BR 187 | Ch. 1 | Eq. 1

Calculates the Ventilation Factor

BR 187 | Appendix A - View Factors

Calculates the Incident Heat Flux on a receiving surface using pre defined configurations. center aligned can be used when the point of reference is in the center of the emitting surface. Corner aligned when the point of reference is in the corner of the emitting surface. When neither work perfectly, we can split the emitting surfaces into smaller parts and apply the appropriate alignment to each part. Adding and subtracting appropriately.

BS 9999 | Ch. 15 | Fig. 6a

Calculates the merging flow for stairs where the stair and storey exit share a common final exit

BS 9999 | Ch. 15 | Fig. 6b

Calcualtes the merging flow from stairs above and below the final exit level

BS 9999 | Ch. 15 | Fig. 6c

Calcualtes the merging flow from stairs above and below the final exit level, combined with with storey exit

CIBSE Guide E | Ch. 6 | Eq. 6.7

Heat Release Rate required for flashover. Most simple expression from SFPE Handbook

CIBSE Guide E | Ch. 6 | Eq. 6.55

Mean flame height of fires away from walls

CIBSE Guide E | Ch. 6 | Eq. 6.57

Height of the flame projection above the top of the opening

CIBSE Guide E | Ch. 6 | Eq. 6.58

Ventilation-controlled rate of burning for cellulosic fires

CIBSE Guide E | Ch. 6 | Appendix - 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

CIBSE Guide E | Ch. 6 | Appendix - More than one window

Relevant compartment dimensions for more than one window case. Users can define multiple individual openings, and the runner calculates equivalent dimensions.

CIBSE Guide E | Ch. 7 | Eq. 7.2

Capacity of a stair for simulataneous evacuation, subject to minimum stair widths

CIBSE Guide E | Ch. 7 | Eq. 7.3

Required width of the stair for simultaneous evacuation

CIBSE Guide E | Ch. 7 | Eq. 7.6

Maximum flow rate of persons through a doorway or level corridor

CIBSE Guide E | Ch. 7 | Eq. 7.7

Maximum number of people that can me accomodated within a stairway at any one time

CIBSE Guide E | Ch. 7 | Eq. 7.8

Maximum number of people able to enter the stair within a specified period without suffering extreme discomfort

CIBSE Guide E | Ch. 7 | Eq. 7.9

Maximum number of people able to enter the stair within a specified period given a certain occupant density in the stairs and landing

CIBSE Guide E | Ch. 10 | Eq. 10.1

Calculates the maximum volumetric flow rate, without plug-holing, by a single exhaust vent

CIBSE Guide E | Ch. 10 | Eq. 10.2

Calculates the miminmum separation distance between exhaust vents to prevent plug-holing

CIBSE Guide E | Ch. 10 | Eq. 10.3

Calculates the volumetric flow rate for a smoke exhaust if the mass flow rate is known and, considering temperature dependence of density

CIBSE Guide E | Ch. 10 | Eq. 10.4

Calculates the time to burning of skin due to radiant heat for heat fluxes above 1.7 kW/m2

CIBSE Guide E | Ch. 10 | Eq. 10.7

Calculates the visibility in smoke as a function optical density and a visibility coefficient

CIBSE Guide E | Ch. 10 | Eq. 10.8

Calculates the fractional effective dose

CIBSE Guide E | Ch. 10 | Eq. 10.10

Limiting average air velocity where opposed air flow is used to stop smoke spread from room of origin to a large volume

CIBSE Guide E | Ch. 10 | Eq. 10.11

Limiting average air velocity where opposed air flow is used to stop smoke spread from large space to adjoining small space below the smoke layer interface

CIBSE Guide E | Ch. 10 | Eq. 10.12

Limiting average air velocity where opposed air flow is used to stop smoke spread from an adjoining room into a corridor

Fire Dynamics Tools | Ch. 2 | Eq. 2.1

Calculates the hot gas temperature increase for naturally ventilated enclosures using the MQH correlation.

Fire Dynamics Tools | Ch. 2 | Eq. 2.2

Calculates the total interior surface area of a compartment excluding ventilation openings

Fire Dynamics Tools | Ch. 2 | Eq. 2.3

Calculates the heat transfer coefficient for long exposure times or thin walls

Fire Dynamics Tools | Ch. 2 | Eq. 2.4

Calculates the thermal penetration time for a wall boundary

Fire Dynamics Tools | Ch. 2 | Eq. 2.5

Calculates the heat transfer coefficient for short exposure times or thick walls

Fire Dynamics Tools | Ch. 2 | Eq. 2.6

Calculates the hot gas temperature increase using the Beyler method for forced ventilation

Fire Dynamics Tools | Ch. 2 | Eq. 2.7

Calculates the nondimensional hot gas temperature increase for naturally ventilated enclosures

Fire Dynamics Tools | Ch. 2 | Eq. 2.8

Calculates the steady state hot gas temperature increase for forced ventilation

Fire Dynamics Tools | Ch. 2 | Eq. 2.9

Calculates the convective heat transfer coefficient considering both short and long time behaviour

Fire Dynamics Tools | Ch. 2 | Eq. 2.10

Calculates the height of the smoke layer interface above the fire for natural ventilation

Fire Dynamics Tools | Ch. 2 | Eq. 2.11

Calculates the entrainment constant k for use in smoke layer height calculations

Fire Dynamics Tools | Ch. 2 | Eq. 2.12

Calculates the simplified entrainment constant k for use in smoke layer height calculations

