A closed loop steam cycle has been proposed to generate work from burning fuel. Heat enters at the boiler and leaves through the condenser only. Work is produced at the turbine, with only some of this being used to power the pump.
A closed loop steam cycle has been proposed to generate work from burning fuel. Heat enters at the boiler and leaves through the condenser only. Work is produced at the turbine, with only some of this being used to power the pump.
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
Problem 1.1P
Related questions
Question
![A closed loop steam cycle has been proposed to generate work from burning fuel. Heat enters at the
boiler and leaves through the condenser only. Work is produced at the turbine, with only some of
this being used to power the pump.
Pump
3
From 12: Entropy is constant
From 23: Pressure is constant
From 34: Entropy is constant
From 41: Pressure is constant
Boiler
W
Condenser
a) What is the enthalpy at point 1?
b) What is the enthalpy at point 2?
(2
The temperature of the fuel to the burner is 1100°C, and cooling water is available at 15°C. The
steam leaving the boiler is at 20 bar and 700°C, and the condenser produces a saturated liquid at 0.2
bar. The steam lines are well insulated, the turbine and pump operate reversibly and adiabatically.
Turbine
c) What is the enthalpy at point 3?
d) What is the enthalpy at point 4?
e) What is the nett work obtained in the cycle per kilogram of steam generated in the boiler?
(Give the positive value for your answer)
f)
How much heat is discarded in the condenser per kilogram of steam generated in the boiler?
g) What fraction of the work generated by the turbine is used to operate the pump?
h) How much heat is absorbed in the boiler per kilogram of seam generated?
i) What is the coefficient of performance for this system to the nearest 25% ? [Negative
marking 0.5 for incorrect answers].
2](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2d6d90ff-3488-4045-9f18-920efa89fd99%2Fcff68f3c-ed05-42ad-8e57-5d8a01a077b0%2Fetofhqk_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A closed loop steam cycle has been proposed to generate work from burning fuel. Heat enters at the
boiler and leaves through the condenser only. Work is produced at the turbine, with only some of
this being used to power the pump.
Pump
3
From 12: Entropy is constant
From 23: Pressure is constant
From 34: Entropy is constant
From 41: Pressure is constant
Boiler
W
Condenser
a) What is the enthalpy at point 1?
b) What is the enthalpy at point 2?
(2
The temperature of the fuel to the burner is 1100°C, and cooling water is available at 15°C. The
steam leaving the boiler is at 20 bar and 700°C, and the condenser produces a saturated liquid at 0.2
bar. The steam lines are well insulated, the turbine and pump operate reversibly and adiabatically.
Turbine
c) What is the enthalpy at point 3?
d) What is the enthalpy at point 4?
e) What is the nett work obtained in the cycle per kilogram of steam generated in the boiler?
(Give the positive value for your answer)
f)
How much heat is discarded in the condenser per kilogram of steam generated in the boiler?
g) What fraction of the work generated by the turbine is used to operate the pump?
h) How much heat is absorbed in the boiler per kilogram of seam generated?
i) What is the coefficient of performance for this system to the nearest 25% ? [Negative
marking 0.5 for incorrect answers].
2
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Step 1: Enthalpy at point 1 ( Exit from the boiler/Inlet to the isentropic turbine)
VIEWStep 2: (b) and (c) Enthalpy at point 2 and 3
VIEWStep 3: (d) Enthalpy at point 4 ( Exit from the isentropic pump /Inlet to the boiler)
VIEWStep 4: (e) Net cycle work
VIEWStep 5: (f) Heat discarded in the condenser
VIEWStep 6: (g) Fraction of the turbine work used to drive the pump
VIEWStep 7: (h) Heat absorbed in the boiler
VIEWStep 8: (i) Performance of the system
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