- 學位論文
The Influence of Community Planning on Urban Thermal Environment
The Influence of Community Planning on Urban Thermal Environment
摘要
The purpose of this study is to examine the possibility of urban design in the aspects of building envelope, arrangement and height to improve the wind and thermal conditions in buildings area on urban community scale in hot-humid climate region. The study compares different urban designed options for a site in Thanh Hoa city, Viet Nam on the micro-climate conditions. The designed options are computationally simulated by two models CFD-ACEs V2006 and ENVI-met 3.1 in order to calculate the potential wind field and air temperature. Comparison of simulating results shows that the well-designed option for urban community could improve wind and thermal condition by taking advantages of wind channeling effect, Venturi effect, right direction of building to reduce air stagnations, as well as a suitable building height strategy. - Wind channeling effect could drive wind into and through all streets in community as well as gather air flows to certain place to speed up the wind in that place, reducing the air temperature in street about 2 degrees. - Suitable building direction can significantly reduce stagnant areas in front of or between buildings, lessening the temperature 2 degrees at same position. - The Venturi effect appeared in the “Ventury shape” street could increase wind speed at narrower section, make its temperature 1.5 degrees lower that at the street entrance. - Down-flow in the step-up canyon produces diverged flow from mid of canyon to canyon entrances, while up-flow in the step-down canyon can induce the converged flow from canyon entrances into canyon before is pulled out through canyon roof level. - Net effect of intersections, where connect the step-up and step-down canyons with wind-parallel street, makes the air temperature generally decreases 1 to 2 degree due to well-mixing of cool air and releasing of heated air out of urban area.
並列摘要
The purpose of this study is to examine the possibility of urban design in the aspects of building envelope, arrangement and height to improve the wind and thermal conditions in buildings area on urban community scale in hot-humid climate region. The study compares different urban designed options for a site in Thanh Hoa city, Viet Nam on the micro-climate conditions. The designed options are computationally simulated by two models CFD-ACEs V2006 and ENVI-met 3.1 in order to calculate the potential wind field and air temperature. Comparison of simulating results shows that the well-designed option for urban community could improve wind and thermal condition by taking advantages of wind channeling effect, Venturi effect, right direction of building to reduce air stagnations, as well as a suitable building height strategy. - Wind channeling effect could drive wind into and through all streets in community as well as gather air flows to certain place to speed up the wind in that place, reducing the air temperature in street about 2 degrees. - Suitable building direction can significantly reduce stagnant areas in front of or between buildings, lessening the temperature 2 degrees at same position. - The Venturi effect appeared in the “Ventury shape” street could increase wind speed at narrower section, make its temperature 1.5 degrees lower that at the street entrance. - Down-flow in the step-up canyon produces diverged flow from mid of canyon to canyon entrances, while up-flow in the step-down canyon can induce the converged flow from canyon entrances into canyon before is pulled out through canyon roof level. - Net effect of intersections, where connect the step-up and step-down canyons with wind-parallel street, makes the air temperature generally decreases 1 to 2 degree due to well-mixing of cool air and releasing of heated air out of urban area.