研究生: |
許志毅 Zhi-yi Xu |
---|---|
論文名稱: |
室內環境自然對流研究-熱源高度位置與室內流場之關係(實驗室縮小模型) Nautral convection in an indoor environment - a study on the inflence of the position of a heat source on indoor flow field. (Laboratory reduced scale model) |
指導教授: |
陳鴻銘
Hung-Ming Chen 林怡均 Yi-Jiun Lin |
口試委員: |
朱佳仁
none 陳瑞華 none 陳明志 none |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 營建工程系 Department of Civil and Construction Engineering |
論文出版年: | 2008 |
畢業學年度: | 96 |
語文別: | 中文 |
論文頁數: | 123 |
中文關鍵詞: | 熱源高度 、通風 、熱升流 |
外文關鍵詞: | heat source position, ventilation, thermal plume |
相關次數: | 點閱:127 下載:9 |
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一般建築的室內空間大部分因為通風設計不佳普遍裝有空調設備,
然而空調設備在現代建築中是一項主要耗能的要素。
本論文的研究目的為研究建築結構物的自然通風機制,
以自然通風的方式調節室內溫度。
室內空間的主要使用區域大部分位於該空間的下層,
為了能夠有效利用自然通風調節室內溫度,
所以將室內溫度的控制專注於下層溫度的調節。
本研究探討不同熱源高度與室內空間上、下層溫度和流場的關係。
觀察室內流場及溫度場相對應之變化,
研究利用基礎點熱源理論(plume theory)推導點熱源強度和對流強度的關係,
以實驗室縮小長方體壓克力箱模擬室內空間環境。
並將此一模型置於一環境水槽中,
藉由改變熱源高度與室內空間的高度比,
量測室內對流的溫度分佈與流場變化。
並以理論公式估算,
室內對流達到穩態時,
上層空間溫度和交界面位置。
經由理論和實驗的結果可以知道隨著熱源高度越高,
上層空間的溫度越高,
上下層空間的交界面高度也越高,
室內空間在開口處的流量則越低。
熱源置於高處可以減少熱源影響下層空間溫度,
使下層非高溫區域高度更高,
但通風量減少,
上層溫度增高。
The interior spaces of most architectures are usually equipped with air-conditioning systems because of poor ventilation designs, but the air-conditioning system in modern buildings is a major energy-consumer. The purpose of this paper is to study the natural ventilation system in an indoor environment. Since most of activities of occupants happen in the lower layer of the space, the control of natural ventilation will focus on the temperature regulation of the lower space. This study discusses the relationship between different heat source heights and the indoor flow fields. Theoretical analysis based on the plume theory is derived to investigate the relationship between positions of point heat sources and indoor ventilation. Using a reduced-scale rectangular acrylic box and placing this acrylic model in an environment tank to simulate an indoor space in a constant environment. I change the vertical height of the heat source, and observe the corresponding indoor flow and temperature. In the experiments, I could estimate the indoor temperature, and determine the interface height when steady state attains. This study shows that the higher of the heat source position, the higher of the upper space temperature. The higher of the heat source position causes the lower exchange volume flux of the indoor space.
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