scenario; the other two scenarios are under the limit of acceptability.
For the best scenario the NPV is positive with only 289 V,
with IRR of 4.5% and PBP of 16 years (Table 7; Graphs 1 and 2). As for
the indirect green façade (2A-2B), installation costs (not only for
the supporting system but also for the irrigation system) and
maintenance costs for vegetation and irrigation system are high.