For the identical average inlet and outlet fluid temperatures, arrange the following exchangers in..

For the identical average inlet and outlet fluid
temperatures, arrange the following exchangers in terms of decreasing largest
structural temperature differences across the wall thickness direction:

(a) parallelflow (b) counterflow (c) four-pass overall
crosscounterflow

(d) two-pass overall cross-counterflow (e) single-pass
crossflow

Now can you tell which exchanger will have the highest
thermal stresses in the dividing walls between two fluids and which will have
the least thermal stresses? Why? Hint: Review the temperature distributions of
the hot and cold fluids and of the wall.