Thermodynamics: An Engineering Approach
8th Edition
ISBN: 9780073398174
Author: Yunus A. Cengel Dr., Michael A. Boles
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 10.9, Problem 46P
A steam power plant operates on an ideal regenerative Rankine cycle. Steam enters the turbine at 6 MPa and 450°C and is condensed in the condenser at 20 kPa. Steam is extracted from the turbine at 0.4 MPa to heat the feedwater in an open feedwater heater. Water leaves the feedwater heater as a saturated liquid. Show the cycle on a T-s diagram, and determine (a) the net work output per kilogram of steam flowing through the boiler and (b) the thermal efficiency of the cycle.
10–51 Repeat Prob. 10–50 by replacing the open feedwater heater with a closed feedwater heater. Assume that the feedwater leaves the heater at the condensation temperature of the extracted steam and that the extracted steam leaves the heater as a saturated liquid and is pumped to the line carrying the feedwater.
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Consider a 150-MW steam power plant that operates on a simple Rankine cycle. Steam enters the turbine at 7 MPa and 500°C and is cooled in the condenser at 10 kPa. Calculate the volume flow rate of sea water (S.G. = 1.05) used in the condenser, if the allowable temperature rise is 5°C. Assume an isentropic efficiency of 87% for both the turbine and the pump.
A steam power plant operates on an ideal regenerative Rankine cycle. Steam enters
the turbine at 6 MPa and 450°C and is condensed in the condenser at 20 kPa. Steam
is extracted from the turbine at 0.4 MPa to heat the feed-water in an open feed-
water heater. Water leaves the feed-water heater as a saturated liquid. Show the
cycle on a T-s diagram, and determine (a) the net work output per kilogram of
steam flowing through the boiler and, (b) the thermal efficiency of the cycle.
Chapter 10 Solutions
Thermodynamics: An Engineering Approach
Ch. 10.9 - Why is the Carnot cycle not a realistic model for...Ch. 10.9 - Prob. 2PCh. 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...
Ch. 10.9 - Is it possible to maintain a pressure of 10 kPa in...Ch. 10.9 - 10–12 A steam power plant operates on a simple...Ch. 10.9 - 10–13 Refrigerant-134a is used as the working...Ch. 10.9 - 10–14 A simple ideal Rankine cycle which uses...Ch. 10.9 - 10–15E A simple ideal Rankine cycle with water as...Ch. 10.9 - Consider a 210-MW steam power plant that operates...Ch. 10.9 - Consider a 210-MW steam power plant that operates...Ch. 10.9 - A steam Rankine cycle operates between the...Ch. 10.9 - A steam Rankine cycle operates between the...Ch. 10.9 - Prob. 20PCh. 10.9 - Prob. 21PCh. 10.9 - A simple Rankine cycle uses water as the working...Ch. 10.9 - The net work output and the thermal efficiency for...Ch. 10.9 - A binary geothermal power plant uses geothermal...Ch. 10.9 - Consider a coal-fired steam power plant that...Ch. 10.9 - Show the ideal Rankine cycle with three stages of...Ch. 10.9 - How do the following quantities change when a...Ch. 10.9 - Consider a simple ideal Rankine cycle and an ideal...Ch. 10.9 - An ideal reheat Rankine cycle with water as the...Ch. 10.9 - 10–31 A steam power plant operates on the ideal...Ch. 10.9 - Steam enters the high-pressure turbine of a steam...Ch. 10.9 - 10–34 Consider a steam power plant that operates...Ch. 10.9 - A steam power plant operates on an ideal reheat...Ch. 10.9 - Consider a steam power plant that operates on a...Ch. 10.9 - Repeat Prob. 1041 assuming both the pump and the...Ch. 10.9 - Prob. 39PCh. 10.9 - How do open feedwater heaters differ from closed...Ch. 10.9 - How do the following quantities change when the...Ch. 10.9 - Prob. 43PCh. 10.9 - 10–44 The closed feedwater heater of a...Ch. 10.9 - A steam power plant operates on an ideal...Ch. 10.9 - A steam power plant operates on an ideal...Ch. 10.9 - 10–47 A steam power plant operates on an ideal...Ch. 10.9 - Consider a steam power plant that operates on the...Ch. 10.9 - Consider a steam power plant that operates on the...Ch. 10.9 - Consider a steam power plant that operates on the...Ch. 10.9 - Consider an ideal steam regenerative Rankine cycle...Ch. 10.9 - A steam power plant operates on an ideal...Ch. 10.9 - Repeat Prob. 1060, but replace the open feedwater...Ch. 10.9 - 10–57 An ideal Rankine steam cycle modified with...Ch. 10.9 - Prob. 58PCh. 10.9 - Prob. 59PCh. 10.9 - Prob. 60PCh. 10.9 - Consider a steam power plant that operates on a...Ch. 10.9 - Prob. 63PCh. 10.9 - Prob. 64PCh. 10.9 - The schematic of a single-flash geothermal power...Ch. 10.9 - Prob. 66PCh. 10.9 - Prob. 67PCh. 10.9 - Consider a cogeneration plant for which the...Ch. 10.9 - Prob. 69PCh. 10.9 - A large food-processing plant requires 1.5 lbm/s...Ch. 10.9 - Steam is generated in the boiler of a cogeneration...Ch. 10.9 - Consider a cogeneration power plant modified with...Ch. 10.9 - Steam is generated in the boiler of a cogeneration...Ch. 10.9 - Prob. 75PCh. 10.9 - Why is the combined gassteam cycle more efficient...Ch. 10.9 - The gas-turbine portion of a combined gassteam...Ch. 10.9 - Prob. 78PCh. 10.9 - Prob. 80PCh. 10.9 - Consider a combined gassteam power plant that has...Ch. 10.9 - Why is steam not an ideal working fluid for vapor...Ch. 10.9 - Prob. 86PCh. 10.9 - What is the difference between the binary vapor...Ch. 10.9 - Why is mercury a suitable working fluid for the...Ch. 10.9 - By writing an energy balance on the heat exchanger...Ch. 10.9 - Steam enters the turbine of a steam power plant...Ch. 10.9 - Prob. 91RPCh. 10.9 - A steam power plant operates on an ideal Rankine...Ch. 10.9 - Consider a steam power plant operating on the...Ch. 10.9 - Consider a steam power plant that operates on a...Ch. 10.9 - Repeat Prob. 1098 assuming both the pump and the...Ch. 10.9 - Consider an ideal reheatregenerative Rankine cycle...Ch. 10.9 - Prob. 97RPCh. 10.9 - Prob. 98RPCh. 10.9 - A textile plant requires 4 kg/s of saturated steam...Ch. 10.9 - Consider a cogeneration power plant that is...Ch. 10.9 - Prob. 101RPCh. 10.9 - Reconsider Prob. 10105E. It has been suggested...Ch. 10.9 - Reconsider Prob. 10106E. During winter, the system...Ch. 10.9 - Prob. 104RPCh. 10.9 - Prob. 105RPCh. 10.9 - Prob. 106RPCh. 10.9 - A steam power plant operates on an ideal...Ch. 10.9 - Show that the thermal efficiency of a combined...Ch. 10.9 - Prob. 113RPCh. 10.9 - Starting with Eq. 1020, show that the exergy...Ch. 10.9 - A solar collector system delivers heat to a power...Ch. 10.9 - Consider a simple ideal Rankine cycle. If the...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 - Prob. 120FEPCh. 10.9 - A simple ideal Rankine cycle operates between the...Ch. 10.9 - Prob. 122FEPCh. 10.9 - Prob. 123FEPCh. 10.9 - Consider a combined gas-steam power plant. Water...Ch. 10.9 - Pressurized feedwater in a steam power plant is to...Ch. 10.9 - Consider a steam power plant that operates on the...
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