Fig. 3: Influence of different parameters and mitigation strategies on the global risk of infection RCFD of venues with different ventilation concepts.
The parameter study was performed for different parameters, mitigation strategies, activity levels and emitter positions for the venues with displacement (DVV), mixing (MVV) and natural (NVV) ventilation for the case of a single silent, sedentary emitter (reference). The global risk of infection RCFD represents the sum of the individual infection risks PCFD and was calculated for each emitter position of each setting. The RCFD value is a measure of the number of secondary infections. The reference settings (black) were as follows: no face masks, event duration of 2 h, SARS-CoV-2 wild-type variant, full airflow rate and full occupancy. The efficacy of masks was investigated using surgical masks (65% filtration efficiency (0.35)) and well-fitting FFP2/N95 masks (96% filtration efficiency (0.04)). RCFD values were highlighted according to their risk potential using a colour-coded scale with: high risk—RCFD ≥ 1 red, medium risk—RCFD = 0.5–1 shades of yellow-orange-red, low risk—RCFD = 0–0.49 shades of yellow-green. The analytical risk of infection Ranalyt values (grey) were calculated according to Peng et al. 29. Empty boxes indicate the absence of numerical measurements for a given configuration.
