Carry out a formal pinch analysis of the process design presented as Step 8, using the UniSim \({ }^{\circledR}\) Design file NH3_PROCESS_4E_STEP_8 opt_V3.usc:

(a) Compute the MER targets assuming \(\Delta T_{\text {min }}=10^{\circ} \mathrm{C}\), and compare them with the total external heat duties implemented in Step 8.

(b) Plot the GCC and estimate the duties of each type of utility, again comparing the results with those implemented in Step 8.

(c) If there is a significant difference between the www.wiley. com/co l lege/seide rMER targets and the total external duties implemented in Step 8, suggest an alternative heat exchanger network to the one implemented to more closely match the MER targets, and modify the UniSim® Design case file to realize your HEN. Compute the profitability measures for your modified design and comment on the results.