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The heat release rate (HRR) is often the most important quantity to characterize fire growth and suppression. However, it is still a challenge to obtain a time-resolved HRR for a fire experiment conducted under a ceiling. This work proposes a new method to calculate the convective and chemical HRRs for a fire under a ceiling. The instantaneous measurements of gas temperature, velocity and species concentration in the ceiling layer are used to calculate the HRRs. To verify the proposed method, two heptane pan fire tests are conducted under a ceiling and the chemical HRR is calculated from the fuel mass loss data. The results show that the proposed method can provide a time-resolved chemical HRR that is comparable to that obtained from the fuel mass loss rate. The fraction of convective HRR to chemical HRR also agrees well with the test data obtained under a calorimeter.
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