Study on the Effect of Displacement Ventilation System in Hospital Negative Pressure Isolation Wards on the Risk of Airborne Infection
Effective ventilation in hospital negative-pressure isolation wards is crucial for reducing nosocomial cross-infections and minimizing energy consumption.In our paper,we studied the applicability of displacement ventilation in negative-pressure isolation wards.In order to assess the ventilation system under different conditions,we applied the concepts of air change efficiency and indoor contaminant removal effectiveness.The study primarily utilized simulations to examine indoor air exchange efficiency and indoor contaminant removal effectiveness under various conditions and validated these simulation results through experiments.Within our study,we assessed the impact of the air change rates,the location of radiant walls,and outlet positions on the air change efficiency and contaminant removal effectiveness.The results indicate that the actual ventilation efficiency of displacement ventilation ranges between 0.5 and 1.0,while contaminant removal effectiveness primarily falls between 0.73 and 2.0.Additionally,the contaminant'lock-up'phenomenon was observed at the breathing heights of healthcare workers.Although displacement ventilation systems can reduce indoor energy consumption,they simultaneously increase the exposure risk for healthcare workers.
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