The Design Strategies And Assessment Methods of Pedestrian Areas during Summer - A Study of Chung Cheng Commercial Area
| Autor: | Yi-HsinLiu, 劉怡欣 |
|---|---|
| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 The issue which urban warming resulted from UHI (Urban heat island) has been taken into account in these years because of the population growing, artificial meterials, and heat exhausting. The discussions and coping strategies were also put forward. The increase of shaded area was regarded as one of the most efficient strategies to improve the thermal comfort by human scale.Because the shading could decrease mean radiant temperature, the shade cover area was important outdoor. The focus area was Chung Cheng Commercial Area - a typical business district in Tainan. This study simulated the shaded area of the pedestrian space in focus area during the daytime in summer from 8:00 to 17:00 by CFD (Computational fluid dynamics) models. This study also made the “shade maps of cumulative hours” according the simulation results and anaylsis the shaded area in time and in space. Two assessment methods to estimate the improvement of the shade design strategies were proposed. One methods was the “ shade covers rate” which estimates the improvement of both strategies and both continuity in time and in space. The other was “ thermal comfort index SET*” which assessed the improvement of human comfort. Both short-term and long-term shade design strategies for pedestrian space were established in this study. The strategy 1 was “setting of building shelters”, and strategy 2 was “arrangement street trees”. This study concluded that the strategy 1 could improve the shade cover in pedestrian space in the east-western street sections and during the noon period in all street sections. The strategy 2 could improve the no shaded place in current focus area, and improve the shade cover during both noon and afternoon periods. Both strategies could improve the thermal comfort, after adopting strategy 1, the “shaded movement” decreased about 0.32℃SET*, and strategy 2 decreased 0.12~0.41℃SET*. The long-term shade design strategies suggested the average height of buildings each street section. The average height of buildings front the north-southern, 40m-wide steets shold be over 4 floors high, and 9m-wide ones should built 4~6 floors on east side and 5~6 floors on west side. The average height of buildings front the east-western, 9m-wide steets should be during 5~6 floors high. The strategies and the assessment methods in this study were applied to Tainan. However, according to the results of this study, the assessment methods and the establishment ways of strategis could be used in else area. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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