hw12 - Prob 10.3 PROBLEM 10.3 PROBLEM STATEMENT: A steam...

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Prob 10.3 PROBLEM 10.3 PROBLEM STATEMENT: A steam power plant operates on the ideal Rankine cycle. The steam leaves the turbine at a pressure of 0.2 MPa and quality 0.98. The turbine produces 1500 kW of power. If the mass flow rate is 1.5 kg/s, find: (a) The net power output. (b) The cycle thermal efficiency. DIAGRAM DEFINING SYSTEM AND PROCESS: GIVEN: Steam (H 2 O) operating on an ideal Rankine cycle with superheat P 4 = 0.2 Mpa = P 1 , x 4 = 0.98 == & & OUT,TURBINE W1 5 0 0 k W , m 1 . 5 k g / s FIND: Net power output η & NET RANKINE W (kW) and cycle thermal efficiency, ASSUMPTIONS: 1. Both the turbine and the pump are isentropic 2. No kinetic and potential energy effects 3. All processes of the steam are internally reversible 4. No pressure drop in boiler and condenser 5. Incompressible liquid in pump GOVERNING RELATIONS: Vapor power systems – Rankine cycle 1. =− && & NET OUT,TURBINE IN,PUMP Net power output, W W W 2. η= & & RANKINE NET IN Efficiency, W /Q 3. 2 1 P IN,PUMP P W vdP ( ICL ) m = & & QUANTITATIVE SOLUTION: The specific enthalpy value at the turbine entrance (h 3 ) can be determined from an energy balance on the turbine: = + & & & & OUT,TURBINE OUT,TURBINE 3 4 3 4
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This homework help was uploaded on 03/19/2008 for the course ME 326 taught by Professor Schmidt during the Spring '07 term at University of Texas.

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hw12 - Prob 10.3 PROBLEM 10.3 PROBLEM STATEMENT: A steam...

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