8.6. A steam power plant employs two adiabatic turbines in series. Steam enters the first turbine at 650°C and 7000 kPa and discharges from the second turbine at 20 kPa. The system is designed for equal power outputs from the two turbines, based on a turbine efficiency of 78% for each turbine. Determine the temperature and pressure of the steam in its intermediate state between the two turbines. What is the overall efficiency of the two turbines together with respect to isentropic expansion of the steam from the initial to the final state?
8.6. A steam power plant employs two adiabatic turbines in series. Steam enters the first turbine at 650°C and 7000 kPa and discharges from the second turbine at 20 kPa. The system is designed for equal power outputs from the two turbines, based on a turbine efficiency of 78% for each turbine. Determine the temperature and pressure of the steam in its intermediate state between the two turbines. What is the overall efficiency of the two turbines together with respect to isentropic expansion of the steam from the initial to the final state?
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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Transcribed Image Text:8.6. A steam power plant employs two adiabatic turbines in series. Steam enters the first
turbine at 650°C and 7000 kPa and discharges from the second turbine at 20 kPa. The
system is designed for equal power outputs from the two turbines, based on a turbine
efficiency of 78% for each turbine. Determine the temperature and pressure of the
steam in its intermediate state between the two turbines. What is the overall efficiency
of the two turbines together with respect to isentropic expansion of the steam from the
initial to the final state?
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Step 1: Determine the given data
VIEWStep 2: Draw the diagram of the turbines
VIEWStep 3: Calculate the quality of the steam at the final state
VIEWStep 4: Calculate the enthalpy of the final state
VIEWStep 5: Calculate the enthalpy of the intermediate state
VIEWStep 6: Calculate the temperature and pressure of the intermediate state
VIEWStep 7: Calculate the overall efficiency
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