近年來，愈來愈多建築採用金屬擴張網作為立面的設計元素，除了具備造型上的美感同時也提供遮陽效果。並且已有熱帶、亞熱帶地區國家在建築節能規範中評估其節能效益，如臺灣、新加坡。然而，國內文獻指出由於金屬擴張網的三維開孔型式使其實際透過率較水平開口率所定義之遮陽效果佳。另一方面，阻擋日射的同時造成光環境品質降低，因此有國外文獻指出特定開口率的沖孔遮陽板能同時兼顧兩者。
本研究目的為評估金屬擴張網對建築空調與照明耗能以及自然採光的影響。研究分為軟體驗證與採光與耗能評估兩部份。軟體驗證部分，目的為驗證本研究使用之模擬軟體EnergyPlus與Radiance具有模擬再現性及適用範圍，於實驗屋分別進行室內溫度及照度實測，並與模擬數值比對。第二階段以辦公大樓為例，評估3種窗牆比、3種玻璃類型及3種不同開口率之金屬擴張網，分別裝設於東、西向建築開口部時，其對於採光與建築耗能的綜合評估。軟體驗證結果顯示，EnergyPlus模擬的誤差來自金屬擴張網的三維構造無法完全由模擬再現（R2=0.76），不過整體而言EnergyPlus的熱環境模擬仍具一定再現性（R2= 0.89）。DIVA光環境驗證結果顯示，針對實際照度低於1000 lx的環境下，實測值與模擬值呈顯著正相關（R2=0.87）。因此確認DIVA在此範圍的模擬具有再現性與準確度。
建築耗能與採光評估部分，結果顯示當窗牆比和玻璃日射取得率較高時，金屬擴張網具有較佳的節能比率。此外，窗牆比為50％或80％時，金屬擴張網顯著改善外周區過大照度有效減少眩光產生。然而，在窗牆比30%時，室內採光已嚴重不足因此不建議再安裝金屬擴張網與低可見光透過率之玻璃。在本研究36組模擬中，最佳方案解為窗牆比50％、採用膠合清玻璃與21%開口率的金屬擴張網。

Expanded metal mesh has become widely used as a shading element in the façade of many buildings in recent years, and its energy saving performance has been evaluated in the building codes of such tropical/subtropical countries as Singapore and Taiwan. However, expanded metal mesh reduces solar radiation while also reducing the natural daylight entering the building. This study’s objective is to assess the impact of expanded metal mesh on building energy consumption and natural daylighting.
This study is divided into two phases. The first phase verifies the accuracy and scope of application of EnergyPlus and DIVA software by field measurement. Results show that the thermal environment simulation of EnergyPlus is quite accurate, but some errors are caused by the three-dimension structure of the expanded metal mesh. And about DIVA, it has an accurate illuminance prediction ability when the actual illuminance is below 1000 lx.
The second phase takes the office building as an example, and evaluates the effects of different window to wall ratios(WWR), expanded metal mesh with different perforation rate, and different glazing type on building energy consumption and natural daylighting. Results show that the expanded metal mesh has a better energy saving ratio when the WWR and the glazing SHGC value are higher. On the other hand, when the WWR is 50% or 80%, the expanded metal mesh effectively improves the lighting environment. In 36 scenarios, when the WWR is 50%, the laminated clear glass and expanded metal mesh with 21% perforation rate is separately used, it conforms with the LEED daylight standard and has the lowest energy consumption.

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