p19_109.pdf

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Chapter 19 - 19.109
109. (a) The8 . 0cmthicklayerofairinfrontoftheglassconductsheatatarateof
P cond = kA T H −
T C
=(0 . 026)(0 . 36) 15
0 . 08 =1 . 8W
L
which must be the same as the heat conduction current through the glass if a steady-state heat
transfersituationisassumed.
(b) Fortheglasspane,
P cond = kA T H −
T C
L
1 . 8=(1 . 0)(0 . 36) T H −
T C
0 . 005
whichyields T H −
T C =0 . 024C ◦ .
 

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