Springtime Monitoring of Passive Cool Roofs in Subtropical Climate
Springtime Monitoring of Passive Cool Roofs in Subtropical Climate作者机构：LACAF (Laboratory of Environmental Comfort and Applied Pl~sics) University of Campinas S6o Paulo 49170-000 Brazil DAC (Department of Architecture and Construction) University of Campinas Sao Paulo 13083-852 Brazil
出 版 物：《Journal of Civil Engineering and Architecture》 (土木工程与建筑（英文版）)
年 卷 期：2014年第8卷第11期
页 面：1364-1370页
学科分类：07[理学] 08[工学] 070601[理学-气象学] 081304[工学-建筑技术科学] 0706[理学-大气科学] 0813[工学-建筑学]
主 题：亚热带气候 气候监测 蒸发冷却系统 内表面温度 屋顶 冷却技术 纤维水泥 传热系数
摘 要：Passive strategies for acclimatization of buildings have been studied by several authors in many countries, especially the evaporative and radiant cooling techniques. Fiber cement tiles are very common in popular constructions due to their low cost. However, they have over twice of the value thermal transmittance indicated to this bioclimatic zone according to Brazilian guidelines. The objective is to present an alternative to reduce high temperatures on fiber cement tiles. In this paper, the monitoring of passive cooling of roofing during the spring season in a city with subtropical climate is described. Single and combined reflective and evaporative cooling systems were studied in different environmental conditions. Internal surface temperatures of tiles were monitored together with weather variables. Results show a decrease of about 6 oC, 9 oC, 10 oC and 11 oC as compared to the original tiles according to environment conditions and the combined passive cooling techniques. These results allow for the conclusion that the use of passive cooling techniques opens up new possibilities to attenuate the internal surface temperatures of tiles and to consequently decrease the roofing solar heat gain into buildings, thus, providing less air cooling energy consumption.
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