Effect of ventilation mode and rate on airborne transmission of respiratory disease in indoor environments

Abstract Ventilation might play an important role in airborne transmission. By using the computational fluid dynamics (CFD) method, ventilation modes, rates, and infection source’s face direction were considered a multi-person indoor environment (10 m*10 m*3 m). The airflow patterns, virus concentration distribution, probability studied. results showed that was lower with displacement (DV, in, upper out) than mixing (MV, top-centre or natural (NV, out). In 2 air changes per hour (ACH), risk of susceptible persons MV NV be about 2.43-fold 1.30-fold more DV. Increased usually reduces viral concentrations infection. For height breathing zones, average at 12ACH 49.78%-78.72% 2ACH. distance 2.8-4.2 m to COVID-19 infector 30 min exposure time, long-range 11.53% (±5.86) (2ACH), 4.96% (±1.82%) (6ACH), 2.96% (±1.91%) (12ACH).