本文以封閉稜柱型空腔與加熱片模擬屋頂閣樓與日照，並結合相變化材料、隔板以及穿孔等變因探討內部之流場趨勢與熱傳特徵。
以最小平方法配合實驗數據推估未知熱源Q，藉此設定模擬之熱源使其結果符合實驗數據。再將各紊流模型之CFD結果分別與實驗溫度點進行比較，得到最適切之紊流模型。
以經驗公式計算之熱流係數與和各紊流模型之數值結果相互比較，可以發現zero equation之誤差最小。其溫度點與實驗結果之方均根誤差僅有0.6%，故以此紊流模型做本文之後續分析。最後以所選擇之模型進行模擬，將實驗不易獲得之熱傳特性計算而出，且透過後處理進一步將計算結果之溫度分布圖與速度分布圖呈現，並進行流場趨勢分析與探討。
大傾斜角之熱對流係數相較於小傾斜角之值提高約10%，且隔板頂部流場之速度提升明顯，對流效應較佳。且隔板穿孔將形成煙囪效應造成明顯之上升氣流，穿孔大小對於隔板上方熱對流效應呈正相關。以空氣傳熱給相變化材料之效能微乎其微，且其設置位置應進行深入探討。
此研究能夠對被動式建築之設計提供節能方法，呼應越發緊張之能源危機。

In this article, a closed prismatic cavity and heating fins are used to simulate the attic and sunlight on the roof, and the internal flow field trend and heat transfer characteristics are discussed in combination with variables such as phase change materials, partitions, and perforations.
Estimate the unknown heat source Q by using the least squares method with the experimental data, so as to set the simulated heat source so that the result conforms to the experimental data. Then compare the CFD results of each turbulence model with the experimental temperature points to obtain the most suitable turbulence model.
Comparing the heat flow coefficient calculated by the empirical formula with the numerical results of various turbulent flow models, it can be found that the error of the zero equation is the smallest. The root mean square error between the temperature point and the experimental results is only 0.6%, so this turbulent flow model is used for subsequent analysis in this paper.
The heat convection coefficient of the large inclination angle is about 10% higher than that of the small inclination angle, and the speed of the flow field at the top of the partition is significantly improved, and the convection effect is better. And the perforation of the partition will form the chimney effect and cause obvious updraft, and the size of the perforation is positively correlated with the thermal convection effect above the partition. The efficiency of heat transfer to phase change materials with air is negligible, and its placement should be further investigated.
This research can provide energy-saving methods for the design of passive buildings, responding to the increasingly tense energy crisis.

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