隨著氣候變遷，永續綠建築節能設計已經興起，對於現在溫室效應的氣候，空調用電量佔每個家庭的41%，要如何在節能減碳之中，又可以讓各個家庭中的人員生活的舒適是個必要的課題，將可籍由改良建築外殼構造的隔熱性能，使室內居住環境得到改善，已達到節能減碳的效益。
本研究利用簡易的熱傳原理及手法，自行分析出一套穩態分析法，其方法可以於現地評估外牆建材的隔熱性能優劣，首先藉由將已知熱傳導係數之均質板材確立其方法的配置及可行性和正確性，並且進行將此方法導入鋼筋混凝土構造之外牆常利用的三種型式，分別為：水泥砂漿外壁、外貼面磚外壁、油漆粉刷外壁，利用此方法去探討水泥砂漿外壁及外貼面磚外壁兩種型式是否確實符合我國現在節能法規，進而去分析使用隔熱漆的外壁是否有效的降低輻射熱能進入室內的可能。
研究結果顯示，利用此研究推導出的評估方法可以確實量測出其外牆建材之熱傳導係數。另外，沒有使用隔熱漆之實驗牆體的所測得熱流高達739.8 W/m2比起有使用隔熱漆的實驗體的熱流僅354.2W/m2，證實隔熱漆有助於降低輻射熱能傳導穿透壁內的熱能。

While global warming is becoming a more concerned topic, continuous green and energy saving design architecture is getting more popular. With greenhouse effect, on average, the electricity spent on air-conditioning accounts for 41% of the total electricity usage in each family. To balance between saving energy and providing a comfortable living environment to family members, we could focus on improving the ability of thermal insulation of a building facades.
We made use of thermal conductivity theory with simple and easy method to conduct this research. From this research, we deduced a steady state analysis which could help assess the thermal insulation ability of the external wall of a building on the spot. First of all, we need to make sure we could get the correct thermal conductivity on different same-size acrylic boards. We then try to measure the thermal conductivity of building’s external walls which were constructed in three different most popular methods: cement mixed with sands pasted on the surface, bricks pasted on the surface and varnish painted on the surface. We could then analyse these 3 different kinds of external walls are meeting the current energy conservation regulations.
As the result, we found this is a good way to accurately measure the thermal conductivity of external walls. Compared to other insulation measurement methods, this method does not have location and size constrain but is able to see if the thermal insulation ability of the specific external wall is good or not

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