzing the output effects of a horizontal axis wind turbine (HAWT) with a modified blade configuration at specific wind speeds. A numerical investigation is carried out using two different numerical software on the chosen airfoil used in blade design validated with the analysis carried out in open-loop wind tunnels. The study is divided into two phases: first, the selected airfoil is tested experimentally and using CFD, and then the findings are compared to those of the University of Illinois Urbana Champaign wind tunnel tests at low Reynolds numbers. The second phase includes the numerical analysis based on the blade element momentum method and non-linear lifting line simulations of modified blade design at high Reynolds number. The numerical results of rotor performance analysis have been compared to existing experimental results. The findings of all numerical investigations agree with those of the experiments. An optimal value of the power coefficient is obtained at a particular tip speed ratio close to the desired value for large wind turbines. For maximum power, this study investigates the optimum pitch angle. The work demonstrated the improved HAWT rotor blade design to produce better aerodynamic lift and thus improve performance.

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Section: Detailed Methodologymentioning

confidence: 99%

Section: Horizontal Axis Wind Turbinementioning

confidence: 99%

Performance of a HAWT Rotor with a Modified Blade Configuration

Khan¹,

Singh²,

Sultan³

et al. 2021

JST

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“…The results reported in [4] suggest that the amount of energy saved using other ventilation modes is not high, representing only 0.03% of common natural ventilation. That is to say, the application of technology to enhance the efficiency of natural ventilation in buildings without an external environment is a way of saving energy in buildings [5]. In the construction industry, building ventilation is one of the most important parameters to be considered in order to maintain a comfortable indoor environment and to provide better indoor air quality [6].…”

Section: Introduction 1the Necessity Of Natural Ventilationmentioning

confidence: 99%

Study on the Influence and Optimization of the Venturi Effect on the Natural Ventilation of Buildings in the Xichang Area

et al. 2021

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Natural ventilation is a way to reduce the energy consumption of building operations and improve the indoor living environment comfort. The venturi cap is designed with a roof, grille and wind deflector to intensify the natural ventilation of buildings. The structural parameters of the venturi cap were designed using an orthogonal design. Fluid analysis software was used for numerical simulation, and variance analysis was used to study the importance of seven influence factors: the width of the roof opening, the roof slope, the height of the wind deflector, the horizontal width of the wind deflector, the angle of the wind deflector, the angle of the grille, and the spacing of the grille slices. The results show that the most significant influencing factor is the width of the roof opening, while significant influence factors include the angle of the grille and the horizontal width of the wind deflector. Additionally, the optimum parameter combination for ventilation performance at the research level was put forward, with the proposed combination achieving a volume flow rate of 5.507 m3/s. The average temperature of the horizontal plane at a height of 1.2 m above the ground was 3.002 K lower than that without a venturi cap, which provides a reference for the optimization of indoor ventilation design in buildings in the Xichang area.

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