TED-AJ03-409 Positive Pressure Ventilation Attack for Heat Transport in a House Fire

概要

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Positive Pressure Ventilation Attack (PPV) is one method that is used to attack fires. There is still some controversy and lack of consensus on the effectiveness of this strategy in minimizing fire effects on firefighters and possible victims. This study was conducted to test the effects of PPV on victims/firefighters located downwind of the point of attack. The results shed light on the importance of exit vent location when using PPV during attack. This study uses experimental data from actual house burns conducted by the Austin Fire Department. The major variable in the study is the location of the exit vent opening. There were 21 thermocouples installed in the house to monitor interior temperatures. Video was recorded from four locations. There were two ventilation scenarios used. These are : fire vented close to the fire origin and fire vented close to the victim. The data are then examined by computational models. Two types of models are used to explore the experimental data. The two models are a zone model, Consolidated Fire and Smoke Transport (CFAST), and a Large Eddy Simulation Code, Fire Dynamics Simulator (FDS). Both models were developed by the National Institute of Standards and Technology (NIST). Comparisons are made between the two modeling approaches and the experimental data to aid in interpretation of the experiments.