Explanation The given cycle is the simple Rankine cycle with water as the working fluid and operated at the boiler and condenser pressures of 5 MPa and 10 kPa respectively. The simple Rankine cycle involves following processes and following conditions: Processes: 1. Process 1 to 2 – Isentropic compression in a Pump 2. Process 2 to 3 – Heat addition at constant pressure in a Boiler 3. Process 3 to 4 – Isentropic expansion in a Turbine 4. Process 4 to 1 – Heat rejection at constant pressure in a Condenser Conditions: The pressure is constant for the process 2 to 3 and the process 4 to 1. P 2 = P 3 and P 4 = P 1 The entropy is constant for the process 1 to 2 and the process 3 to 4. s 1 = s 2 and s 3 = s 4 Here, water is the working fluid. Write the formula for quality of water at the exit of the turbine (state 4) is expressed as follows. x 4 = s 4 − s f s f g (I) Here, the entropy is s , the quality of the water is x , the suffix f indicates the fluid condition, the suffix f g indicates the change of vaporization phase; the suffix 4 indicates the state 4. Write the formula for mass fraction. Mass fraction = 1 − x 4 (II) At state 3: (Turbine inlet) Refer Table A-6, “Superheated water”. The entropy ( s 3 ) at state 3 corresponding to the pressure of 5 MPa and the temperature of 600 ° C is 7.2605 kJ/kg ⋅ K . At state 4: (Condenser inlet) Refer Table A-5, “Saturated water-Pressure table”. Obtain the following properties corresponding to the pressure of 10 kPa

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Question

Chapter 10.9, Problem 122FEP

To determine

The mass fraction steam that condenses at the turbine exit from the following:

(a) 6 %

(b) 9 %

(c) 12 %

(d) 15 %

(e) 18 %

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Chapter 10.9, Problem 121FEP

Chapter 10.9, Problem 123FEP

Chapter 10 Solutions

EBK THERMODYNAMICS: AN ENGINEERING APPR

Ch. 10.9 - Why is the Carnot cycle not a realistic model for...Ch. 10.9 - Prob. 2P Ch. 10.9 - A steady-flow Carnot cycle uses water as the...Ch. 10.9 - A steady-flow Carnot cycle uses water as the...Ch. 10.9 - Consider a steady-flow Carnot cycle with water as...Ch. 10.9 - Consider a simple ideal Rankine cycle with fixed...Ch. 10.9 - Consider a simple ideal Rankine cycle with fixed...Ch. 10.9 - Consider a simple ideal Rankine cycle with fixed...Ch. 10.9 - How do actual vapor power cycles differ from...Ch. 10.9 - The entropy of steam increases in actual steam...

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