Final_Sp96

# Final_Sp96 - ME 326 THERMODYNAMICS I Final Exam Open Book...

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ME 326: THERMODYNAMICS I Final Exam, May 11, 1996 Open Book 1) (20%) A steam power plant (Rankine cycle) operates as shown below. The overall cycle efficiency is measured as h R =23%. The pump is isentropic. (a) Fill in the state table except where XXX appears. (b) What is the turbine efficiency h t ? State T(°C) P(kPa) h(kJ/kg) s(kJ/kg•K) x 1 XXX 8 ( ) XXX 0.0 2 XXX 1500 ( ) XXX XXX 3 650 1500 ( ) ( ) XXX 4s XXX 8 ( ) ( ) ( ) 4a XXX 8 ( ) XXX XXX 2) (20%) An isobaric mixing chamber is to provide a mixture of argon and oxygen for an underwater breathing system. The final mixture must have 20% oxygen, 80% argon by volume , and have an outlet temperature from the mixing chamber of 100°C. The inlet oxygen to the chamber has a mass flow rate of 0.1 kg/s and a temperature of 50°C. What mass flow rate (kg/s) and what temperature (°C) of argon must be supplied to the chamber if the chamber has a 25 kW electrical heater inside? 3. (20%)

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Final_Sp96 - ME 326 THERMODYNAMICS I Final Exam Open Book...

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