Effect of inlet direction of warm air from linear openings on thermal comfort and energy consumption in an auditorium

In the present study, the effect of direction of inlet warm air from linear openings has been numerically analyzed on thermal comfort and energy consumption in an auditorium with a displacement ventilation system. For this reason, the linear openings are placed on the walls around the hall and four different inlet air angles are considered. Based on the results, for obtaining same thermal comfort conditions, the inlet air temperature must be 20.4, 20.6, 20.8 and 21.1C, respectively for inlet angles of 0, 30, 45 and 60 degree. Also, results show that increasing the inlet angle toward the horizon can lead to decrease the mean air velocity and mean temperature in occupied zone. Moreover, horizontal air discharge to the auditorium causes more uniformity in thermal comfort conditions and more amount of energy consumption. Also, results indicate that, respectively for 30, 45 and 60 air discharge angle, the energy consumptions are 2.5%, 4.4% and 7.2% lower in relative to horizontal air discharge.