Effect of ventilation pattern on room air and contaminant distribution

The ventilation efficiency of different ventilation patterns arranged by tw o inlet and two outlet diffusers at different locations is investigated. Th e numerical simulation was first adopted to predict airflow pattern and ven tilation performance. Then, a laboratory experiment at room air and contami nant distribution in a full-scale test chamber was conducted to validate th e simulation results. Applied the tracer-gas techniques to the experimental program, a concentration decay of CO2 is used to calculate the ventilation efficiency and air change rate of the test chamber. The distribution of su pply/exhaust air in the study characterized by ventilation efficiency, was investigated in isothermal conditions using different supply air velocities . The results indicate that the ventilation efficiency might be dominantly influenced by location of diffuser rather than air change rate. (C) 2001 El sevier Science Ltd. All rights reserved.