A HEN is to be designed to meet MER targets for the following stream data:

(a) Compute MER targets for this process at \(\Delta T_{\text {min }}=10^{\circ} \mathrm{C}\).
(b) Design a HEN to meet the MER targets at \(\Delta T_{\min }=20^{\circ} \mathrm{C}\) with no more than 10 heat exchangers (including utility heaters and coolers).
(c) Draw the GCC for this process and use it to suggest changes to the HEN to reduce operating costs. In so doing, note that there are no restrictions in the number of units.

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Stream T (C) T' (C) C (kWC) HI 850 400 4 H2 600 30 3 H3 400 300 10 CI 80 300 15 C2 150 650 3 C3 100 200 C4 60 180 21