玻璃鍍膜面位置對玻璃熱學性能之影響

The Influence of the Coating Film Position on Thermal Performance of Glazing

玻璃建材影響建築物耗能所佔的比例相當大，因此世界各國均在推行節能玻璃標章，以鼓勵使用節能效益較高的玻璃建材。然而，新的節能玻璃材料大多被應用在新建的建築物上。考量成本效益，既有玻璃帷幕建築的節能改善策略是在玻璃內側塗裝隔熱膜。根據相關文獻證實，隔熱膜的貼附會使得室內側的玻璃表面溫度過高，造成靠近玻璃周圍的熱舒適度降低。因此本文首先利用小型熱箱法探討鍍膜面朝室內外側對玻璃表面溫度的差異；並且利用鉛筆硬度、耐磨耗性、耐酸鹼性以及碳弧燈加速老化曝曬等實驗，研究鍍膜面放置在室外側的耐候性能，本文最終目的是評估將玻璃的鍍膜面朝室外側之可行性。由實驗結果顯示，鍍膜面放置在室外側會使得室內側表面溫度比鍍膜面放置在室內側的表面溫度降低約10 ℃。但是直接將隔熱膜貼附在玻璃室外側無法通過耐候性測試。本研究最後發展出在鍍膜面外層再塗附一層TiO2 光觸媒薄膜，因TiO2 光觸媒薄膜受光照硬化以及親水自潔淨的特性，使得產品不僅具有節能玻璃的特點，更具備超越CNS 標準之耐候特性。

As well known, solar heat gain via fenestration contributes to a significant proportion of the building envelope cooling load. Therefore, many countries have the window energy rating label system to prompt the consumers using the approved energy-saving window material, currently. However, it is not feasible to retrofit all window glazings in the existed building based on cost consideration. To reduce the energy expenditures in the existed building, adhere the solar control film on the window glass were more often used. Literature survey in this work revealed that the higher interior surface temperature on glass due to the film absorption of solar radiation, resulted in the decrease on thermal comfort index. This research project was initiated to evaluate the thermal performance and durability of glass with film faced on outside environment. The experimental results indicated that the surface temperature on glass with film faced the exterior was lower 10 0 C than that on glass with film faced the interior. On the other hand, the glass with solar coating film faced the exterior can not pass the durability test and accelerated aging test. In order to meet the specifications of durability tests, and have the excellent thermal performance, the proposed glass doping TiO2 photocatalyst layer outside solar film was developed in this study.