a) Explanation Given: Maximum pressure in the cycle ( P 3 ) is 6 MPa . Minimum pressure in the cycle ( P 1 ) is 7 .5 kPa . Rate at which heat is transferred to the steam ( Q ˙ in ) is 40,000 kJ / s . Temperature of steam at the condenser ( T 2 ) is 15 ° C . Calculation: Draw the T − s diagram of the cycle as in Figure (1). The pressures are constant for the process 2 to 3 and process 4 to 1. P 2 = P 3 P 4 = P 1 The entropies are constant for the process 1 to 2 and process 3 to 4. s 1 = s 2 s 3 = s 4 Refer Table A-5, “Saturated water-Pressure table”, obtain the specific enthalpy, specific volume and temperature at state 1 corresponding to the pressure of 7 .5 kPa . h 1 = h f @ 7.5 kPa = 168.75 kJ / kg v 1 = v f @ 7.5 kPa = 0.001008 m 3 / kg T 1 = T sat @ 7.5 kPa = 40.29 ° C Calculate the work done by the pump during process 1-2 ( w p,in ) . w p,in = v 1 ( P 2 − P 1 ) = ( 0.001008 m 3 / kg ) ( 6000 kPa − 7 b) To determine The net power output and the thermal efficiency. (c) To determine The mass flow rate of the cooling water.

5th Edition

ISBN: 9780078027680

Author: Yunus A. Cengel Dr., Robert H. Turner, John M. Cimbala

Publisher: McGraw-Hill Education

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Chapter 9, Problem 178RQ

To determine

The turbine inlet temperature.

To determine

The net power output and the thermal efficiency.

(c)

To determine

The mass flow rate of the cooling water.

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Chapter 9, Problem 177RQ

Chapter 9, Problem 179RQ

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Fundamentals of Thermal-Fluid Sciences

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