Q1 (a) A frictionless piston-cylinder device contains water and the water is heated in a constant pressure process by an electrical heater. The water is also heated by an external heat source as shown in Figure Qla. Water Electrical Heat heater Figure Qla i) Write the equation for boundary work for the above process. ii) Will the boundary work in this process be positive, negative or zero? Explain your answer. iii) If no heat is supplied to the system, and the electrical heater is turned off, will the volume increase, decrease or remain the same when thermal equilibrium is achieved? Explain your answer.

Q1 (a) A frictionless piston-cylinder device contains water and the water is heated in a constant pressure process by an electrical heater. The water is also heated by an external heat source as shown in Figure Qla. Water Electrical Heat heater Figure Qla i) Write the equation for boundary work for the above process. ii) Will the boundary work in this process be positive, negative or zero? Explain your answer. iii) If no heat is supplied to the system, and the electrical heater is turned off, will the volume increase, decrease or remain the same when thermal equilibrium is achieved? Explain your answer.

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

Q1 (a)
A frictionless piston-cylinder device contains water and the water is heated in a constant
pressure process by an electrical heater. The water is also heated by an external heat source as
shown in Figure Q1a.
Water
Electrical
Heat
heater
Figure Qla
i) Write the equation for boundary work for the above process.
ii) Will the boundary work in this process be positive, negative or zero? Explain your
answer.
iii) If no heat is supplied to the system, and the electrical heater is turned off, will the
volume increase, decrease or remain the same when thermal equilibrium is achieved?
Explain your answer.

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