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 (2Ae2B), installation costs (not only for
the supporting system but also for the irrigation system) and
maintenance costs for vegetation and irrigation system are high.