Liquid water at 19.1 psig and 15°C is heated in a mixing chamber by mixing it with superheated steam at 150°C. Liquid water enters the mixing chamber at a rate of 4.3 kg/s and the chamber is estimated to lose heat to the surrounding air at 20°C at a rate of 1200 kJ/min. If the mixture is intended to leave at 80°C please answer the following. a. What should be the pressure at the inlet of the liquid water and the steam to have a good operating mixing chamber? Explain how you arrived to the value and what would happen if values for the inlet streams would be different. b. What should the pressure at the exit of the mixture be under ideal conditions? Why? c. Determine the mass flow rate of the superheated steam. d. Determine the rate of entropy generation in this mixing chamber. Could this mixing chamber operate under the given conditions? Please justify your answer with explanations. e. If the mixing chamber would have been adiabatic, is there any entropy generation? Perform a computation to support your answer. Would the operation under those conditions be feasible?
Liquid water at 19.1 psig and 15°C is heated in a mixing chamber by mixing it with superheated steam at 150°C. Liquid water enters the mixing chamber at a rate of 4.3 kg/s and the chamber is estimated to lose heat to the surrounding air at 20°C at a rate of 1200 kJ/min. If the mixture is intended to leave at 80°C please answer the following.
a. What should be the pressure at the inlet of the liquid water and the steam to have a good operating mixing chamber? Explain how you arrived to the value and what would happen if values for the inlet streams would be different.
b. What should the pressure at the exit of the mixture be under ideal conditions? Why?
c. Determine the mass flow rate of the superheated steam.
d. Determine the rate of entropy generation in this mixing chamber. Could this mixing chamber operate under the given conditions? Please justify your answer with explanations.
e. If the mixing chamber would have been adiabatic, is there any entropy generation? Perform a computation to support your answer. Would the operation under those conditions be feasible?
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