TY - GEN
T1 - Updating R-values of BIM elements using 3D thermography for accurate building energy performance simulation
AU - Ham, Youngjib
AU - Golparvar-Fard, Mani
N1 - Publisher Copyright:
© ASCE 2014.
PY - 2014
Y1 - 2014
N2 - Over the past few years, anecdotal evidence and controlled studies on predicting the actual energy performance of existing buildings have raised concerns about the accuracy of energy performance simulations using Building Information Models (BIM). Among numerous sources of modeling inaccuracy, the wrong thermal properties of solid assemblies can significantly impact the reliability of the BIM-based energy analysis. Without considering the diminishing thermal resistance (i.e., R-value) of building materials caused by their deterioration and updating such material properties in BIM, BIM-based energy simulation of existing buildings could be unreliable for retrofit decision-making purposes. This paper proposes an automated method for updating the R-value of building elements in BIM. By exploring 3D spatio-thermal models reconstructed from 2D thermal images, the actual R-values are calculated at the level of 3D points. The calculated actual R-values are used to automatically update the thermal properties of the corresponding gbXML-based BIM elements. For validation, several experiments on measuring and updating the R-value of BIM elements are conducted in an existing residential building. Using the proposed method, BIM-based energy analysis tool scan more accurately model the as-is conditions of existing buildings and estimate their actual energy performances.
AB - Over the past few years, anecdotal evidence and controlled studies on predicting the actual energy performance of existing buildings have raised concerns about the accuracy of energy performance simulations using Building Information Models (BIM). Among numerous sources of modeling inaccuracy, the wrong thermal properties of solid assemblies can significantly impact the reliability of the BIM-based energy analysis. Without considering the diminishing thermal resistance (i.e., R-value) of building materials caused by their deterioration and updating such material properties in BIM, BIM-based energy simulation of existing buildings could be unreliable for retrofit decision-making purposes. This paper proposes an automated method for updating the R-value of building elements in BIM. By exploring 3D spatio-thermal models reconstructed from 2D thermal images, the actual R-values are calculated at the level of 3D points. The calculated actual R-values are used to automatically update the thermal properties of the corresponding gbXML-based BIM elements. For validation, several experiments on measuring and updating the R-value of BIM elements are conducted in an existing residential building. Using the proposed method, BIM-based energy analysis tool scan more accurately model the as-is conditions of existing buildings and estimate their actual energy performances.
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U2 - 10.1061/9780784413616.015
DO - 10.1061/9780784413616.015
M3 - Conference contribution
AN - SCOPUS:84934326380
T3 - Computing in Civil and Building Engineering - Proceedings of the 2014 International Conference on Computing in Civil and Building Engineering
SP - 113
EP - 120
BT - Computing in Civil and Building Engineering - Proceedings of the 2014 International Conference on Computing in Civil and Building Engineering
A2 - Issa, R. Raymond
A2 - Flood, Ian
PB - American Society of Civil Engineers
T2 - 2014 International Conference on Computing in Civil and Building Engineering
Y2 - 23 June 2014 through 25 June 2014
ER -