To exchange heat between four streams with Tmin=25C, the heat exchanger network (HEN) in Figure 2 is proposed. Figure 2: Flowsheet and HEN of the process (a) Ascertain that the network in Figure 2 does not meet the minimum utility requirements. (10 marks) (b) Outline a HEN design with minimum utility requirements. (10 marks) (c) Based on the HEN in (b), construct a new flowsheet to show the position of interior and auxiliary heat exchangers. Show the heat duties and temperatures for each heat exchanger