Performance analysis during the early design stage can significantly reduce building energy consumption. However, it is difficult to transform computer-aided design (CAD) models into building energy models (BEM) to optimize building performance. The model structures for CAD and BEM are divergent. In this study, geometry transformation methods was implemented in BES tools for the early design stage, including auto space generation (ASG) method based on closed contour recognition (CCR) and space boundary topology calculation method. The program is developed based on modeling tools SketchUp to support the CAD format (like *.stl, *.dwg, *.ifc, etc.). It transforms face-based geometric information into a zone-based tree structure model that meets the geometric requirements of a single-zone BES combined with the other thermal parameter inputs of the elements. In addition, this study provided a space topology calculation method based on a single-zone BEM output. The program was developed based on the SketchUp modeling tool to support additional CAD formats (such as *.stl, *.dwg, *.ifc), which can then be imported and transformed into *.obj. Compared to current methods mostly focused on BIM-BEM transformation, this method can ensure more modeling flexibility. The method was integrated into a performance analysis tool termed MOOSAS and compared with the current version of the transformation program. They were tested on a dataset comprising 36 conceptual models without partitions and six real cases with detailed partitions. It ensures a transformation rate of two times in any bad model condition and costs only 1/5 of the time required to calculate each room compared to the previous version.

早期设计阶段的性能分析可以显着降低建筑能耗。然而，将计算机辅助设计（CAD）模型转化为建筑能量模型（BEM）以优化建筑性能是很困难的。CAD 和 BEM 的模型结构不同。本研究在早期设计阶段在BES工具中实现了几何变换方法，包括基于闭合轮廓识别（CCR）的自动空间生成（ASG）方法和空间边界拓扑计算方法。该程序基于建模工具SketchUp开发，支持CAD格式（如*.stl、*.dwg、*.ifc等）。它将基于面的几何信息转换为基于区域的树结构模型，结合单元的其他热参数输入，满足单区域 BES 的几何要求。此外，本研究还提供了一种基于单区边界元输出的空间拓扑计算方法。该程序基于SketchUp建模工具开发，支持其他CAD格式（如*.stl、*.dwg、*.ifc），然后可以导入并转换为*.obj。与目前主要侧重于 BIM-BEM 转换的方法相比，该方法可以确保更高的建模灵活性。该方法被集成到名为 MOOSAS 的性能分析工具中，并与当前版本的转换程序进行比较。他们在一个数据集上进行了测试，该数据集包含 36 个没有分区的概念模型和 6 个有详细分区的真实案例。它确保在任何恶劣的模型条件下都有两倍的转换率，并且与之前的版本相比，计算每个房间所需的时间仅为 1/5。