Thermal Characteristics Comparison for Several Roofs of Naturally Ventilated Rooms

Abstract:

Four kinds of insulation roofs of naturally ventilated rooms in Chengdu(P.R.C) were tested to evaluate the thermal performance in summer. The thermal characteristics of roofs with different construction were compared by regression analysis. The experimental results showed a strong negative correlation between the highest outdoor air temperature and the largest temperature increment. As the highest outdoor air over 29.1°C, the light green ventilated roof has the best insulation performance. Under "sunny - rain" climatic conditions in summer, the heat flux through the extruded polystyrene insulation roof was always toward outside, which is not good for cooling the structural roof at night. The heat flux of inner surface of concrete slab ventilated roof was the most sensitive with mean solar radiation, and it has the worst performance for attenuating fluctuations of solar air temperature of outdoors.

• Periodical: Applied Mechanics and Materials (Volumes 170-173)
• Pages: 2681-2685
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.170-173.2681
• Online since: May 2012
• Authors: Shu Kui Zheng*, Jie Zhang
• Keywords: Green Roof, Roof Construction, Thermal Characteristic, Ventilated Roof

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