中庭自然通風節能技術之研究

A Study on Energy Saving Techniques for Atrium Natural Ventilation

李宗儒(Zong-Ru Lee)

指導教授 ： 李魁鵬

國立臺北科技大學/機電學院/冷凍空調工程系所/碩士(2006年)

摘要

本論文針對台灣南部地區之辦公大樓，進行自然通風狀態下室內通風效率之探討。本論文採用美國FLUENT Inc.所開發以有限體積法(Finite Volume Method，FVM)為架構的計算流體力學模擬軟體Airpak 2.1，進行電腦模擬分析。台灣地區屬亞熱帶高溫、高濕地區，因此本論文模擬春、夏、秋、冬，四季之外界氣候條件下，探討室內人員舒適指標PMV值、換氣量ACH 值、及通風開口度大小之通風效率分析。
本研究針對位於台南地區之具有採光天窗中庭挑高建築案例，進行自然通風電腦數值模擬解析，探討0.4m~1.0 m之通風引入口大小，對於中庭空間通風之效果。由研究結果顯示台南地區之四氣氣候普遍較溫暖，且該大樓中庭有過大之採光天窗，各季節自然通風所獲得之效益有限。平均而言，以冬季氣候較有通風效益，並且以選擇通風開口度為1m最為適當，可獲得舒適條件的樓層範圍包含2~5樓。因此未來應針對採光天窗之隔熱性、外隔之隔熱性進行改善，並且探討利用排放之冷氣，引入中庭，所產生之廢冷再利用效果。

關鍵字

自然通風 ； 中庭 ； CFD ； PMV ； ACH ； 建築開口

並列摘要

This research is focused on an office building in southern Taiwan and explored the indoor ventilation efficiency of this building under natural ventilation. The thesis adopted the software of computational fluid dynamics program-Airpak 2.1 which is based on FVM (Finite Volume Method, developed by FLUENT Inc. in the U.S.) to execute computer simulation analysis. Since Taiwan is in the subtropical zone where the weather is humid and hot, this research investigates the comfort indexes PMV and ACH for the people inside building according to the outdoor weather conditions in the four different seasons of a year.

The study case is a building with atrium, where is over heated by skylight. The ventilation efficiencies of the atrium with different opening size of 0.4m, 0.6m, 0.8m and 1.0m are simulated. The results indicate that due to the over heated by skylight, the ventilation efficiency is limited in the four different seasons. On average, the effect of ventilation efficiency with the opening mode of 1.0m is better in winter season. In the future, the study will focus on the improvement of ventilation effect by better envelope design, such as insulation promotion and skylight reduction.

並列關鍵字

Natural ventilation ； Atrium ； Insulating glass ； CFD ； PMV ； ACH ； Opening modes

參考文獻

[2] 林憲德，「綠色建築」，2003。

[4] 陳正玲，「垂直導風板對室內自然通風效果影響之研究」，成大碩士論文，2005。

[7] ASHREA/IES Standard 90.1-1999 , Energy Efficient Design of New Buildings Except Low-rise Residential Buildings, American Society of Heating Refrigerating and Air-conditioning Engineers.

[8] ASHREA/IES Stamdard 55-1992 ,Thermal Environmental Conditions for Human Occupancy, American Society of Heating Refrigerating and Air-conditioning Engineers.

[9] ASHRAE Handbook Fundamentals ,2005 , American Society of Heating Refrigerating and Air-conditioning Engineers.