Smoke Control Design: smoke_filling
Smoke control design parameters per NFPA 92-2021 and IBC 2021 Section 909 — stairwell and elevator pressurization differentials (0.05–0.10 in. w.g.), door opening force limits (30 lbf max), atrium exhaust prescriptive rates (4–6 ACH), axisymmetric and balcony/window plume mass flow equations (NFPA 92 Eq. 4.1, 4.10, 4.12), design fire heat release rates by occupancy (1000–5000 kW), building leakage areas by tightness class (tight/average/loose), door leakage areas, t² fire growth coefficients, tenability criteria (visibility 16–33 ft, temperature 120°C max, CO FED thresholds), and the smoke filling rate formula. Sources: NFPA 92-2021, IBC 2021 Sec. 909, ASHRAE Handbook HVAC Applications Ch. 54, Klote/Milke Handbook of Smoke Control Engineering.
| smoke control type | record id | description | formula or method | notes | unit | value typical |
|---|---|---|---|---|---|---|
| smoke_filling | unsteady_alpha_fast | Fire Growth — Fast t² Fire Growth Coefficient | Q = alpha * t^2 | Fast t² fire: Q = 0.0469 * t²; reaches 1000 kW in 150 s; typical for retail with plastic commodities | kW/s2 | 0.0469 |
| smoke_filling | unsteady_alpha_medium | Fire Growth — Medium t² Fire Growth Coefficient | Q = alpha * t^2 | Medium t²: Q = 0.01172 * t²; reaches 1000 kW in 300 s; typical for office occupancies | kW/s2 | 0.01172 |
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