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Chapter 1
Basics of Heat Transfer
Heat and Other Forms of Energy
18C
The rate of heat transfer per unit surface area is called heat flux
. It is related to the rate of heat
transfer by
.
&
q
∫
=
A
dA
q
Q
&
&
19C
Energy can be transferred by heat, work, and mass. An energy transfer is heat transfer when its
driving force is temperature difference.
110C
Thermal energy is the sensible and latent forms of internal energy, and it is referred to as heat in
daily life.
111C
For the constant pressure case. This is because the heat transfer to an ideal gas is
mC
p
Δ
T
at constant
pressure and
mC
p
T
at constant volume, and
C
p
is always greater than
C
v
.
112
A cylindrical resistor on a circuit board dissipates 0.6 W of power. The amount of heat dissipated in
24 h, the heat flux, and the fraction of heat dissipated from the top and bottom surfaces are to be
determined.
Assumptions
Heat is transferred uniformly from all surfaces.
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 Fall '10
 Dr.DanielArenas
 Thermodynamics, Energy, Mass, Work, Heat

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