Energy performance needs to be considered alongside architectural and engineering requirements rather than treated as a separate exercise. Exploring BIM energy analysis provides insight into how model information can support assessments of heating, cooling, lighting, and other energy-related factors. Different design scenarios can be evaluated to understand their potential effects. The quality of the analysis depends on the accuracy and completeness of the information used. Model data therefore needs appropriate validation.
http://www.uniccm.com/bim-and-building-energy-analysis