Effect of windexchanger duct cross-section area and geometry on the room airflow distribution

Cruz-Salas, M.V.; Castillo, José Antonio Lamotte; Huelsz, G.

doi:10.1016/j.jweia.2018.06.022

Cited by 24 publications

(4 citation statements)

References 44 publications

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“…These studies consider only one direction of the wind incident to an isolated room. Three of these are experimental studies with a limited number of cases, for a room with a windward window (Cruz-Salas et al 2014), for a room with a leeward window (Castillo et al 2017) and for both window orientations, analyzing the effect of WE duct cross-section area and geometry (Cruz-Salas et al 2018). The other one is a CFD study where the airflow inside the room is analyzed for one WE configuration, considering four cases: no windows and no thermal buoyancy; no windows and thermal buoyancy; windward window and thermal buoyancy; and leeward window and thermal buoyancy (Liu et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Natural ventilation of an isolated generic building with a windward window and different windexchangers: CFD validation, sensitivity study and performance analysis

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Natural ventilation of an isolated generic building with a windward window and different windexchangers: CFD validation, sensitivity study and performance analysis

et al. 2019

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“…In this study CFD (computational fluid dynamics) modelling is implemented to investigate and analyse the airflow entering a three dimensional room through a two sided windcatcher fitted on its roof. CFD is regarded as a powerful tool to study natural ventilation [45]. A two sided windcatcher, which is the simplest form of windcatchers, is used in this study to concentrate on key parameters affecting the flow rather than complex windcatcher's geometry.…”

Section: Accepted Manuscript N O T C O P Y E D I T E Dmentioning

confidence: 99%

Three-Dimensional Simulation of Wind-Driven Ventilation Through a Windcatcher With Different Inlet Designs

Abdo

Taghipour

Huynh

2019

Journal of Thermal Science and Engineering Applications

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Windcatcher is an effective natural ventilation system, and its performance depends on several factors including wind speed and wind direction. It provides a comfortable and healthy indoor environment since the introduced fresh air decreases the moisture content and reduces the pollutant concentration. Since the wind speed and its direction are generally unpredictable, it is important to use special inlet forms and exits to increase the efficiency of a windcatcher. In this study, computational fluid dynamics (CFD) modeling is implemented using ansys fluent to investigate the airflow entering a three-dimensional room through a windcatcher with different inlet designs. Three designs are studied which are a uniform inlet, a divergent inlet, and a bulging-convergent inlet. The airflow pattern with all inlets provided adequate ventilation through the room. With all the applied wind velocities (1, 2, 3, and 6 m/s) at the domain's inlet, the divergent inlet shape has captured the highest airflow through the room and provided higher average velocity at 1.2 m high enhancing the thermal comfort where most of the human occupancy occurs. With 6 m/s wind velocity, the divergent inlet has captured 2.55% more flow rate compared to the uniform inlet and 4.70% compared to the bulging-convergent inlet, and it has also provided an average velocity at 1.2 m high in the room of 7.16% higher than the uniform inlet and 8.44% higher than the bulging-convergent inlet.

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“…The effect of extension length at the inlet and angle [19,20] revealed that the windcatcher could obtain a 50% higher ventilation effectiveness at a wing wall angle of 30 • compared to a conventional one. Additionally, the height and depth of the windcatcher [21][22][23] were investigated. The ventilation mass flow rate increased by 13% for the two-sided windcatcher with a convergent-divergent nozzle and finned-curved inlet openings [24].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Natural Ventilation Characteristics of a Partial-Cylinder Opening for One-Sided-Windcatcher of Variable Air-Feeding Orientations in Taif, Saudi Arabia

et al. 2021

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To provide a clean and cheap source of natural ventilation in windy and arid zones, a windcatcher facility is the best option. This paper aims to study the effect of the inlet opening angle of a new windcatcher model with different values ranging from 60° to 90° for three different feeding orientations at leading-down, central-up, and trailing-down locations. The ventilation performance of the new one-sided windcatcher is numerically examined using CFD simulations, where the 3D RANS and k-epsilon equations are applied at different wind speeds. The flow features of the new models are analyzed and compared with a basic traditional model based on the induced air distribution, aerodynamic losses, and ventilation rates. Results revealed that the sharp edge of the inlet opening leads to an increase in the flow separation and recirculation zone, especially when the opening angle is increased. The highest pressure coefficient is achieved by the trailing-down model compared with the other windcatcher models at an opening angle of 90°. The total pressure drop and ventilation rates increase in all the new windcatcher models due to the increase in the opening angle from 60° to 90°. At identical conditions, with an opening angle of 90° and wind speed of 5 m/s, the trailing-down model achieved a higher pressure coefficient than the leading-down and central-up models by 20.55% and 37.37%, respectively. Furthermore, the trailing-down model could provide higher ventilation rates than the central-up and leading-down models by 31% and 42%, respectively. Finally, the trailing-down windcatcher model can be recommended as the best choice to provide natural ventilation at Taif City in Saudi Arabia.

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Effect of windexchanger duct cross-section area and geometry on the room airflow distribution

Cited by 24 publications

References 44 publications

Natural ventilation of an isolated generic building with a windward window and different windexchangers: CFD validation, sensitivity study and performance analysis

Natural ventilation of an isolated generic building with a windward window and different windexchangers: CFD validation, sensitivity study and performance analysis

Three-Dimensional Simulation of Wind-Driven Ventilation Through a Windcatcher With Different Inlet Designs

Numerical Study on Natural Ventilation Characteristics of a Partial-Cylinder Opening for One-Sided-Windcatcher of Variable Air-Feeding Orientations in Taif, Saudi Arabia

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