Green roof gardens, as an emerging urban greening method, have potential benefits in alleviating urban heat island effect and reducing building energy consumption. To evaluate the actual benefits of green roof garden design in reducing building energy consumption, carbon emissions, and extending the service life of building surface materials, a carbon balance-based carbon balance accounting model for roof gardens is constructed. The analytic hierarchy process-entropy weight method is used to weight analyze the evaluation index system of green roof gardens, and the performance differences between green roofs and common building roofs are compared and studied. The research results find that the annual energy consumption of green roofs is 180 kWh/m2, which is significantly lower than the 490 kWh/m2 of common building roofs. The carbon emissions are 3 tons, which is lower than 5 tons for common building roofs. After 30 months, the aging degree of green roof materials is 39%, much lower than the 78% of common building roofs. Green roof garden design has significant advantages in energy conservation and emission reduction, as well as extending the service life of materials, and contributes significantly to advancing sustainable urban growth. The research provides scientific basis for urban planners and architects in green building project decision-making, promoting innovation and application of green building technology.
Guo et al. (Mon,) studied this question.