|Title:||On the study of the effect of building and road canyon geometry on thermal comfort|
|Subject:||Hong Kong Polytechnic University -- Dissertations|
Buildings -- Aerodynamics
|Department:||Department of Building Services Engineering|
|Pages:||xi, 87 pages : color illustrations|
|Abstract:||Hong Kong's transport is very convenient, so most people walk to the subway station or bus station or even get to their destination on foot. At the same time, people also like going outside to do some outdoor sports, enjoy some recreational activities and so on. However, Hong Kong is a small city with small area and more population, so the building density is higher. Hong Kong based on the special urban planning which has formed a relatively unique architectural appearance. If the high divided by the width is greater than one, it can form a canyon. During summer, the high building density reduces the average wind speed and leads to heat island effect. It affects people's comfort. The main purpose of this thesis is to investigate the effect of changes in building aspect ratio and building spacing on outdoor thermal comfort of pedestrians. This dissertation presents the results of an outdoor thermal comfort study conducted in Hong Kong, through CFD simulation and PMV calculation. Therefore, in this paper, RHINO and ICEM software were adopted for formulating models and creating grids respectively. Meanwhile, with aid of fluent calculation analysis (CFD) software, thermal comfort factors should be comprehensively analyzed and PMV is used to assess thermal comfort. Finally, after analyzing several different scenarios, it is found that the effect of aspect ratio change on outdoor thermal comfort is greater than the comfort bought about by the change of building spacing in street canyon. Through the comparison and analysis of PMV results, when the aspect ratio is 6, the PMV values can be controlled below 3 and the outdoor environment is under acceptable conditions without overheating. Results showed which kind of building arrangement could improve the thermal comfort of pedestrians. This discovery can help to remind city planners to make good design in the future. It also encourages people do more outdoor activities and enhance people's thermal comfort.|
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