Research on a Green Roof Integrated Photovoltaic System for Bi-objective Optimization of Investment Value and CO2 Emission

In this paper, we proposed a simulation methodology for evaluating the performance of CO(2) Emission (CE) and Investment Value (IV) of Green Roof shape Integrated Photovoltaic System (GRIP V) of a Wooden Detached House using GA. CE and IV acting as evaluation indices were studied. It is an analytical comparative study of searching for efficient GRIPV by maximizing IV and minimizing CE simultaneously. Three typical locations in Japan are taken into account: Sapporo, Tokyo and Naha. We achieved optimal Pareto curve of each location. It illustrated that: GRIP Vs with larger southern roof area and fully covered with PVS perform the best in IV than others, and pitches of GRIP Vs in the given locations should be less than their ideal solar absorption cases. To minimize CE, GRIP Vs with larger roof pitches for enlarging PVS installment area to generate more electric power and larger greening area to absorb more CO(2) are needed.