9th Edition

ISBN: 9781266084584

Author: CENGEL

Publisher: MCG

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Chapter 10.9, Problem 47P

How do the following quantities change when the simple ideal Rankine cycle is modified with regeneration? Assume the mass flow rate through the boiler is the same.

Turbine work output: (a) increases, (b) decreases, (c) remains the same

Heat supplied: (a) increases, (b) decreases, (c) remains the same

Heat rejected: (a) increases, (b) decreases, (c) remains the same

Moisture content at turbine exit: (a) increases, (b) decreases, (c) remains the same

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Chapter 10.9, Problem 46P

Chapter 10.9, Problem 48P

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1. Why is excessive moisture in steam undesirable in steam turbines? What is the highest moisture content allowed? 2. Why is the Carnot cycle not a realistic model for steam power plants? 3. Consider a simple ideal Rankine cycle with fixed turbine inlet conditions. What is the effect of lowering the condenser pressure on Pump work input: (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, (c) remains the same (a) increases, (b) decreases, Turbine work output: Heat supplied: Heat rejected: Cycle efficiency: Moisture content at turbine exit: (c) remains the same 4. Consider a simple ideal Rankine cycle with fixed boiler and condenser pressures. What is the effect of superheating the steam to a higher temperature on Pump work input: (a) increases, (b) decreases, (c) remains the same (a) increases, (b)…

* The system diagram and a number of the state properties are given below for a regenerative Rankine cycle. The isentropic efficiency of both turbines is 85% and the isentropic efficiency of the pump is 90%. Using the provided state data below, detemine the: (a) Percent of diverted flow after the first turbine, y (b) The thermal efficiency of the cycle, ncyc (c) The entropy production rate at the closed feedwater heater per mass flow of steam entering the first turbine "FWH, in [kJ/kg-K] State T ("C) p (kPa) h (kJ/kg) s (kJ/kg-K) 480 10000 3323 6.531 172.4 700 2781 6.749 2s 164.9 2686 6.531 |3[a -» 3 36.16 6. 2183 7.09 (y) 3s 36.16 2078 6.749 Steam 4 36.16 151.5 0.5208 Condenser generator 5 36.69 162.6 0.5244 (1) 0.5208 1.98 5s 36.43 161.5 Pump 6. 164.9 702.3 7 164.9 697 1.992 |t 8 36.16 697 2.285 Closed feedwater heater Trap (y) (v)

Chapter 10 Solutions

THERMODYNAMICS: ENG APPROACH LOOSELEAF

Ch. 10.9 - Why is the Carnot cycle not a realistic model for...Ch. 10.9 - Why is excessive moisture in steam undesirable in...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 - Water enters the boiler of a steady-flow Carnot...Ch. 10.9 - What four processes make up the simple ideal...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...

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