Planting trees around buildings has always been used as one of the most common viable landscaping strategies in schools.However,the impact of trees on natural ventilation inside the building has been neglected without...Planting trees around buildings has always been used as one of the most common viable landscaping strategies in schools.However,the impact of trees on natural ventilation inside the building has been neglected without investigation.The emphasis of this study related to the impact of outdoor trees around the academic building on indoor ventilation.Numerical simulations of the indoor wind environment of the academic building affected by trees were performed utilizing the k-εmodel with additional source terms.The numerical model was also validated by measured data.Two kinds of trees were selected,they are camphor and metasequoia.Camphor is a kind of broad-leaved tree and metasequoia is a kind of coniferous tree.26 simulation cases with six different tree canopy spacings were conducted.These results showed that the outdoor trees had great influences on the natural ventilation performance of the academic building.Compared with the case without the trees,the highest decrement in ventilation flow rate could be up to 31.97%in this study.For the cases of classrooms with horizontal distribution,the ages of air of the classrooms became fresher with the increase of the canopy spacing.While for the cases of classrooms with vertical distribution,the canopy spacing had fewer effects on the natural ventilation performances.It was also found that the blocking effects of camphor on indoor ventilation were higher than that of metasequoia.The average ventilation flow rate in cases with metasequoia was increased by 14.89%compared to the cases with camphor.This study could provide guidance for the layout design of trees around the building.展开更多
基金supported by Ministry of Science and Technology of China (No.2020YFC1522304)the Natural Science Foundation of China (No.52078118)the Opening Fund of State Key Laboratory of Green Building in Western China (No.LSKF202107).
文摘Planting trees around buildings has always been used as one of the most common viable landscaping strategies in schools.However,the impact of trees on natural ventilation inside the building has been neglected without investigation.The emphasis of this study related to the impact of outdoor trees around the academic building on indoor ventilation.Numerical simulations of the indoor wind environment of the academic building affected by trees were performed utilizing the k-εmodel with additional source terms.The numerical model was also validated by measured data.Two kinds of trees were selected,they are camphor and metasequoia.Camphor is a kind of broad-leaved tree and metasequoia is a kind of coniferous tree.26 simulation cases with six different tree canopy spacings were conducted.These results showed that the outdoor trees had great influences on the natural ventilation performance of the academic building.Compared with the case without the trees,the highest decrement in ventilation flow rate could be up to 31.97%in this study.For the cases of classrooms with horizontal distribution,the ages of air of the classrooms became fresher with the increase of the canopy spacing.While for the cases of classrooms with vertical distribution,the canopy spacing had fewer effects on the natural ventilation performances.It was also found that the blocking effects of camphor on indoor ventilation were higher than that of metasequoia.The average ventilation flow rate in cases with metasequoia was increased by 14.89%compared to the cases with camphor.This study could provide guidance for the layout design of trees around the building.
