Outdoor airflow analysis and potential for passive cooling in the modern urban context of Dubai

Al-Sallal, Khaled A.; Al-Rais, Laila

doi:10.1016/j.renene.2011.06.046

Cited by 47 publications

(22 citation statements)

References 11 publications

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“…GWTS [30] has proposed several design options to engineer wind flow for better thermal comfort in Melbourne CBD. Additionally, the adoption of lift-up design for the densely built-up area with high rise buildings is advocated recently by several researchers around the world [11,22,53,54] and this applies to Melbourne's CBD conditions. They have demonstrated that this design can favorably influence thermal comfort at the pedestrian level.…”

Section: Geometry and Wind Perceptionsmentioning

confidence: 99%

“…The results of a questionnaire survey in Hong Kong [9] showed that participants were highly sensitive to V a fluctuations. In urban open spaces, it is widely known that recent drastic changes in the design of building density and configuration in cities influence V a profile [5,[10][11][12]. This modifies latent heat flux between human body and the surrounding environment and thereby affecting the thermal comfort conditions in open spaces between buildings.…”

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confidence: 99%

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Perception of Wind in Open Spaces

Shooshtarian

Rajagopalan

2019

Climate

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Dense urbanization influences the livability of cities. Changes in local meteorological conditions can be adverse for human health and well-being. In urban open spaces, it is widely known that changes in building density and configuration in cities influence wind speed (V a ). This influence modifies latent heat flux between the human body and surrounding environment and thereby affecting the thermal comfort conditions in open spaces between buildings. Several studies have demonstrated the significant effect of wind speed on outdoor thermal comfort. Melbourne's Central Business District (CBD) has recently experienced dense urbanization and this pattern of development has instigated noticeable changes in meteorological conditions. Some evidence has suggested that the patterns of wind flow induce thermal discomfort during cool seasons. Conversely, the wind is most welcomed during warm seasons. This study was conducted to assess outdoor users' responses to V a in three open spaces of an educational precinct in Melbourne's CBD. The open spaces studied are different in terms of design and function. Users' responses and meteorological conditions were examined through a series of field measurements and questionnaire surveys from November 2014 to May 2015. This study used three perceptual scales to analyze participants' experience of V a during field surveys: "Bedford preference", "thermal sensation" and "personal acceptability". Analytical results yielded the wind perceptual comfort thresholds for different seasons as well as the entire study period. The results suggested that in addition to the geometry of the urban open space, the function of place could influence people's perceptions of V a . The research findings contribute to developing thermally comfortable outdoor environments.Climate 2019, 7, 106 2 of 17 the factors that significantly influence people's thermal comfort, wind speed (V a ) was found to play a key role in cities and particularly in densely built-up areas and between buildings [5,6].Research on wind comfort perception is underpinned by four major methods: software simulations, field tests, wind tunnel tests and questionnaire survey [6]. Questionnaire survey on people's feeling about wind speed is believed to provide accurate, comprehensive and cost-effective method. Since this method evaluates the impact of four parameters (T a , RH, V a, and T mrt ) it is possible to gain an insight into the impact of V a in comparison with the other three parameters. Several studies have demonstrated the significant effect of V a on outdoor thermal comfort [7][8][9]. For instance, the study by Walton, Dravitzki and Donn [7] revealed that gustiness and V a were the most significant factors in shaping outdoor thermal satisfaction. The results of a questionnaire survey in Hong Kong [9] showed that participants were highly sensitive to V a fluctuations. In urban open spaces, it is widely known that recent drastic changes in the design of building density and configuration in cities influence V a profile [5,[10][11][1...

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Section: Geometry and Wind Perceptionsmentioning

confidence: 99%

mentioning

confidence: 99%

Perception of Wind in Open Spaces

Shooshtarian

Rajagopalan

2019

Climate

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“…These Urban airflow patterns are determined by the interaction between approaching wind within the built environment. Conversely, the pattern of an existing regional wind is changed when it flows through a built environment [20]. The air flowing over urban areas is sub-divided into two main layers.…”

Section: Impacts Of Street Configuration On Airflow For Natural Ventimentioning

confidence: 99%

Effects of Street Geometry on Airflow Regimes for Natural Ventilation in Three Different Street Configurations in Enugu City

Akubue¹

2019

Different Strategies of Housing Design

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Efficient natural ventilation is dependent on the micro climate conditions of an urban environment. This is affected by ambient wind flow, radiation and air temperatures. The airflow within the urban street can be cultivated into two regions. The first is a recirculation region, which forms in the near wake of each building. The Second is a ventilated region downstream of the recirculation region, formed when the street is sufficiently wide. The development of the flow into these two regions depends on geometry. This chapter looks at the impacts of street geometry on these regions of airflow cultivation in three different street configurations in high density residential settlements in Enugu city. It utilized schematic analysis of airflow regimes to identify the behaviors of flow in these street configurations relative to the height and width ratios of the street canyon. This schematic analysis can be utilized in preliminary design studies by city and building designers for justifying street dimensions and configurations in tropical regions where natural ventilation is paramount.

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“…Two-sided windcatcher integrated to wing wall (TWIW) and anti-short-circuiting device (ASCD) [106] and [107].…”

Section: Indoor Air Quality Assessmentmentioning

confidence: 99%

“…Later, Nejat et al [107] added a new device (ASCD) to TWIW to lessen air short circuit beneath windcatcher channels (Fig. 17).…”

Section: Indoor Air Quality Assessmentmentioning

confidence: 99%

A review on windcatcher for passive cooling and natural ventilation in buildings, Part 1: Indoor air quality and thermal comfort assessment

Jomehzadeh

Nejat

Calautit

et al. 2017

Renewable and Sustainable Energy Reviews

182

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Outdoor airflow analysis and potential for passive cooling in the modern urban context of Dubai

Cited by 47 publications

References 11 publications

Perception of Wind in Open Spaces

Perception of Wind in Open Spaces

Effects of Street Geometry on Airflow Regimes for Natural Ventilation in Three Different Street Configurations in Enugu City

A review on windcatcher for passive cooling and natural ventilation in buildings, Part 1: Indoor air quality and thermal comfort assessment

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