Final_F95 - ME 326: THERMODYNAMICS I Final Exam, Dec. 11,...

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ME 326: THERMODYNAMICS I Final Exam, Dec. 11, 1995 Open Book Section 1) (20%) A steam power plant (Rankine cycle) operates as shown below. The turbine efficiency is 75% and the pump is isentropic. (a) Fill in the state table except where XXX appears. (b) What is the thermal efficiency h R of the plant? State T(°C) P(kPa) h(kJ/kg) s(kJ/kg•K) x 1 ( ) 8 ( ) ( ) 0.0 2 ( ) 1000 ( ) ( ) XXX 3 600 1000 ( ) ( ) XXX 4s ( ) 8 ( ) ( ) ( ) 4a ( ) 8 ( ) XXX XXX 2) (20%) The jet engine shown above has a compressor with efficiency of 80 percent. Inlet air to the compressor passes through a diffuser, and enters the compressor at 25°C, 1 atm. and the turbine inlet temperature is limited to 1200°C. The compressor pressure ratio is 10. The turbine is ideal (isentropic). The nozzle exit temperature is measured to be 800°C. Use the air tables to find all properties and for all solutions. State T(°C) P(atm) h(kJ/kg) V(m/s) 1 25 1 ( ) ˜0 2s XXX 10 ( ) ˜0 2a ( ) 10 ( ) ˜0 3 1200 10 ( ) ˜0
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Final_F95 - ME 326: THERMODYNAMICS I Final Exam, Dec. 11,...

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