fASHRAE 90.1-2007, as an alternative to the prescriptive requirements. Figure t shows an example of a 3-D building model. Figure 1. Screenshot from Building Simulation Software Ow DSO tar • •11 >SS w 410 eta co tam •sx 1.6.2 riefionoK nel•alt 01401•••••• 4..m.imant ••••• 0.1•••••MO ains.a. %nag 0....••••