High-performance building: Sensitivity analysis for simulating different combinations of components of a two-sided windcatcher

Sheikhshahrokhdehkordi, Mohammadamin; Khalesi, Javad; Goudarzi, Navid

doi:10.1016/j.jobe.2019.101079

Cited by 19 publications

(6 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering basic tower designs, various manuscripts study the use of two opening windcatchers. One that works with traditional designs [23], studies around 300 configurations of internal modifications on the wind tower. By adding convergent-divergent nozzles, finned-curved inlet openings and by increasing the size of the dividers between inlet and outlet openings, they manage to increase induced mass flow.…”

Section: Introductionmentioning

confidence: 99%

Analysis of traditional windcatchers and the effects produced by changing the size, shape, and position of the outlet opening

Varela-Boydo

Moya

Watkins

2021

Journal of Building Engineering

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis of traditional windcatchers and the effects produced by changing the size, shape, and position of the outlet opening

Varela-Boydo

Moya

Watkins

2021

Journal of Building Engineering

View full text Add to dashboard Cite

show abstract

“…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]. Hughes and Abdul Ghani [25] provided recommended rates of ventilation air even at low incident wind speeds on a windcatcher using numerical simulations in a small classroom.…”

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

View full text Add to dashboard Cite

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.

show abstract

“…Many are focused on exploring how passive techniques, such as natural ventilation strategies, can be effectively incorporated into the building design [3]. Many works [4][5][6] have shown that natural ventilation and passive cooling strategies can reduce energy consumption during the cooling season and, at the same time, improve the indoor air quality and, in some cases, the comfort level of occupants.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

“…An excellent example of a passive cooling strategy is a windcatcher, which is recently gaining lots of attention due to its capability to provide high fresh air rates and, at the same time, extract stale air out of the building [4][5][6]. The windcatcher utilizes two driving forces to ventilate building spaces: buoyancy forces, which are due to the temperature differential between indoor and outdoor; and wind forces which are due to the pressure differential between the openings [7].…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

Indoor Environmental Quality (IEQ) Analysis of a Two-Sided Windcatcher Integrated with Anti-Short-Circuit Device for Low Wind Conditions

et al. 2020

View full text Add to dashboard Cite

Windcatchers are considered as promising passive ventilation and cooling strategy, but the ventilation performance of this system is still of concern in areas with low speed and unpredictable winds. The air short circuiting in windcatchers can reduce its ventilation performance and ability to introduce clean air and remove stale air. The current work aimed to evaluate the indoor environmental quality (IEQ) performance of a two-sided windcatcher fitted with an anti-short-circuit device (ASCD) for improving its performance in low wind speed conditions. Computational Fluid Dynamics (CFD) simulations were performed for different ASCD configurations. The CFD method was verified using grid-sensitivity analysis and validated by comparing the simulation results with wind tunnel data. The results indicated that the average difference between CFD results and previous experimentation was below 10%, therefore indicating good agreement. Building on the findings of the previous research, the study focused on evaluating the impact of the length of ASCD on the achieved fresh air supply rates and air change rate. The length of the ASCD was varied between 5 cm to 50 cm, while the angle was maintained at 80°. The shorter ASCD was still able to minimize the fresh supply airflow short-circuiting to the exhaust stream, and at the same time, it would also require a smaller ceiling space for installation and lower material cost. Hence, the 15 cm ASCD with 80° angle was selected for further analysis in this study. Then, consideration of low wind speed and various directions were studied to evaluate the ventilation performance of windcatcher with ASCD. The study simulated wind speeds between 0.5–2 m/s and two wind directions. Based on the assessment of IEQ factors, including mean age of air and percentage of dead zone, a 0° incident angle demonstrated slightly better results. The achieved fresh air supply rates ranged between 180 L/s to 890 L/s in 45° wind angle, while, for 0°, these values were from 160 L/s to 642 L/s. Likewise, the range of air change rates (ACH) was from 8 ACH to 32 ACH in 0° wind angle and increased to 9 ACH and then to 45 ACH in 45° wind angle.

show abstract

High-performance building: Sensitivity analysis for simulating different combinations of components of a two-sided windcatcher

Cited by 19 publications

References 36 publications

Analysis of traditional windcatchers and the effects produced by changing the size, shape, and position of the outlet opening

Analysis of traditional windcatchers and the effects produced by changing the size, shape, and position of the outlet opening

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

Indoor Environmental Quality (IEQ) Analysis of a Two-Sided Windcatcher Integrated with Anti-Short-Circuit Device for Low Wind Conditions

Contact Info

Product

Resources

About