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Research Article

A Multiscale Differential Evolution Algorithm-Based Maintenance Plan Optimization for Building Energy Retrofitting

Table 3

Performances of maintenance plans with different budget limits.

CasesBudget limit ($)Energy savings (kWh)Percentage saved over targetIRRPayback period (months)NPV ($)Maintenance cost ($)Total investment ($)

Fixed schedule20,0001,167,21511.99%72.15%18.7251427.7819,98640,678
Optimal schedule20,0001,190,46414.22%76.23%16.9252949.319,99840,690
Fixed schedule40,0001,670,77360.30%79.20%18.1268393.8639,98760,679
Optimal schedule40,0001,702,04163.31%79.27%17.6470076.1639,98660,678
Fixed schedule65,0001,829,74175.56%78.81%18.6470608.3452,38273,074
Optimal schedule65,0002,001,19192.01%80.44%17.2877670.8458,04678,738

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