Locations of diffusers on air flow field in an office

Typical ventilation in an air conditioning office was simulated numerically by the Computational Fluid Dynamics (CFD) software-Fire Dynamics Simulation (FDS). FDS was developed by the National Institute of Standards and Technology (NIST), and the Large Eddy Simulation (LES) model and the predictor-corrector time integration methods were used. The results of the simulation and the experiment were compared. It was found that most of the results agreed well. When both of the supply air rate and the exhaust air rate were constant, the effects of different locations of diffusers were analyzed. When the diffuser was at the lower part of the office, the different locations effects on the temperature distribution of the office were not apparent. When diffuser was at the ceiling of the office, the air temperature and velocity of the center of the office changed obviously, the ratios of the temperature and velocity of the central air of the office to that in the diffuser could get two and three times respectively. When the diffuser was at the top of the compartment, the air flow field was disturbed which is propitious to the heat diffusion to the surroundings. The influence of the diffuser with height is more obvious than with locations at a certain height to the temperature.