BIM to BEM translation workflows and their challenges: a case study using a detailed BIM model

This paper addresses the expedited translation process of a building information model (BIM) into a building energy model (BEM). Accurate systematic or automated translation of building geometry is the primary concern because it provides a faster and potentially more accurate alternative to recreating BEM geometry from floor plans. This BIM to BEM translation has been partially addressed by various efforts; however, obtaining a meaningful energy model geometry and extracting associated information from a detailed BIM still requires expertise and remains an elusive goal. This paper highlights currently available tools and workflows, identifies associated challenges and limitations, and suggests modelling techniques and potential software features for a better BIM to BEM integration. A net-zero energy commercial building was used in the case study, in conjunction with three energy simulation programs: OpenStudio, Virtual Environment, and Insight 360. This paper intends to provide industry professionals and researchers with modern BIM to BEM workflows.