Numerical analysis of passive cooling using a porous sandy roof

被引：15

作者：

dos Santos, Gerson H. ^{[1
]}

Mendes, Nathan ^{[2
]}

机构：

[1] Univ Fed Parana UFPR, Dept Mech Engn, Setor Tecnol, BR-81531990 Curitiba, Parana, Brazil

[2] Univ Catolica Parana PUCPR, Dept Mech Engn, BR-80215901 Curitiba, Parana, Brazil

来源：

APPLIED THERMAL ENGINEERING | 2013年 / 51卷 / 1-2期

关键词：

Passive cooling; Porous media; Building simulation; PERFORMANCE; HEAT;

D O I：

10.1016/j.applthermaleng.2012.08.046

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A mathematical model to simulate an unsaturated sandy roof is considered in order to predict its effects on building passive cooling. The present methodology is based on the theory of Philip and De Vries, using the hygrothermal properties for different types of building envelope porous materials. The governing equations have been discretized using the finite-volume method for modeling the physical phenomena of heat and mass transfer in unsaturated porous media and they have been solved by using the MultiTriDiagonal-Matrix Algorithm (MTDMA), avoiding numerical instability related problems due to the strong coupling between the mass and energy conservation equations. In order to predict the room air temperature and relative humidity, a lumped transient approach for a building room has been considered. Comparisons of the sand layer effect on the heat flux through a horizontal roof and on the indoor psychrometrics conditions are discussed. (c) 2012 Elsevier Ltd. All rights reserved.

引用

页码：25 / 31

页数：7

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