Lowering Emissivity of Concrete Roof Tile’s Underside Cuts Down Heat Entry to the Building

Autor: Xuejun Chen, Lei Wang, Zhikui Liu, Yinghong Qin, Ting Bao
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Advances in Materials Science and Engineering, Vol 2019 (2019)
Druh dokumentu: article
ISSN: 1687-8434
1687-8442
DOI: 10.1155/2019/5438321
Popis: Buildings in Southern China widely use a double-skin roof to reduce heat entry through the roof to the building interior during summertime. Concrete roof tiles are preferably installed as the outmost layer of the double-skin roof due to their resistance to hail and wind damages and their attractive price. However, after construction, the tile’s top tends to be darkened by dust deposit and algae growth, increasing the heat entry through the roof to the building. Here, we show that this heat entry can be curtailed by lowering the emissivity at the tile’s underside. Temperatures and heat fluxes at different elevations of a double-skin roof with concrete tiles as the outmost layer of the roof are monitored. The underside of each concrete tile is coated with a specific paint to get a unique emissivity. Observations reveal that lowering the emissivity of concrete roof tiles could cut down the summer heat gain of buildings in tropical regions.
Databáze: Directory of Open Access Journals
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