全球節能減碳的環保意識日漸抬頭，研究替代能源如太陽能、氫能、風能、水能…等已成為所有人類共同的趨勢。在諸多替代能源系統中，本實驗室以太陽光節能為目標，研究開發高品質的自然光照明系統，有效將太陽光直接做為照明使用。近年來，綠建築概念蓬勃發展，其中採光率為一重要指標，但在現今大樓林立之都市中，實體窗戶採光率不佳以及地下或封閉空間需要大量耗能的照明燈具，因此為了營造節能且舒適的照明環境，本論文提出一個運用在封閉空間的情境窗戶，此窗戶結合自然光照明系統與人工光源(LED)作為光源，用來解決自然光照明系統因為太陽光位置不同而造成輸出能量不穩定及實際窗戶採光率低之問題，同時營造出穩定且節能之照明環境。
此外，此情境窗戶採用空心設計並結合非成像光學，將自由曲面配上微結構變化，使得不同光源搭配和轉換時，皆能以相同的配光曲線輸出，並達到62%均勻的效果和75%的室內照明效率，藉由此設計讓封閉室內空間有高節能及高舒適的環境，往後也可搭配感應器去分辨室外情境。

Nowadays the green building has been increasingly importance attached people's attention in architectural designed; among the lighting of considered the natural lighting is most influential factor. Therefore, the architectural design was used a lot of windows to interior lighting and enhancing indoor comfort. But most crowded cities have construct skyscrapers in developing countries, which let the traditional window lighting to affect limited. The day lighting illumination system called Natural Light Illumination System (NLIS). This system can be used to guide the natural light indoors for illumination. In this paper, we present a novel design of the light-emitting sub-system of NLIS, based on freeform micro-structure, to guide the light to a confined space such as an underground basement. The sub-system we design combines the natural light and LED as the input, performs similar function as a regular window, namely a self-illuminating window. This innovative design steadily provides indoor illumination of 62 % uniformity and 75% efficiency.

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