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hw 10 - turbine at 7 MPa and 500 o C The steam exits the...

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EML 3100 Thermodynamics HW Set 10 Due December 1, 2010 1. (a) Compare the differences in the four processes between the Carnot and ideal Rankine cycles (b) please explain why the State 1 (condenser outlet and pump inlet) and State 3 (boiler outlet and turbine inlet) in the ideal Rankine cycle are different from those in the Carnot cycle. 2. Consider a 300 MW steam power plant that operates on an ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500 o C and exits at 10 kPa. Show the cycle on a T-s diagram with respect to the saturation lines. Determine (a) the quality of steam at the turbine exit, (b) the thermal efficiency of the cycle, (c) the steam mass flow rate and (d) the equivalent Carnot cycle efficiency. 3. A steam power plant has been designed based on the ideal Rakine cycle with the following conditions. It has a net power output of 30 MW and the steam enters the
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Unformatted text preview: turbine at 7 MPa and 500 o C. The steam exits the turbine at 10 kPa and is cooled in the condenser by cooling water from a lake at 16 o C with a flow rate of 2000 kg/s through tubes. Show the cycle on a T-s diagram with respect to saturation lines and determine (a) the Cycle thermal efficiency, (b) the steam mass flow rate and (c) the cooling water exit temperature. 4. A steam power plant operates on an ideal reheat Rankine cycle. The steam enters the high pressure turbine at 8 MPa and 500 o C and then leaves at 3 MPa. The steam is then reheated at constant pressure of 3 MPa to 500 o C before it expands in a low pressure turbine to exit at 20 kPa. Determine the total specific turbine work and thermal efficiency of the cycle. Also show the cycle on a T-s disgram with respect to saturation lines....
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