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Thermal analysis of IFC building models using voxelized geometries

Thermal analysis of IFC building models using voxelized geometries

Multi-disciplinary three-dimensional representations of building designs are available in BIM. However, thermal analysis often remains a manual task due to disparities in modelling: In IFC, buildings are decomposed into sets of elements with individual solid volumes. Thermal analysis requires interfaces between pairs of adjacent spaces.
In this work, we present an end-to-end solution for thermal analysis on IFC building models. We derive thin-walled thermal interfaces from architectural building models using voxelization. Neighboring spaces (separated by wall volumes in IFC) are touching after aligning to the voxel grid. The resulting mesh is converted into OSM files for OpenStudio/EnergyPlus.
This paper provides an implementation, discussion and initial validation. The algorithm depends on a minimal amount of information and favors robustness over accuracy, algorithms on voxels are robust. It is suitable for early design feedback and partial or imperfect scan2bim models.

Thomas Krijnen

October 04, 2021

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  1. Thermal analysis of IFC building models using voxelized geometries Thomas

    Krijnen and Tamer El-Diraby - Theohar Konomi - Ahmed Attalla
  2. Presenter • Thomas Krijnen • Post-doctoral researcher @ TU Delft,

    NL • Founder AECgeeks • Maintainer IfcOpenShell.org • ✉ [email protected] • 🐤 @aothms • 🖵 speakerdeck.com/aothms
  3. “ Unix philosophy Write programs that do one thing and

    do it well. Write programs to work together. Write programs to handle text streams, because that is a universal interface. ” Douglas McIlroy, Peter H. Salus
  4. Statistics Voxel space volume 58071.25 (464570 × 0.53) IfcSpace volume

    sum 47257.91 One-sided thermal interface sum 36640.25 IfcWall area sum (length x height) 16683.05 IfcSlab area sum (volume / thickness) 20315.27 IfcWall + IfcSlab area sum 36998.32 Number of IfcSpaces 218 Number of unique boundary sides 208
  5. Future work: automated detection of spaces (a) voxelized IFC geometries

    (b) exterior (c) interior as negation of b (d) spaces obtained as c - a a) b) c) d)
  6. Side step: other voxel use cases x y Door direction

    check Distance from exterior door Headroom check Safety barriers check
  7. Conclusion IFC as a driver for innovation in modular tools

    A robust, but less accurate, approach for thermal analysis on building models is presented Voxelization as a “low tech” solution to computational geometry problems in our industry