CIBSE Guide E | Ch. 6 | Appendix - Simple case

Dimensions of a room or compartment (simple case)

Relevant compartment dimensions for the simple case, which is a compartment with a single opening. These dimensions are then used in empirical correlations to predict fire dynamics

Reference

CIBSE (Chartered Institution of Building Services Engineers), 2019. CIBSE Guide E: Fire Safety Engineering. 4th edn. London: CIBSE.

Equations

Input | Compartment dimensions

A_f = w_1 \cdot w_2

Input | Opening dimensions

A_o = w_o \cdot h_o

Input | Internal surface area

A_{net} = 2 \cdot A_f + 2 \cdot h (w_1 + w_2) - A_o

Input | Ratio of opening width to opening depth

d/w = w_2 / w_1

Inputs

Width of the wall containing the opening ( w_1 ) — m

Sweep Goal seek

Width of the wall not containing the opening ( w_2 ) — m

Sweep Goal seek

Width of the opening ( w_o ) — m

Sweep Goal seek

Height of the opening ( h_o ) — m

Sweep Goal seek

Floor to ceiling height or height above base of fire ( h ) — m

Sweep Goal seek