
387Fires
or
Q
rr
krr
R
=
−
=
()
4
12
21
π
(12.67)
e preceding equations will allow for the solution of most problems encountered by the
forensic engineer with respect to the solution of the transfer of heat through conduction.
We now turn our attention to thermal radiation.
ermal radiation is produced by a dierential in temperature. ermal radiation is
continuously produced over a wide range of frequencies. Generally when investigating
res, we are only interested in the frequencies near the visible range. Figure 12.8 shows a
part of the electromagnetic spectrum. e abundance of the radiated heat in a re is in the
infrared region with some extendi ...