The temperature in a compartment fire is crucial for fire risk assessment because it affects the growth of a compartment fire, the structural behavior of construction elements, etc. A previous model for predicting the temperature, both before and after flashover, using adiabatic gas temperatures has been developed. However, this model has only been verified by experimental data before flashover. Additionally, this model for predicting the temperature after flashover uses a correlation of heat release rate (HRR) at flashover; this correlation has not been verified adequately. Moreover, this correlation expresses the HRR at flashover not after flashover, and may not represent the HRR in the entire post-flashover period. This study conducted experiments to verify this model, particularly in the post-flashover period, in an enclosure whose dimension is one third of an ISO 9705 chamber. The opening of the enclosure was 0.8 m high, and with different widths of 0.1, 0.2 or 0.3 m for considering the ventilation-controlled fire behavior after flashover. Fuels used were gasoline and isopropanol. Firstly, this study compared the measured and calculated HRR at flashover. Experimental data showed that the measured HRRs were much lower than the calculated ones. Using the calculated HRRs in this model was not feasible. Finally, this study provided an alternative expression of the HRR after flashover based on the measured HRR to replace the calculated HRR. Experimental results showed that this model using the alternative expression can better predict the temperature after flashover.
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