An insulated rigid tank contains air (an ideal gas) at 500 kPa and 500 K. A valve connected to the tank is now opened, and air can escape until the pressure inside the tank is dropped to 150 kPa. The air temperature during the process is maintained constant by an electric resistance heater placed in the tank. If the volume of the tank is 5 m3, determine the work input by the electric heater to air during this process, in kJ.

An insulated rigid tank contains air (an ideal gas) at 500 kPa and 500 K. A valve connected to the tank is now opened, and air can escape until the pressure inside the tank is dropped to 150 kPa. The air temperature during the process is maintained constant by an electric resistance heater placed in the tank. If the volume of the tank is 5 m3, determine the work input by the electric heater to air during this process, in kJ.

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

An insulated rigid tank contains air (an ideal gas) at 500 kPa and 500 K. A valve
connected to the tank is now opened, and air can escape until the pressure inside
the tank is dropped to 150 kPa. The air temperature during the process is
maintained constant by an electric resistance heater placed in the tank. If the
volume of the tank is 5 m³, determine the work input by the electric heater to air
during this process, in kJ.
O 1750
5030
2550

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