Abstract

This study presents a transient two-dimensional computational model of a combined natural convection, conduction, and radiation in a cavity with an aspect ratio of one containing air as a non participant fluid. The cavity has two opaque adiabatic horizontal walls, one opaque isothermal vertical wall The opposite vertical wall is a semitransparent wall that consists of a 6 mm glass sheet with a solar control coating of SnS-Cu*S facing the inside of the cavity permitting solar radiation exchanges between the cavity and its surroundings' The momentum and energy equations in transient state were solved by finite differences using the ADI technique. Coupled to this equations are the transient conduction equation and the radiative energy flux boundary conditions The results in this paper are limited to the range of 10*<Gr<10' with an isothermal vertical cold wall of 21°C, outside air temperatures (T.) of 35°C and incident solar radiation of AM2 (750 W/m') normal to the semitransparent wall A Nusselt number correlation as a function of the Rayleigh number is presented.

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