太陽能源對於建築物具有決定性的影響，不僅針對建築外部，對於建築物內部亦然，尤其在熱帶與副熱地區更是影響甚鉅。利用裝設在外部的百葉裝置可比裝設在室內的百葉裝置更為有效地隔離太陽輻射避免輻射熱進入到室內。另一方面外部的百葉裝置亦可調整晝光的強度與室外風速俾使達到良好且舒適的室內環境品質。本研究主要以台北教室做為研究對象，並利用ECOTECT/RADIANCE trial version package以及PHOENICS Computation Fluid Dynamics (CFD) 兩套模擬軟體分別來檢討其在搭配不同形式的外部百葉裝置時對於室內晝光與氣流之影響。主要先以室內均齊度為基礎檢視常見百葉裝置的形式設計之優劣，再討論當風通過百葉裝置時氣流分部的情形，可發現百葉裝置之尾端為影響通過氣流的關鍵因子。因此透過上述初步的研究，再加上太陽熱得之情形，本研究重新組織並設計百葉裝置之形式來進行討論其分別在室內均齊度、風速以及兩者綜合的表現。結果顯示採用 ‟ W ” 形狀百葉裝置的室內照明均齊度最佳，採用 ‟ self dropping ” 形式百葉裝置的室內風速較高，而 ‟ ellipse ” 形狀的裝置則是綜合考慮室內均齊度及風速時，較佳的形式。因此根據模擬之結果可知主要影響晝光照度的因素為百葉裝置的曲線，影響進風風速的關鍵因素則是為百葉裝置的尾段角度，若能適當地結合此兩種特性必能創造出可同時滿足良好晝光與自然通風的百葉形式，然要同時讓兩者皆達到最理想化的百葉設計並不容易，因此仍需重新檢視並衡量室內之需求，再適當結合上述的百葉裝置特性，才能找出最合宜的百葉形式。

The most significant element affecting the architectural environment in the tropical and subtropical region is solar energy, which influences either its inside or outside the buildings. External louvers can be utilized to block the solar radiation before it reaches the indoor environment, hence, more effective than internal louvers system. On the other hand, external louvers will reduce the daylighting intensity, wind velocity as well as the air change rate inside the buildings. This study discusses the impacts of several different prototypes of external louvers in a classroom in Taipei via the use of ECOTECT/RADIANCE trial version package for daylighting and PHOENICS Computation Fluid Dynamics software for natural ventilation simulations. The preliminary study of louver design based on daylighting, while natural ventilation is unpredictable; hence the advanced study of airflow through louvers was essential and implemented, the effect of louver tails was discovered. The new louvers for advanced study of daylighting and ventilation were re-organized with the concern of solar heat gain. The results showed that the w-shape and the curve part influences on daylighting illuminance while the louver tail’s angle obviously affects the wind velocity. The combination of these two elements may create a better louver type, even if it is not so easy to create the optimal louvers on both daylighting and ventilation. Finally, summarizes the results of this work and indicates future work required to figure out the best louver geometry and the influences on louvers for indoor air quality.

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