Figure below shows an insulated co-current core-shell heat exchanger with air and water flowing through the inner and outer channels, respectively. The device is used to cool down the air stream. The known properties of each stream are listed on the figure. Air can be modeled as an ideal gas. Effect of potential and kinetic energy are neglected. P = 1.0 bar T = 20 C Cooling water 1 P3 = 1.0 bar T3 = 280 C 3 m3 = 145 kg/h P4 = 1.3 bar 4 air T = 527 C m = 1000 kg/h Cooling water P2 = 1.0 bar 2 T = 50 C 5 Ps = 1.0 bar T5 = 127 C (a) (15 pts) Find the mass flow rates for each water inlet (streams 1 and 2), in kg/h. (b) (12 pts) Calculate the generation of entropy , in kW/K. You do not need to find entropy for water stream; use s = 0.3 kJ/kg K, S = 0.7kJ/kgK, S3 = 8.2 kJ/kg.K. (c) (3 pts) Is the process reversible or irreversible? (d) (5 pts) Can you propose two alternative ways to improve the performance of the heat exchanger? Hints: Pay attention to details when using tables. If data missing from table, use proper assumptions.