4. An energy analysis on an existing specialist chemical plant was performed, the results are shown in Table Q4. Stream Name 1 2 3 4 Heat Capacity Flowrate (kW/K) 2.200 2.600 3.200 2.500 Target Supply Temperature Temperature (C) (C) 40 140 190 200 Table Q4: Stream data Minimum external heating duty = 127 kW Minimum external cooling duty = 355.5 kW Minimum temperature difference between the streams = 10C Hot Pinch temperature = 190C Cold Pinch temperature = 180C 190 230 40 75 (a) What are the three rules that must be observed when designing an optimum heat recovery network and explain what happens if the rules are broken? (b) Construct an energy design chart from the stream information shown in Table Q4. Calculate and show on the diagram the change of enthalpy for each stream above and below the Pinch. (c) Above the Pinch, design and draw a heat exchanger network which meets minimum energy targets. Describe and explain the steps taken to design the heat exchanger network. (d) Below the Pinch, design and draw a heat exchanger network which meets minimum energy targets. Describe and explain the steps taken to design the heat exchanger network.

4. An energy analysis on an existing specialist chemical plant was performed, the results are shown in Table Q4. Table Q4: Stream data Minimum temperature difference between the streams =10C Hot Pinch temperature =190C Cold Pinch temperature =180C Minimum external heating duty =127kW Minimum external cooling duty =355.5kW (a) What are the three rules that must be observed when designing an optimum heat recovery network and explain what happens if the rules are broken? (b) Construct an energy design chart from the stream information shown in Table Q4. Calculate and show on the diagram the change of enthalpy for each stream above and below the Pinch. (c) Above the Pinch, design and draw a heat exchanger network which meets minimum energy targets. Describe and explain the steps taken to design the heat exchanger network. (d) Below the Pinch, design and draw a heat exchanger network which meets minimum energy targets. Describe and explain the steps taken to design the heat exchanger network