Study on Effect of Opening Area Ratio and Relative Opening Location on Air Flow Characteristics in Cross-Ventilation Models

Hiyama, Kyosuke; Kato, Shinsuke; Takahashi, Takéo; Kono, Ryohei

doi:10.3130/aije.70.21_2

Cited by 3 publications

(1 citation statement)

References 6 publications

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“…For example, natural ventilation rates depend on various factors such as the shape of the target building, opening condition, and wind direction [1,2]. Studies on indoor air-flow fields for natural ventilation include numerical simulations [3][4][5][6] and experiments [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Turbulence Effect of Urban-Canopy Flow on Indoor Velocity Fields under Sheltered and Cross-Ventilation Conditions

et al. 2021

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Understanding the characteristics of natural, wind-induced ventilation of buildings is essential for accurate predictions of ventilation flow rates; however, indoor ventilation is significantly influenced by surrounding buildings. Therefore, a series of wind-tunnel experiments were performed to clarify the relationship between outdoor and indoor air flows around and within a target cube model with several openings. Two surrounding building arrangements, namely square (SQ) and staggered (ST), were placed under the condition of a building coverage ratio of 25%. The results indicated that the wind speed near the windward openings on the streamwise faces showed 0.3 to the reference wind speed, whereas those on the lateral faces were less than 0.1; these numbers indicate that the opening positions significantly affect the mean indoor wind speed. Furthermore, the temporal fluctuations of velocities near the opening demonstrated that the introduction of the flow is significantly affected by turbulent flow due to the surrounding buildings. In addition, correlation between the outdoor and indoor air flows was observed. The highest correlations were obtained for both opening conditions with a certain temporal delay. This result indicates that indoor air flows become turbulent because of the turbulent flows generated by the surrounding outdoor buildings; however, slight temporal delays could occur between indoor and outdoor air flows. Although the present study focuses on the fundamental turbulent characteristics of indoor and outdoor air flows, such findings are essential for accurately predicting the ventilation flow rate due to turbulent air flows for sheltered buildings.

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Section: Introductionmentioning

confidence: 99%

Turbulence Effect of Urban-Canopy Flow on Indoor Velocity Fields under Sheltered and Cross-Ventilation Conditions

et al. 2021

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Integrated Evaluation of Solar-Shading Devices for the Indoor Climate Controllability by Cross Ventilation and Solar Shading

Miwa

Sawachi

Kurayama

et al. 2007

Nihon Kenchiku Gakkai Kankyokei Ronbunshu

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130 Year History of Building Natural Ventilation Research in Japan － a Narrative Review

Kobayashi

2018

Journal of Environmental Engineering (Transactions of AIJ)

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This article gives a brief history of building natural ventilation research over 130 years in Japan based on the author's perspective, aiming to provide a bac ground for researchers in this eld The scienti c research on ventilation as rst seen in the 1 0s and it had been studied mainly in the eld of public health research until the 1 0s any or s came to be seen in the architectural engineering after ard, and it is no adays regarded as a mature research eld The article concludes ith an interpretation of the meanings and importance of the research or s conducted in such a ell-developed eld

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Study on Effect of Opening Area Ratio and Relative Opening Location on Air Flow Characteristics in Cross-Ventilation Models

Cited by 3 publications

References 6 publications

Turbulence Effect of Urban-Canopy Flow on Indoor Velocity Fields under Sheltered and Cross-Ventilation Conditions

Turbulence Effect of Urban-Canopy Flow on Indoor Velocity Fields under Sheltered and Cross-Ventilation Conditions

Integrated Evaluation of Solar-Shading Devices for the Indoor Climate Controllability by Cross Ventilation and Solar Shading

130 Year History of Building Natural Ventilation Research in Japan － a Narrative Review

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