隨著全球暖化日漸加劇，國際能源總署(IEA)於2021年發布「2050年淨零路徑」，以控制溫室氣體排放。我國國家發展委員會亦提出「臺灣2050淨零排放路徑」，期望以2030年、2050年為基準，在各產業達到近零碳排放。其中建築部門提出BERS(建築能效評估系統)以控制建築日常使用耗能及碳排放、LEBR(低蘊含碳建築評估系統)以輔助建築業者於設計階段評估蘊含碳排。而隨著BIM(建築資訊模型)之興起，BIM-LCA之開發不僅能更有效率地協助建築師做低碳認證，更能推動產業轉型以加速淨零碳路徑之發展。
隨著BIM-LCA的發展，既有研究指出，BOQ(工程量清單)與可視化編程之應用可分別效率地評估構件材料與建築量體之碳排，從而達到精準、快速的設計階段評估。然而現有減碳評估工具的應用範圍多以使用碳排為主，近年來開始陸續出現了涵蓋蘊含碳排的全生命週期評估，但許多能效評估系統仰賴設備與材料熱性能的BIM資訊，需配合較高LOD等級(BIM細節度，由LOD100~500表示)之BIM模型計算，這仰賴基本設計階段以後之資訊，耽誤了蘊含碳排減碳潛力之黃金時期。
本研究目的旨在開發一套可於設計初期操作的減碳評估工具，並能因應LOD以設計導向進行蘊含碳與耗能的整合計算，達到實務設計中輔助減碳設計決策的效果。本研究開發之BIM-CATT(Bim-based Carbon Analysis Tool in Taiwan)參考LEBR評估蘊含碳，運用API連接碳排資料庫、專案參數賦予材料碳排資訊，最後用Dynamo(可視化編程)得出評估與分級。若模型處於設計初期的量體階段，系統會參照容積、建築用途，以設計導向自動得出工程的預測數量，並套用基準碳排參數，以得到現階段減碳評估之回饋；能效計算則是參考BERS，在BIM中以平面空間劃分耗能分區計算，並能透過材料資產的熱性能參數設定，自動化評估外殼節能效率，達到設計階段的耗能評估。最後搭配LEBR得出全生命週期評估結果，並以可視化圖表方式呈現。
本研究透過BIM-CATT評估實際案例模型，分別以LOD300基本設計階段驗證實際施工狀況之建模、以LOD100概念設計階段操作設計初期的碳排預測計算、以LOD500細部設計階段演示BERS配合LEBR設計階段的計算方式。結果顯示了BIM計算的準確度、以及設計初期運用BIM-CATT輔助減碳決策推進的效果、耗能評估配合蘊含碳評估於BIM設計階段計算的設置方式。

As global warming escalates, the IEA introduced the "Net Zero by 2050 Pathway" in 2021 to curb greenhouse gas emissions. Taiwan's National Development Council proposed the "Taiwan 2050 Net Zero Emission Pathway" to achieve near-zero carbon emissions across industries by 2030 and 2050. In the building sector, BERS and LEBR have been announced to control OC(operation carbon) and EC(embodied carbon). With the rising of BIM(Building Information Model), current studies show that BIM-LCA can facilitate efficient low-carbon certification in several design processes. However, existing tools primarily focus on OC analysis in detailed design, delaying EC reducing potential.
This study aims to develop BIM-CATT(Bim-based Carbon Analysis Tool in Taiwan), integrating EC and OC in early design stages and carring out LCA in different LODs. BIM-CATT references LEBR for EC, utilizes API for carbon fators database and Dynamo for assessments, while the OE(operation energy) thus OC is based on BERS. With the user interface for EUI and envelope thermal parameters, BIM-CATT automatically resulting LCA reports in early design process.
The features of BIM-CATT are conducted by the following case studies: The verification of calculation accuracy based on real construction works is shown in a LOD300 model, which is in the schematic design phase; The assessment of the LOD100 model, which is in conceptual design phase, shows the possibility of reducing EC in early stages; The LCA of the LOD500 model, which is in detail design phase, demonstrates different workflows in design process, which contain both LEBR and BERS. The above results show BIM-CATT's accuracy and effectiveness by ongoing cases, which is a crucial part for architecture industries in this Net-Zero future.

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