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Heat Transfer
book

Heat Transfer

by Younes Shabany
December 2009
Intermediate to advanced content levelIntermediate to advanced
523 pages
18h 30m
English
CRC Press
Content preview from Heat Transfer
Heat Transfer Mechanisms 63
between zero and one, is a measure of how good the surface is in emitting radiation.
Table 4.3 gives emissivity values for some common surfaces [2].
Equation 4.11 for radiation heat transfer rate between an object and its large sur-
rounding can be written as:
QATT AT TTT
sssradsurrsurrs
=−=++εσ εσ()()(
44 22
uurrsurr
)( ).TT
s
If we dene
hTTTT
ssradsurrsurr
=+ +εσ()()
22
, (4.15)
then
QhAT T
sradrad surr
=−()
. (4.16)
This equation is similar to Newton’s law of cooling for convection heat transfer rate
and h
rad
is called radiation heat transfer coefcient.
Although Equation 4.16 is similar to Newton’s law of cooling it uses ...
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Publisher Resources

ISBN: 9781439814680