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Abstract

The heat transfer from fires to adjacent surfaces is an important consideration in many fire analyses. Some example applications that may require knowledge of the heat transfer from a flame include heating and failure of structural beams, heat transfer through walls and ceilings, and the ignition and flame spread along combustible surfaces.

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Nomenclature, Greek Letters and Subscripts

a

spacing between parallel walls (m)

C p

specific heat capacity of air at 300 K (0.998 kJ/[kg-K])

d

length of single side on L-shape burner, length of line burner, width of burning area on corner wall (m)

D

length of single side of square burner, diameter (m)

g

acceleration of gravity (9.81 m/s2)

H

distance between fire and ceiling (m)

H B

distance between fire and lower flange of I-beam (m)

H C

distance between fire and upper flange of I-beam (m)

H o

height of room window (m)

h

convective heat transfer coefficient (kW/[m2 -K])

k

thermal conductivity (kW/m-K)

L B

flame tip length along lower flange of I-beam (m)

L C

flame tip length along upper flange of I-beam (m)

L web

flame tip length along center of web on I-beam (m)

L f

average flame length (m)

L f,tip

flame tip length (m)

L H

flame extension along ceiling away from stagnation point (m)

Q

fire heat release rate (kW)

Q

fire heat release rate per unit width (kW/m)

Q*

dimensionless parameter, \( {Q}_D^{*}=\frac{Q}{\uprho_{\infty }{C}_p{T}_{\infty}\sqrt{g}{D}^{5/2}} \), with D being length scale

r

distance from corner or stagnation point to measurement location (m)

q

heat flux (kW/m2)

T f

local gas temperature (K)

T g

room gas temperature (K)

T s

material surface temperature (K)

T

ambient temperature (300 K)

W o

width of room window (m)

w

dimensionless distance along ceiling or I-beam, \( w=\left(r+{H}_B+{z}^{\prime}\right)/\left({L}_{HB}+{H}_B+{z}^{\prime}\right) \)

x

horizontal coordinate (m)

y

horizontal coordinate (m)

y

distance from center of line burner, \( {y}^{\prime }=0.5d-y (m) \)

Z

burner height (m)

z

vertical coordinate (m)

z

virtual source location (m)

ε

material surface emissivity (−)

ρ

ambient density of air (1.2 kg/m3)

π

constant (3.14159)

σ

Stefan-Boltzman constant \( \Big(5.67\times {10}^{-11} kW/\left[{m}^2-{K}^4\right]\Big) \)

cl

centerline

conv

convective

d

defined using d as length scale

D

defined using D as length scale

H

defined using H as length scale

hfg

heat flux gauge

B

defined using H B as length scale

C

defined using H C as length scale

web

defined using Hweb as length scale

inc

incident

m

measured

max

max level

net

net

peak

peak

rad

radiative

rr

reradiated

s

material surface

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Lattimer, B.Y. (2016). Heat Transfer from Fires to Surfaces. In: Hurley, M.J., et al. SFPE Handbook of Fire Protection Engineering. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-2565-0_25

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