A piston-cylinder device contains 3.2 kg of air initially at 300 kPa and 227 °C (State 1). The air is now expanded slowly in polytropic process during which PV¹.2=constant (n=1.2) until the volume is doubled (State 2). Then the air expanded at constant pressure until the volume reached three times the volume of State 1 (State 3). Air properties: R = 287 J/kg.K, Cv = 718 J/kg.K, and Cp = 1005 J/kg.K a) Calculate the total work done and the heat transfer in kJ. b) Draw the two processes on p-v diagram.

A piston-cylinder device contains 3.2 kg of air initially at 300 kPa and 227 °C (State 1). The air is now expanded slowly in polytropic process during which PV¹.2=constant (n=1.2) until the volume is doubled (State 2). Then the air expanded at constant pressure until the volume reached three times the volume of State 1 (State 3). Air properties: R = 287 J/kg.K, Cv = 718 J/kg.K, and Cp = 1005 J/kg.K a) Calculate the total work done and the heat transfer in kJ. b) Draw the two processes on p-v diagram.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Basic Thermodynamic Processes

The word 'thermodynamics' can be divided into two words, 'thermo' and 'dynamics'. The word thermo deals with the heat and thermal phenomenon, whereas dynamics deals with forces or external agent that drives the heat flow or aids in the motion of heat.

Question

A piston-cylinder device contains 3.2 kg of air initially at 300 kPa and 227
°C (State 1). The air is now expanded slowly in polytropic process during
which PV1.2-constant (n=1.2) until the volume is doubled (State 2). Then
the air expanded at constant pressure until the volume reached three times
the volume of State 1 (State 3). Air properties: R = 287 J/kg.K, C₁ = 718
J/kg.K, and Cp = 1005 J/kg.K
a) Calculate the total work done and the heat transfer in kJ.
b) Draw the two processes on p-v diagram.

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