3.72 A piston-cylinder assembly contains 2 lb of water, initially at 100 lbf/in.² and 400°F. The water undergoes two processes in series: a constant-pressure process followed by a constant- volume process. At the end of the constant-volume process, the temperature is 300°F and the water is a two-phase liquid-vapor mixture with a quality of 60%. Neglect kinetic and potential energy effects. (a) Sketch Tv and p-v diagrams showing the key states and the processes. (b) Determine the work and heat transfer for each process, all in Btu.

3.72 A piston-cylinder assembly contains 2 lb of water, initially at 100 lbf/in.² and 400°F. The water undergoes two processes in series: a constant-pressure process followed by a constant- volume process. At the end of the constant-volume process, the temperature is 300°F and the water is a two-phase liquid-vapor mixture with a quality of 60%. Neglect kinetic and potential energy effects. (a) Sketch Tv and p-v diagrams showing the key states and the processes. (b) Determine the work and heat transfer for each process, all in Btu.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

**Problem 3.72**

A piston–cylinder assembly contains 2 lb of water, initially at 100 lbf/in² and 400°F. The water undergoes two processes in series: a constant-pressure process followed by a constant-volume process. At the end of the constant-volume process, the temperature is 300°F and the water is a two-phase liquid–vapor mixture with a quality of 60%. Neglect kinetic and potential energy effects.

(a) Sketch T–v and p–v diagrams showing the key states and the processes.

(b) Determine the work and heat transfer for each process, all in Btu.

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Given data is listed:

VIEW

Properties ar state (1):

VIEW

Properties ar state (3):

VIEW

Properties ar state (2):

VIEW

T-v and P-v plots:

VIEW

Work and heat transfer for Process (1)-(2):

VIEW

Work and heat transfer for Process (2)-(3):

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