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- W2183685253 abstract "Long-throw sprinklers were installed at height to protect tall atria which are unlikely to store high amounts of combustibles. Water coverage at the protected area was demonstrated to be adequate. However, there are concerns on long-throw sprinkler installation in tall atria likely to have high combustible contents. The large buoyancy of hot gases from the big fires with long burning duration would induce much stronger turbulent airflow. The long distance travelled by the water droplets in the sprinkler spray discharged in a tall atrium would experience much stronger air dragging effect. Air entrainment towards the fire plume and sprinkler water spray would be entirely different from that for a small fire. These concerns will be pointed out and briefly discussed in this paper. Further, the resultant aerodynamics induced by the sprinklers and the big fire would affect the performance of the smoke exhaust system protecting the atrium. The design concept of integrating long-throw sprinkler with static smoke exhaust systems with natural vents in very deep underground halls should be explored more carefully as the consequence can be very serious. Indoor aerodynamics resulted from fire and sprinkler water spray is complicated. Loss in smoke buoyancy would not keep a stable layer at the top which would then move out from the natural vents. Safety of firemen moving down to a deep underground environment filled up with smoke and hot steam must be evaluated vigorously. It is obvious that the concept of long-throw sprinkler in a tall atrium storing high amounts of combustibles should be further explored with in-depth research. Performance of the system integrated with natural vents in very deep crowded underground railway stations with a tall hall should be vigorously evaluated. The physical hazards must be assessed carefully under big fires with systematic full-scale burning experiments. Before working out appropriate design guides, long-throw sprinkler installation can only be used in tall atria storing small amounts of combustibles." @default.
- W2183685253 created "2016-06-24" @default.
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- W2183685253 date "2012-01-01" @default.
- W2183685253 modified "2023-09-26" @default.
- W2183685253 title "NECESSITY OF IN-DEPTH EVALUATION OF LONG-THROW SPRINKLER INSTALLATION AT TALL ATRIA STORING HIGH AMOUNTS OF COMBUSTIBLES" @default.
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