Numerical evaluation of louver configuration and ventilation strategies for the windcatcher system

Liu, Shichao; Mak, Cheuk Ming; Niu, Jianlei

doi:10.1016/j.buildenv.2011.01.025

Cited by 61 publications

(39 citation statements)

References 41 publications

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“…The amount of heat absorbed in the process of water evaporation is very high in comparison with other modes of heat transfer common in buildings. A 500mm square wind catcher system connected to the room has been modeled for different wind speeds in the range of 0.5-6 m/s and four different wind directions [17].The numerical results generally agree with the published experimental results of a wind tunnel experiment. The numerical results demonstrate that the wind catcher performance is greatly influenced by the external wind speed and direction with respect to the wind catcher quadrants.…”

Section: Previous Worksupporting

confidence: 71%

Performance Evaluation of Four-Sided Square Wind Catchers with Different Geometries by Numerical Method

Ghadiri

Ibrahim

Mohamed

2013

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Abstract. The extensive enhance of using air conditioning to cool and ventilate buildings in hot -arid climate regions have turned into an actual crisis since these systems consume high load of electricity. Recently, green ventilation features such as wind catchers have been utilized as a solution in order to improve indoor air quality and decrease energy consumption. The most common ventilation device in hot and hot-humid areas of Iran was wind catcher or "Badgir". This study is an outline of the results of a research on the wind catcher element in the traditional architecture of Iran. An appraisal of the wind towers' individuality with prominence on their morphology is presented and classification of the wind towers based on their physical characteristic and parameters are thus proposed. This paper also presents a limited wind driven simulation results which shows the impact of different square wind catcher's plan geometry on the indoor ventilation rate. The simulations accomplished using computational fluid dynamics (CFD), reveal the effect of four different square wind catchers on the indoor ventilation rate.

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Section: Previous Worksupporting

confidence: 71%

Performance Evaluation of Four-Sided Square Wind Catchers with Different Geometries by Numerical Method

Ghadiri

Ibrahim

Mohamed

2013

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“…The CTSW has similar geometry to TWIW (Fig.4) but with internal louvers in openings because louvers are a common component of the new conventional windcatchers [15]. The number and angle of the louvers were 6 and 35° which were selected based on the optimum as detailed in references [19] and [28]. Based on the winddata of Malaysia, the predominant directions of the wind were northeast and southwest with an average of 2.5 m/s [29], [30] and [31].…”

Section: Experimental Procedures and Wind Tunnel Set-upmentioning

confidence: 99%

“…For this reason, most of the pervious investigations studied windcatcher in medium to high wind speed (3 to 5 m/s) conditions such as [18] and [19]. Therefore, in some regions where the speed of ambient wind is low (e.g.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a two-sided windcatcher integrated with wing wall (as a new design) and comparison with a conventional windcatcher

Nejat

Calautit

Majid

et al. 2016

Energy and Buildings

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In buildings, 60% of energy consumption is associated to HVAC systems. One solution to reduce this share is the application of natural ventilation systems. Windcatcher and wing wall are two well-known techniques for natural ventilation which have been used in different regions. Nevertheless, in areas with low wind speed such as tropical climate of Malaysia there is hesitation for application of natural ventilation systems. The integration of windcatcher with wing wall can potentially enhance the ventilation performance. However, this configuration was not looked into by pervious investigations; thus, this study aims to address this gap of research by evaluating: first, the effect of wing wall angle on the ventilation performance; second, comparethe performance of this new design with a conventional windcatcher. This research had two main investigative steps: experimental scaled wind tunnel testing and CFD simulation. Four reduced-scale models of two-sided windcatcher were tested in a low speed wind tunnel. Three models were integrated with wing wall in 30°, 45° and 60° incident angles and the another windcatcher was a conventional two-sided windcatcher, which is typical in regions with predominant wind direction. The CFD validation against experiment showed a good agreement. The best operation was observed in the windcatcher with 30° wing wall angle which could supply 910 l/s fresh air into the room in 2.5 m/s wind speed. Hence, the new design had 50% more ventilation performance comparing with conventional two-sided windcatcher in the same external wind speed. Finally, it was concluded that this new design can satisfy requirements of ASHRAE 62.1.

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“…Liu et al (15) found that the optimal number of louvers in the design of a wind tower was found to be between 6 and 8. Beyond this value the airflow rate did not increase by a significant amount to warrant the additional material.…”

Section: Previous Related Workmentioning

confidence: 99%

A study of passive ventilation integrated with heat recovery

O’Connor

Calautit

Hughes

2014

Energy and Buildings

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To meet the demand for energy demand reduction in heating, ventilation and air-conditioning systems, a novel design incorporating a heat recovery device into a wind tower was proposed. The integrated system uses a rotary thermal wheel for heat recovery at the base of the wind tower. A 1:10 scale prototype of the system was created and tested experimentally in a closed-loop subsonic wind tunnel to validate the Computational Fluid Dynamics (CFD) investigation. Wind towers have been shown to be capable of providing adequate ventilation in line with British Standards and the Chartered Institution of Building Services Engineers (CIBSE) guidelines. Despite the blockage of the rotary thermal wheel, ventilation rates were above recommendations. In a classroom with an occupancy density of 1.8m 2 /person, the wind tower with rotary thermal wheel was experimentally shown to provide 9L/s per person at an inlet air velocity of 3m/s, 1L/s per person higher than recommended ventilation rates. This is possible with a pressure drop across the heat exchanger of 4.33Pa. In addition to sufficient ventilation, the heat in the exhaust airstreams was captured and transferred to the incoming airstream, raising the temperature 2°C, this passive recovery has the potential to reduce demand on space heating systems.

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Numerical evaluation of louver configuration and ventilation strategies for the windcatcher system

Cited by 61 publications

References 41 publications

Performance Evaluation of Four-Sided Square Wind Catchers with Different Geometries by Numerical Method

Performance Evaluation of Four-Sided Square Wind Catchers with Different Geometries by Numerical Method

Evaluation of a two-sided windcatcher integrated with wing wall (as a new design) and comparison with a conventional windcatcher

A study of passive ventilation integrated with heat recovery

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