Effect of Green Roofs Combined with Ventilation on Indoor Cooling and Energy Consumption

With the increase in building energy consumption and the improvement of the thermal environment requirements of the residents, it is very important to find a way to adjust the thermal environment for the residents and to save energy. In this paper, an experimental building in Shanghai, China, was chosen, and used DesignBuilder software to simulate the cooling and energy-saving potential of green roof combined with intermittent ventilation in hot summer and cold winter zone. The results show that the use of intermittent ventilation is more conducive to indoor cooling than the all-day ventilation, and the green roof combined with intermittent ventilation is better. During the entire air-conditioning season, the proportion of the time which under the upper limit of acceptable temperature reduced by 20% compared the insulation roof with all-day ventilation. In the case of intermittent ventilation, the energy consumption of the two roofs is reduced by about 10% compared with that without ventilation, while the energy-saving rate of green roof with ventilation is 26.7%.