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ISSN Online: 2688-7231

ISBN Online: 978-1-56700-524-0

Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
December, 17-20, 2021, IIT Madras, Chennai, India

EFFECT OF MOISTURE ON CONVECTION HEAT TRANSFER THROUGH ROOFTOP SOLAR CHIMNEY

Get access (open in a dialog) DOI: 10.1615/IHMTC-2021.1650
pages 1087-1092

摘要

This study aims to develop a mathematical model of a solar chimney to study the effect of moist air on the performance of solar chimney by considering the density change of humid air with its moisture content. Steady-state heat transfer equations were developed for glass, the air between glass and absorber wall and for absorber wall. The matrix method used the Gauss-Seidel iteration approach to solve these steady-state equations in the in-house developed MATLAB code. Comparisons were made for different correlations of the Nusselt number, and it was observed that the turbulent flow model better predicted the results. Additionally, the impact of relative humidity on a solar chimney's performance was investigated. The method of heat absorption by air, convection, was examined, and the system's performance was quantified in terms of the mass flow rate of air. The relationship between the mass flow rate of air and the distance between the glass and the absorber plate is also investigated as a function of relative humidity. The result shows a 1.6% to 4.5% decrease in air mass flow rate through the solar chimney for 50% relative humidity compared to dry air, depending on solar insolation between 500 W/m2 to 750 W/m2.