5) A mass of 15 kg of air in a piston-cylinder device is heated from 25 to 85°C by passing current through a resistance heater inside the cylinder. The pressure inside the cylinder is held constant at 200 kPa during the process, and a heat loss of 70 kJ occurs. Determine the electric energy supplied, in kWh. (Hint: use the ideal gas model) W₂ Air P= constant

5) A mass of 15 kg of air in a piston-cylinder device is heated from 25 to 85°C by passing current through a resistance heater inside the cylinder. The pressure inside the cylinder is held constant at 200 kPa during the process, and a heat loss of 70 kJ occurs. Determine the electric energy supplied, in kWh. (Hint: use the ideal gas model) W₂ Air P= constant

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

5) A mass of 15 kg of air in a piston-cylinder device is heated from 25 to 85°C
by passing current through a resistance heater inside the cylinder. The pressure
inside the cylinder is held constant at 200 kPa during the process, and a heat
loss of 70 kJ occurs. Determine the electric energy supplied, in kWh. (Hint:
use the ideal gas model)
W₂
Air
P= constant

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Step 2: Calculation of internal energy of the air

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Step 3: Calculation of work done at constant pressure process

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Step 4: Calculation of the electric energy supplied

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