Predicting air flow and thermal comfort in an indoor environment under different air diffusion models

Correct air diffusion and the proper quantity of conditioned air are essential for comfortable conditions in forced-ventilation systems. Three different kinds of air diffusion models are studied for summer cooling conditions. These air diffusion types include a one inlet-one outlet, a two inlet-one outlet, and a one inlet-two outlet diffuser in an indoor environment. Evaluation of thermal comfort is made in terms of the percentage dissatisfied (PD) and air diffusion performance index (ADPI). A complete computed field is presented and discussed using an air flow velocity vector, temperature profile, and contours of PD as well as ADPI.