QUESTION 3 (20 marks) A heat-exchanger (Figure 2) uses carbon dioxide to cool down steam entering at 500C and 8 bar. The carbon dioxide enters at 200 kPa and 300 K, with a velocity of 100 m/s. At the exit, the pressure and velocity are 94.13 kPa and 400 m/s, respectively. CO, 100 m/s 200 kPa 300 K Steam 500C 8 bar 8 bar 94.13 kPa 400 m/s Figure 2: Heat Exchanger a) b) Neglecting the potential energy effects, find the temperature of CO2 at the exit. Determine the amount of heat per unit mass, Jin, that can be received by the carbon dioxide. Assume a constant specific heat for CO2, Cp = 0.94 kJ/kg.K What is the enthalpy, and temperature of the water leaving the heat exchanger? e)