A piston-cylinder assembly contains 2 kg of air modeled as an ideal gas with a constant specific heat ratio, k = 1.4. R for air is 0.287 kJ/kg*K. The air undergoes a power cycle consisting of four processes in series: Process 1-2: Isothermal expansion at 600 K from pi = 1 MPa to p2 = 0.7 MPa. Process 2-3: Polytropic expansion (n = k) to p3 = 0.5 MPa. Process 3-4: Constant pressure compression to V4 = V1. Process 4-1: Constant volume heating to pi = 1 MPa Part a.) Draw the p-v diagram and label all pressures and volumes with units. Part b.) Fill in as much of the charts below as you can. Process Q (net) kJ W (net) kJ AU kJ 1-2 2-3 3-4 4-1 Cycle (Total) State T (K) P (kPa) V(m') U(k) 2 3. Part c.) Determine the thermal efficiency for the cycle.

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
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A piston-cylinder assembly contains 2 kg of air modeled as an ideal gas with a constant
specific heat ratio, k = 1.4. R for air is 0.287 kJ/kg*K. The air undergoes a power cycle
consisting of four processes in series:
Process 1-2: Isothermal expansion at 600 K from p1 = 1 MPa to p2 = 0.7 MPa.
Process 2-3: Polytropic expansion (n = k) to p3 = 0.5 MPa.
Process 3-4: Constant pressure compression to V4 = V1.
Process 4-1: Constant volume heating to pi = 1 MPa
Part a.) Draw the p-v diagram and label all pressures and volumes with units.
Part b.) Fill in as much of the charts below as you can.
Process
Q (net) kJ
W (net) kJ
AU kJ
1-2
2-3
3-4
4-1
Cycle (Total)
T (K)
P (kPa)
V(m')
State
U(kJ)
4
Part c.) Determine the thermal efficiency for the cycle.
Transcribed Image Text:A piston-cylinder assembly contains 2 kg of air modeled as an ideal gas with a constant specific heat ratio, k = 1.4. R for air is 0.287 kJ/kg*K. The air undergoes a power cycle consisting of four processes in series: Process 1-2: Isothermal expansion at 600 K from p1 = 1 MPa to p2 = 0.7 MPa. Process 2-3: Polytropic expansion (n = k) to p3 = 0.5 MPa. Process 3-4: Constant pressure compression to V4 = V1. Process 4-1: Constant volume heating to pi = 1 MPa Part a.) Draw the p-v diagram and label all pressures and volumes with units. Part b.) Fill in as much of the charts below as you can. Process Q (net) kJ W (net) kJ AU kJ 1-2 2-3 3-4 4-1 Cycle (Total) T (K) P (kPa) V(m') State U(kJ) 4 Part c.) Determine the thermal efficiency for the cycle.
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