Fire Dynamics Tools | Ch. 2 | Eq. 2.13

Calculates the density of the hot gas layer from the gas temperature

Fire Dynamics Tools | Ch. 4 | Eq. 4.1

Calculates the flame height for a fire against a wall

Fire Dynamics Tools | Ch. 4 | Eq. 4.2

Calculates the flame height for a line fire

Fire Dynamics Tools | Ch. 4 | Eq. 4.3

Calculates the flame height for a fire in a corner

Fire Dynamics Tools | Ch. 5 | Eq. 5.1

Calculates the thermal radiation from a point source fire

Fire Dynamics Tools | Ch. 9 | Eq. 9.2

Calculates the maximum centerline temperature rise in a fire plume

Fire Dynamics Tools | Ch. 9 | Eq. 9.3

Calculates the virtual origin to diameter ratio for a fire plume

Fire Dynamics Tools | Ch. 9 | Eq. 9.4

Calculates the effective diameter of a non-circular fire source

Fire Dynamics Tools | Ch. 18 | Eq. 18.1

Calculates the visibility through smoke

Fire Dynamics Tools | Ch. 18 | Eq. 18.2

Calculates the concentration of particulates in a compartment

Fire Dynamics Tools | Ch. 18 | Eq. 18.3

Calculates the mass of particulates produced from burning

Introduction to Fire Dynamics | Ch. 10 | Eq. 10.18

Determines the burning regime in a compartment fire with wood or wood-based fuels.

Introduction to Fire Dynamics | Ch. 6 | Eq. 6.32

Calculates the time to ignition for thermally thick solids using Drysdale's equation 6.32.

Introduction to Fire Dynamics | Ch. 6 | Eq. 6.33

Calculates the time to ignition for a thermally thin solid assuming a constant external heat flux and ignoring heat losses

PD 7974-1 | Eq. 41, 42, 43 & 44

Calculates the maximum enclosure temperature after flashover

PD 7974-1 | Eq. 28 & 29

Calculates the HRR at flashover, comparing methods developed by Thomas and McCaffrey et al.,

PD 7974-1 | Eq. 4 & 33

Calculates the maximum HRR for a compartment fire, comparing fuel-controlled and ventilation-controlled conditions

SFPE Handbook | Ch. 14 | Eq. 14.2 & 14.3

Calculates the heat release at which a heat detector submerded in the ceiling jet will activate

SFPE Handbook | Ch. 50 | Eq. 50.1

Calculates the pressure difference between indoor and outdoor environments due to stack effect

SFPE Handbook | Ch. 50 | Eq. 50.2

Calculates the pressure difference between a fire compartment and its surroundings

SFPE Handbook | Ch. 50 | Eq. 50.4

Calculates the wind pressure on a building surface

SFPE Handbook | Ch. 50 | Eq. 50.6

Upper limit for the piston effect for an elevator with enclosed lobbies

SFPE Handbook | Ch. 50 | Eq. 50.7

Calculates the effective leakage area for pressurization systems

SFPE Handbook | Ch. 50 | Eq. 50.14

Calculates the force required to open a door against a pressure difference

SFPE Handbook | Ch. 50 | Eq. 50.15

Calculates the maximum height for effective stairwell pressurization

SFPE Handbook | Ch. 50 | Eq. 50.16

Calculates the flow area factor for pressurization system design

SFPE Handbook | Ch. 50 | Eq. 50.17

Calculates the stairwell temperature based on outdoor and building temperatures when the pressurisation air is untreated

SFPE Handbook | Ch. 50 | Eq. 50.19

Calculates visibility through smoke based on mass concentration

SFPE Handbook | Ch. 50 | Eq. 50.20

Calculates visibility through smoke based on percent obscuration

SFPE Handbook | Ch. 59 | Eq. 59.5

Calculates pedestrian travel speed along a path based on population density

SFPE Handbook | Ch. 59 | Eq. 59.6

Calculates the specific flow of evacuating persons per unit time per unit effective width

SFPE Handbook | Ch. 59 | Eq. 59.7

Calculates specific flow directly from population density by combining Equations 59.5 and 59.6

SFPE Handbook | Ch. 59 | Eq. 59.8

Calculates the flow rate of persons passing a point in an exit route

SFPE Handbook | Ch. 59 | Eq. 59.9

Calculates flow rate directly from fundamental parameters by combining Equations 59.7 and 59.8

SFPE Handbook | Ch. 59 | Eq. 59.10

Calculates the time for a group of persons to pass a point in an exit route

SFPE Handbook | Ch. 59 | Eq. 59.11

Calculates time for passage directly from fundamental parameters by combining Equations 59.9 and 59.10

SFPE Handbook | Ch. 59 | Eq. 59.12

Calculates the specific flow departing from a transition point with one incoming flow

SFPE Handbook | Ch. 59 | Eq. 59.13

Calculates the specific flow departing from a transition point with two incoming flows

SFPE Handbook | Ch. 59 | Eq. 59.15

Calculates evacuation time when congestion dominates the results

SFPE Handbook | Ch. 59 | Eq. 59.16

Calculates evacuation time when congestion does not dominate the results

TR 17 | Section 2 | Eq. 1

Calulates the non-dimensional Heat Release Rate

Misc | Evacuation | Travel Time

Calculates travel time from distance and walking speed

Misc | Evacuation | Travel Distance

Calculates travel distance from walking speed and travel time

Misc | Evacuation | Walking Speed

Calculates walking speed from travel distance and travel time

Misc | Fire Dynamics | HRR from HRRPUA

Calculates the total heat release rate from the heat release rate per unit area and fire area