Consider the insulated piston-cylinder device shown in the figure below. The cylinder has a piston restrained by a spring and initially contains 0.8 m³ of air at 100 kPa and 25°C. Now, the air in the device is heated for 1 hour by a resistance heater placed inside the cylinder, causing the piston to rise. If the pressure varies linearly with volume until a final pressure of 300 kPa and a final volume of 1.2 m³ is reached, (a) determine the final temperature, (b) determine the power of the electrical resistance and (c) show the process path of air on P-v and T-v diagrams. Assume that the specific heats vary with temperature. Air ww

Consider the insulated piston-cylinder device shown in the figure below. The cylinder has a piston restrained by a spring and initially contains 0.8 m³ of air at 100 kPa and 25°C. Now, the air in the device is heated for 1 hour by a resistance heater placed inside the cylinder, causing the piston to rise. If the pressure varies linearly with volume until a final pressure of 300 kPa and a final volume of 1.2 m³ is reached, (a) determine the final temperature, (b) determine the power of the electrical resistance and (c) show the process path of air on P-v and T-v diagrams. Assume that the specific heats vary with temperature. Air ww

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

Consider the insulated piston-cylinder device shown in the figure below. The cylinder has a
piston restrained by a spring and initially contains 0.8 m³ of air at 100 kPa and 25°C. Now,
the air in the device is heated for 1 hour by a resistance heater placed inside the cylinder,
causing the piston to rise. If the pressure varies linearly with volume until a final pressure of
300 kPa and a final volume of 1.2 m³ is reached,
(a) determine the final temperature,
(b) determine the power of the electrical resistance and
(c) show the process path of air on P-v and T-v diagrams.
Assume that the specific heats vary with temperature.
Air

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