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PD 7974-1 | Eq. 28 & 29
HRR at flashover
Calculates the HRR at flashover, comparing methods developed by Thomas and McCaffrey et al.,
Reference
BSI, 2019. PD 7974-1: Application of Fire Safety Engineering Principles to the Design of Buildings - Initiation and Development of Fire within the Enclosure of Origin (Sub-system 1). BSI
Equations
Input | Eq. 28
\dot{Q}_{fo, \space Thomas} = 7.8 \cdot A_t + 378 \cdot A_v \cdot H_v^{1/2}
Input | Eq. 29 (Optional)
\dot{Q}_{fo, \space McCaffrey} = 610 \left(h_k \cdot A_t \cdot A_v \cdot H_v^{1/2} \right)^{1/2}