Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6731841 | Energy and Buildings | 2015 | 7 Pages |
Abstract
In this study, an energy balance was applied to a horizontal net under outdoor conditions to predict Qnâa and hnâa. Therefore, the net was tacked onto a wooden frame; energy balance was applied below and above the net surfaces and above a black substrate underneath the frame. The wind speed (V), net-air temperature difference (ÎT), downward and upward solar and thermal radiation fluxes were measured, on sunny days, below and above the net to be used for solving the energy balance equations. Accordingly, the time dependence of Qnâa and hnâa were investigated. Nets with different porosities and colors were used. For each net tested, hnâa was expressed as a function of V and ÎT. The results showed that hnâa depends mainly on the texture structure of the net rather than its color or porosity. Therefore, a similar net texture would have nearly the same hnâa value. These expressions can be used to estimate hnâa for nets having similar texture structures, different colors, and different porosities.
Related Topics
Physical Sciences and Engineering
Energy
Renewable Energy, Sustainability and the Environment
Authors
A.M. Abdel-Ghany, I.M. Al-Helal, M.R. Shady, A.A. Ibrahim,