Green building information modelling technology adoption for existing buildings in Sri Lanka. Facilities management perspective.

The aim of this research is to develop a framework for the implementation of Green BIM technology for existing buildings in Sri Lankan context. A multiple case study was conducted under a qualitative research approach. Two existing buildings were selected for the cases. Autodesk Revit was used to design the BIM models of the cases. As Green BIM techniques solar analysis and energy analysis were conducted using Green Building Studio simulation software. Solar simulation results included cumulative insolation as 463,825 and 480,538 kwh, PV energy production as 231,659 and 111,024 kwh/year, energy savings as $34,749 and $16,654 and pay pack periods as 18.5 and 15 years for case 01 and 02, respectively. Further, research revealed the challenges during the application of Green BIM for existing buildings when building data are not adequately available. Moreover, this study proposed the solutions that are taken during the study to overcome the challenges. This study justifies the potential of Green BIM implementation for existing buildings through an in-depth analysis of challenges and possible solutions with a framework that can be used. This encourages building owners and facility managers towards using Green BIM for existing buildings. [ABSTRACT FROM AUTHOR]