Numerical study of vertical solar chimneys with moist air in a hot and humid climate

The purpose of this study was to investigate numerically the effect of moist air on the performance of a vertical solar chimney. Numerical models were constructed to simulate the heat transfer and fluid flow of dry air and moist air with a relative humidity of 30-80% in a solar chimney. Computational results of air velocity and temperature distribution in the solar chimney with dry air were compared to results with moist air, under a constant chimney wall temperature. Compared to a solar chimney with dry air, the yield of ventilated air flow was 15.4-26.2% less and the overall air temperature was higher for a solar chimney with moist air. To maximize ventilation and reduce backward flow at the opening, an aspect ratio of 14:1 and a limited opening height are recommended for solar chimneys with moist air.