Therefore, roof rainwater and other impervious surface runoff rainwater are collected and used. The total incremental cost of the green building of the project is 26.963 million yuan, which is equivalent to the incremental cost per unit construction area of 1872.4 yuan / square meter. Large-scale demonstrations of solar photovoltaic systems, adjustable external shadow systems and recyclable materials increase costs. After calculation and analysis, the annual operating cost can be reduced by about 883,100 yuan.
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