A Study on Thermal Control Effects for Room by Rooftop Planting on RC Building

Rooftop planting has thermal control effects on indoor environment. The effects, however, very greatly according to the building structure, residents' daily activities, and local meteorological conditions as well as with the planting structure. The present paper uses two approaches to discuss the thermal control effects of rooftop planting on the indoor environment of reinforced-concrete (RC) building. First, we selected occupied RC building for a survey. From summer to winter, we measured the cross -sectional temperature and heat flow distribution from the roof to the occupied room. By reviewing the results of this survey, we clarified the thermal control effects of rooftop planting under conditions disctated by residents' daily activities, planting structure, and building structure. Then we simulated numerically different room temperature conditions and sectional structures of roofs, including the soil layer thickness, water content, heat insulating material, and rooftop planting. Through this simulation, we calculated the long-term and daily changes of the room-side surface temperature of the ceiling. Using the simulation data as indices, we discuss the control effects of rooftop planting on the indor thermal environment.