carbon dioxide enters a nozzle operating at steady state at 50 msec 28
Carbon dioxide enters a nozzle operating at steady state at 50 m/sec, 28 bar, and267°C. The conditions at the exit are 580 m/sec, 1.2 bar, and 67 °C. (a) For a control volume enclosing the nozzle only, determine the heat transfer, in kJ, per kg of carbon dioxide and the change in the specific entropy between the inlet and the exit, in kJ/(kg K). What additional information would be required to evaluate the rate of entropy production? Ans: -26.78 kJ/kg, 0.1497 kJ/(kg-K) (b) Use a control volume enclosing the nozzle and a portion of its immediate surroundings at the temperature of25 °C, and determine the entropy production per mass, in kJ/(kg K). Ans: 0.2396kJ/(kg-K)
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