Impact of smoke exhaust rate based on FDS on key fire parameters in a certain isolation ward hospital
This study focuses on a specific isolation ward hospital,and the evolution of key fire parameters in differ-ent smoke exhaust conditions is investigated using the FDS numerical model.A rectangular fire source of 1.2 m× 2 m was selected,with a total heat release rate set at 3 200 kW.The fire development type was rapid fire,and the smoke exhaust was set to three working conditions:natural ventilation,mechanical ventilation,and vehicle ventilation.In ter-ms of visibility,under natural ventilation condition,using visibility as a metric,the minimum safe evacuation time in the corridor is approximately 110 s.The smoke exhaust rate has relatively small impact on the critical time near the fire source,while at other measurement points,the critical time gradually increases with the smoke exhaust rate,with the most significant increase observed at measurement point that one smoke exhaust unit away from the fire source,reaching an increase of more than two times.Under high smoke exhaust rates,most areas on the second floor maintain visibility above 600 s for the critical time.Regarding CO concentration and temperature fields,the CO concentration in the corridor consistently remains below 0.14％,and the temperature does not reach 80 ℃,both staying within safe thresholds,with minimum safe evacuation times exceeding 600 s.In the room with the fire source,enhanced ventila-tion from fans leads to more thorough combustion of combustible materials,resulting in a maximum 10％increase in the accumulation rate of CO concentration and a peak temperature increase of 9.8％.This study provides data support for the fire design of future similar medical buildings,enhancing the fire design for similar mobile medical facilities.
万方数据
维普
