PROBLEM 1.12
KNOWN: Dimensions and thermal conductivity of food/beverage container. Inner and outer
surface temperatures.
FIND: Heat flux through container wall and total heat load.
SCHEMATIC:
ASSUMPTIONS: (1) Steady-state conditions, (2) Negligible heat

PROBLEM 5.6
KNOWN: Diameter and initial temperature of steel balls cooling in air.
FIND: Time required to cool to a prescribed temperature.
SCHEMATIC:
ASSUMPTIONS: (1) Negligible radiation effects, (2) Constant properties.
ANALYSIS: Applying Eq. 5.10 to a

PROBLEM 2.8
KNOWN: Temperature dependence of the thermal conductivity, k(T), for heat transfer through a
plane wall.
FIND: Effect of k(T) on temperature distribution, T(x).
ASSUMPTIONS: (1) One-dimensional conduction, (2) Steady-state conditions, (3) No i

PROBLEM 4.9
KNOWN: Heat generation in a buried spherical container.
FIND: (a) Outer surface temperature of the container, (b) Representative isotherms and heat
flow lines.
SCHEMATIC:
ASSUMPTIONS: (1) Steady-state conditions, (2) Soil is a homogeneous medi

An alternative (and easier) way to calculate qcond,i was to use Table 3.4, for a fin of uniform cross-section,
with a prescribed temperature,
cosh
=
sinh
With =
and =
P is the perimeter of the fin, Ac the cross-sectional area, = 0 , =
qf = qcond,i