Computational Fluid Dynamics Analysis of an Office With Seated Persons and a Double-Duct Solar Roof Chimney for Passive Ventilation

Abstract This investigation reports a detailed computational study of heat transfer and airflow in an office with seated persons with a double-duct vertical roof solar chimney (SC). The computational model was validated with experimental temperature profiles. The validated computational model was used to analyze the effect of the heating of the SC and one vertical wall of the room on temperature fields, flow patterns, and the draught rate (DR) (discomfort index) in the thermal system. According to the Standard 62.1 of the American National Standards Institute (ANSI) and the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE), the present arrangement is adequate for the ventilation of offices. According to DR values, in offices with seated persons, the use of solar chimneys offers a natural and comfortable ventilation alternative, causing the removal and exchange of air, thereby improving the entry of air without compromising comfort conditions.