27. Gas initially at a pressure of 101.325 kPa and temperature of 60 °C undergoes the following cycle. 1-2 Adiabatic compression through compression ratio of 4.5:1. 2-3 Heating at constant volume through a pressure ratio of 1.35:1. 3-4 Constant pressure expansion to initial pressure. 4-1 Constant pressure cooling to initial volume.

Elements Of Electromagnetics
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27. Gas initially at a pressure of 101.325 kPa and temperature of 60 °C undergoes the following cycle.
1-2 Adiabatic compression through compression ratio of 4.5:1.
2-3 Heating at constant volume through a pressure ratio of 1.35:1.
3-4 Constant pressure expansion to initial pressure.
4-1 Constant pressure cooling to initial volume.
If Cp = 1 kJ/kg-K and Cv = 0.678 kJ/kg-K for the gas, determine the thermal efficiency of the
cycle. Answer: A
A. 41.41%
B. 39.39%
C. 43.43%
D. 45.45%
Transcribed Image Text:27. Gas initially at a pressure of 101.325 kPa and temperature of 60 °C undergoes the following cycle. 1-2 Adiabatic compression through compression ratio of 4.5:1. 2-3 Heating at constant volume through a pressure ratio of 1.35:1. 3-4 Constant pressure expansion to initial pressure. 4-1 Constant pressure cooling to initial volume. If Cp = 1 kJ/kg-K and Cv = 0.678 kJ/kg-K for the gas, determine the thermal efficiency of the cycle. Answer: A A. 41.41% B. 39.39% C. 43.43% D. 45.45%
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