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- W2000332367 abstract "Urban heat island can significantly increase the demand for cooling of buildings in cities. This paper investigates one of the main causes of the urban heat island phenomenon, i.e. reduced city ventilation. Two simple Hong Kong city models with relatively complex terrain were considered here under different atmospheric conditions. A 3D RNG k–ɛ turbulence model was used for modeling turbulence effects. The simulation results showed that the influence of thermal stratification can be significant on city ventilation driven partially by thermal buoyancy. When the wind speed is relatively large, the impact of thermal stratification on air flow in city street canyons is minor. When the wind speed is small relative to the buoyancy force, the airflow in the street canyons is dependent on thermal stratification. When there is an adverse vertical temperature gradient, the greater the instability, the stronger the vertical mixing and the greater the flow rate caused by turbulence. The heat and pollutants can easily accumulate under stable atmospheric conditions when there is only a weak background wind or none at all." @default.
- W2000332367 created "2016-06-24" @default.
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- W2000332367 date "2011-05-01" @default.
- W2000332367 modified "2023-10-01" @default.
- W2000332367 title "Thermal conditions and ventilation in an ideal city model of Hong Kong" @default.
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- W2000332367 doi "https://doi.org/10.1016/j.enbuild.2010.06.005" @default.
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