KNOWN: Thicknesses and thermal conductivities of refrigerator wall materials. Inner and outer air
temperatures and convection coefficients.
FIND: Heat gain per surface area.
ASSUMPTIONS: (1) One-dimensional heat transfer, (2) Steady
Given: A section of a composite wall with bolts as shown below. The heat conduction
is 1-D, steady with constant properties.
Find: An expression for .
The thermal resistances circuit for this heat conduction problem is