Evaluating wind-driven natural ventilation potential for early building design

Cheng, Jin; Qi, Dahai; Katal, Ali; Wang, Liangzhu; Stathopoulos, T.

doi:10.1016/j.jweia.2018.09.017

Cited by 33 publications

(13 citation statements)

References 29 publications

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“…Natural ventilation can help adjust indoor thermal comfort [1][2][3], improve indoor air quality [4,5], and reduce the energy consumption of mechanical ventilation systems [6][7][8]. Due to the pulsating characteristics of natural ventilation, natural ventilation can provide a comfortable indoor environment [9], which is conducive to people's physical and mental health.…”

Section: Introductionmentioning

confidence: 99%

Ventilation Characteristics and Performance Evaluation of Different Window-Opening Forms in a Typical Office Room

Wang

et al. 2021

Applied Sciences

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As most existing office buildings in China lack fresh air systems for ventilation, natural ventilation with windows remains the main means of improving indoor air quality and adjusting indoor thermal comfort. However, knowledge of the ventilation characteristics of various window-opening forms in actual buildings is limited and current methods for evaluating ventilation performance lack a comprehensive consideration of ventilation rate and thermal comfort. In this study, the ventilation characteristics of different window-opening forms were systematically compared by conducting computational fluid dynamics (CFD) simulations. A full-scale experiment was conducted in a typical office room in a university in Tianjin to validate the CFD simulation. Two ventilation modes (wind-driven cross-ventilation and temperature-driven single-sided ventilation), three window-opening angles, and seven window types were investigated. Additionally, the ratio of the ventilation rate to the absolute value of thermal sensation was used to quantify the indoor natural-ventilation performance. The results showed that a sliding window with a full opening has the highest discharge coefficients of 0.68 and 0.52 under wind-driven cross-ventilation and temperature-driven single-sided ventilation, respectively, and top-hung windows opening both inwards and outwards have better ventilation performance than other window types under the two ventilation modes. This study is applicable to the design and practice of natural ventilation.

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Section: Introductionmentioning

confidence: 99%

Ventilation Characteristics and Performance Evaluation of Different Window-Opening Forms in a Typical Office Room

Wang

et al. 2021

Applied Sciences

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“…To make NV more applicable, building designers should be able to predict its performance [6,7]. Therefore, past research [8,9] has focused on investigating the characteristics on NV in an either a general study [10,11] or a case study [12,13].…”

Section: Introductionmentioning

confidence: 99%

Study of Natural Ventilation Performance Relative to Different Wind Directions

Janatifar¹,

Djenidi²,

Ostwald³

2020

Australasian Fluid Mechanics Conference (AFMC)

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This study aims to investigate the effect of wind direction on natural cross ventilation performance. Natural ventilation quantity is compared using Normalized Air Change per Hour (NACH). In addition, fresh air distribution in the breathing level is assessed using Normalized Local Mean Age (NLMA) of air. The study is carried out numerically where the effect of the orientation of a single story building with respect to the wind direction is assessed. Results show that ventilation performance, quantity and fresh air distribution, are best when the openings of the building are fully exposed to the wind and the worst when the openings are parallel to the wind direction.

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“…Rashdi analyzed an ideal building form in relation to lower cooling load and found that additional trees and cool pavements led to the largest reductions in air temperature [16]. Cheng used the computational fluid dynamics (CFD) technique to achieve natural ventilation strategies for early building design [17]. However, in previous studies, the interactive impact of building diversity with major building forms (low-rise, mid-rise, and high-rise) on the thermal balance and micro-climate change under the influence of rapid urbanization is not well documented.…”

Section: Introductionmentioning

confidence: 99%

The Interactive Impact of Building Diversity on the Thermal Balance and Micro-Climate Change under the Influence of Rapid Urbanization

Makvandi

Elsadek

et al. 2019

Sustainability

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Numerous cities face the serious problems of rapid urbanization and climate change, especially in recent years. Among all cities, Wuhan is one of the most affected by these changes, accompanied by the transformation of water surfaces into urban lands and the decline of natural ventilation. This study investigated the impact of surface urban heat island enlargement (SUHI) and block morphology changes in heat balance. Accordingly, the interactive impact of building diversity with major building forms (low-rise, mid-rise, and high-rise) on thermal balance and microclimate changes under the influence of urban land expansion at the residential block scale was studied. To investigate the heat balance changes by air temperature intensification and air movement reduction, a long-term and field observational analysis (1980–2018) coupled with computational fluid dynamic simulation (CFD) was used to evaluate the impact of building diversity on thermal balance. Outcomes show that urban heat island intensity (UHII) increased by 2 ℃ when water surfaces in urban areas decreased; consequently, there was a deterioration in the air movement to alleviate UHII. Thus, the air movement declined substantially with UHII and SUHI enlargement, which, through increased urban surfaces and roughness length, will become worse by 2020. Furthermore, the decline in air movement caused by the transformation of urban water bodies cannot contribute to the heat balance unless reinforced by the morphology of the urban blocks. In the design of inner-city blocks, morphological indicators have a significant impact on microclimate and heat balance, where increasing building density and plot ratio will increase UHII, and increasing water surfaces will result in an increase in urban ventilation. Lastly, a substantial correlation between air temperature and relative humidity was found, which, together with the block indicators, can help control the air temperature and adjust the urban microclimate.

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Evaluating wind-driven natural ventilation potential for early building design

Cited by 33 publications

References 29 publications

Ventilation Characteristics and Performance Evaluation of Different Window-Opening Forms in a Typical Office Room

Ventilation Characteristics and Performance Evaluation of Different Window-Opening Forms in a Typical Office Room

Study of Natural Ventilation Performance Relative to Different Wind Directions

The Interactive Impact of Building Diversity on the Thermal Balance and Micro-Climate Change under the Influence of Rapid Urbanization

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