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研究生： 吳愛琳
Karina - Natali
論文名稱： 辦公大樓中庭空間浮力通風於春季之效益
An Investigation of Stack Ventilation Performance for a Building Project in Spring Season Condition
指導教授： 江維華
Wei-Hwa Chiang
口試委員: 林怡均
Yi-Jiun Lin
張杰
Chang,Chieh
學位類別： 碩士
Master
系所名稱： 設計學院 - 建築系
Department of Architecture
論文出版年： 2013
畢業學年度： 101
語文別： 英文
論文頁數： 89
中文關鍵詞： 自然通風 、辦公建築 、浮力效應 、熱舒適度 、中庭設計
外文關鍵詞： atrium design, multiple stacks, stack effect
相關次數： 點閱：229  下載：8 
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    • 本研究主要運用CFD(computational fluid dynamics)評估預測位於台北之辦公大樓挑空中庭的浮力通風效益，此大樓分有上下兩組中庭煙囪，兩組造型略有不同，上組為垂直直通向上，下組則是向大樓南向傾斜。本研究除證明此兩組中庭煙囪之設計可以有效產生浮力效應外，亦檢視此浮力效應能有效率地將室內的熱經過中庭煙囪出口排至室外，使室內達到舒適範圍。
    本研究外氣條件主要設定在可採用自然通風時的春、秋季，外氣溫度約為20度，且為減少影響浮力通風之變因，建築物外部風場設定為無風狀態，中性軸的高度、室內氣流模式、風速與溫度層化現象會被用來檢視作為評估室內室適度之依據。
    本研究依據初步模擬結果針對室內蓄熱區域以及下組煙囪偏低的中性軸高度，提出改善設計手法，使當外氣溫度在20度至24度時，室內環境皆可達到舒適範圍內。

    This study examines the stack ventilation performance of an office building located in Taipei, Taiwan. Atriums in this building act as stacks that facilitate buoyancy-driven ventilation. Computational Fluid Dynamic (CFD) simulations are used to identify interior airflow patterns, and then used these patterns to assess the building’s heat expulsion efficiency. Ambient temperatures between 20°C and 24°C were adopted as the typical seasonal spring temperature range in Taipei. Further, “zero-wind” conditions are established to ensure simulation results reflected only the buoyancy effect. After checking results against neutral pressure level (NPL) level, airflow, air velocity, and indoor temperature stratification, the lower stack is modified to reduce the NPL in order to remove heat accumulated on the top floor.

    ACKNOWLEDGEMENT i ABSTRACT iii ABSTRACT (中文) iv TABLE OF CONTENTS v LIST OF FIGURES viii LIST OF TABLES xii CHAPTER I 1 1.1 OVERVIEW 1 1.2 SUBJECT INTRODUCTION 2 1.3 RESEARCH OBJECTIVES 7 1.4 RESEARCH ASSUMPTIONS 7 1.5 DEFINITIONS 8 1.5.1 Neutral Pressure Level 8 1.5.2 Occupant Comfort Zone 9 CHAPTER II 10 2.1 RESEARCH METHODOLOGY 10 2.2 CFD SETTING 12 2.2.1 Temperature Setting 12 2.2.2 Heat Source Setting 13 2.2.3 Boundary and Domain Setting 14 CHAPTER III 16 3.1 SETTING VALIDATION 16 3.1.1 Lower Stack Case 18 3.1.2 Upper Stack Case 20 3.2 GRID SENSITIVITY VALIDATION 23 CHAPTER IV 25 4.1 UPPER STACK ANALYSIS 26 4.1.1 Vertical Distribution Analysis 26 4.1.2 Horizontal Distribution Analysis 28 4.1.3 Summary 30 4.2 LOWER STACK ANALYSIS 31 4.2.1 Vertical Distribution Analysis 31 4.2.2 Horizontal Distribution Analysis 33 4.2.3 Summary 36 CHAPTER V 37 5.1 LOWER STACK CONSIDERING SOLAR RADIATION FACTOR 37 5.1.1 Improvement Analysis 37 5.1.2 Summary 39 5.2 LOWER STACK WITH EXTRA CHIMNEY HEIGHT 40 5.2.1 Improvement Analysis 40 5.2.2 Summary 45 5.3 LOWER STACK WITH EXTRA VENT 46 5.3.1 Improvement Analysis 46 5.3.2 Summary 53 CHAPTER VI 55 6.1 CONCLUSION 55 6.2 FUTURE WORKS 56 REFERENCES 57 APPENDIX I 58 APPENDIX II 59 APPENDIX III 60 APPENDIX IV 72 APPENDIX V 74 APPENDIX VI 76

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