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A system consisting of 1 kg of H2O undergoes a power cycle

Fundamentals of Engineering Thermodynamics | 8th Edition | ISBN: 9781118412930 | Authors: Michael J. Moran ISBN: 9781118412930 139

Solution for problem 3.78 Chapter 3

Fundamentals of Engineering Thermodynamics | 8th Edition

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Fundamentals of Engineering Thermodynamics | 8th Edition | ISBN: 9781118412930 | Authors: Michael J. Moran

Fundamentals of Engineering Thermodynamics | 8th Edition

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Problem 3.78

A system consisting of 1 kg of H2O undergoes a power cycle composed of the following processes: Process 12: Constant-volume heating from p1 5 5 bar, T1 5 1608C to p2 5 10 bar. Process 23: Constant-pressure cooling to saturated vapor. Process 34: Constant-volume cooling to T4 5 1608C. Process 41: Isothermal expansion with Q41 5 815.8 kJ. Sketch the cycle on T and p diagrams. Neglecting kinetic and potential energy effects, determine the thermal efficiency.

Step-by-Step Solution:

Problem 3.78

A system consisting of 1 kg of H2O undergoes a power cycle composed of the following processes: Process 1-2: Constant-volume heating from  p = 5 bar, T1 = 160°C to p2  = 10 bar. Process 2-3: Constant-pressure cooling to saturated vapor. Process 3-4: Constant-volume cooling to T4 = 160°C. Process 4-1: Isothermal expansion with Q41 = 815.8 kJ. Sketch the cycle on T and p diagrams. Neglecting kinetic and potential energy effects, determine the thermal efficiency.

Step by step solution

Step 1 of 2

Using the given descriptions and data we can sketch the cycle. For process 1-2 we have a constant volume heating from  and  to . Process 2-3 is a constant pressure cooling to saturated vapour phase. Process 3-4 is a constant volume cooling to  and finally, process 4-1 is isothermal expansion back to the initial position.

Step 2 of 2

Chapter 3, Problem 3.78 is Solved
Textbook: Fundamentals of Engineering Thermodynamics
Edition: 8
Author: Michael J. Moran
ISBN: 9781118412930

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A system consisting of 1 kg of H2O undergoes a power cycle