1.      What are three common ways that heat is transferred between objects?

2.      Give general equations for those three ways listed in Question 1.

3.      What is the thermal resistance of a wall of surface area of 120 m², and consists of two components.  Temperatures at edges and the interface of the two materials is given.

4.      Heat is transferred by conduction through a wall consisting of two materials, as shown below.  The temperature on one side of the wall is -5 °C and on the other is 25 °C.  What is the heat transfer through the wall?

5.      A polymer film (k = 0.3 W/m*K) that is 30 microns thick is extrusion coated to aluminum foil (k = 177 W/m*K) that is 50 microns thick and is used in a liquid packaging application.  The liquid on the polymer side has a film coefficient of 5 W/m²*K and a temperature of 25 °C.  The liquid on the aluminum side has a film coefficient of 30 W/m²*K and a temperature of 90 °C.  Assuming that steady state conditions have been met, what is the approximate temperature of the interface?  Solving such a problem is critical in modeling the filling process of packages with hot liquids.