Question

10. The UTC chemical engineering program is looking to purchase a new reboiler (a type of heat ZUVOR exchanger) for the distillation column in EMCS 120. In the design specifications, liquid water enters the heat exchanger at T = 100°C and P = 3 MPa. The total heat transferred to the water, from a resistance heater at T = 1727°C, is 1000 kW. The outlet temperature and pressure of the water is 500°C and 3 MPa. The mass flow rate of the water through the heat exchanger is 0.5 kg/s. a) (15 pts) At what rate is entropy generated during this process (kW/K)? b) (5 pts) Does this process satisfy the 2nd law based on your answer from part (a)? Explain. c) (5 pts) Name at least one irreversibility that could be contributing to the entropy generated.

Answer 1

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hamic pieces Change in entropy for a thermodynamic pe for ideal behaviour is given by AS = hcp en (T2) h: no. of moles of water flowing We have water flow rate = 0.5kg x 1 kmol sec 18 kg -0.027 kmol of also we can proceed with mass flowrate of water . As = 0.58 4.18 7 x in (500t 273 A loot 273 / As = 1.52 km k. b) As a condition of second law of thermodynamics we bronne know that entropy of system is always increasing for irreversible e Asto feasible process! Here AS = 1.527o Given process doesn't violate second law of thermodynamic O The heat provided to the system causes losses in the transfer process of heat. Thus it leads to the genration of entropy or irreversibility of process.