Tc,A,i = 311 K Two heat exchangers arranged in a two-stage array with only one cold stream flowing through both units, as shown in Fig. 1. For a minimum surface area requirement, both are counter-flow exchangers. a. Determine the optimum inter-stage temperature. b. Determine the surface area of each of the two exchangers for a minimum total heat transfer surface area. c. Compare the solution to a single exchanger solution. Thao A Hot fluid, stage A Tc,A,O= Tc,B,i Th,B,0 B Hot fluid, stage B Th,A,i = 422K Cold fluid with CC,A= CC,B=CC= 52,740 W/K Ch,A = Ch, B = CC UA-=UB= 454 W/mK Figure 1. Two heat exchangers with one cold stream flowing through both units. TC,B,0 = 533 K Th,B,i = 589K