This information includes the geometry of the project (shapes, layout), the physical properties of the materials (wall constructions, thermal properties, visual properties), the type of the spaces in the building, and schedules of operations of each part of the building. Other inputs that can be part of the model include the location of the building and weather files, which contain detailed information on such environmental characteristics as temperature, the sun’s path and wind patterns.
Using this information, analysis engines can run simulations on things like HVAC sizing, energy use, water use, shading, and lighting levels. You can then make better design decisions by analyzing and documenting the expected performance of your design.
The infographic below explains how BIM and BPA are related, and what types of analyses can be considered building performance analysis. Whole Building Energy Analysis takes into account the interdependencies of the building as a whole system, so it is a particularly useful way to "keep score" as you work to reduce building energy use. Other performance studies like daylighting and solar radiation can help you improve aspects of the design. These studies are most effective when done in conjunction with energy analysis.
- See more at: http://sustainabilityworkshop.autodesk.com/buildings/building-performance-analysis-bpa#sthash.MA156hAB.dpuf