5. Gas Power Cycle in a Closed System with External Heat Exchange Air in a closed system undergoes the following reversible three-step cycle: 1-2 Isothermal compression of air at T1 = 27°C . The initial pressure is p1 = 2bar 2-3 Isochoric heating to T3 = 1200K . 3-1 Adiabatic reversible expansion to state 1. kJ Consider air as ideal gas with variable specific heats, and gas constant R = 0.287 kgK As you solve the problem, populate the table with the data you need. Use free columns as you like.

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I only need answers for d) and e). Data is filled out in second image. Thanks

5. Gas Power Cycle in a Closed System with External Heat Exchange
Air in a closed system undergoes the following reversible three-step cycle:
1-2 Isothermal compression of air at T1 = 27°C. The initial pressure is p1 = 2bar
2-3 Isochoric heating to T3 = 1200K .
%3D
3-1
Adiabatic reversible expansion to state 1.
Consider air as ideal gas with variable specific heats, and gas constant R
kJ
0.287
kgK'
As you solve the problem, populate the table with the data you need. Use free columns as you like.
State
T/
p/
v/
u/
h/
1
2
3
a) Draw the process curve in a p-v-diagram, and in a T-s-diagram.
b) Determine the volume V2 = V3
c) Determine work and heat per unit mass of air for each step.
d) Determine the thermal efficiency of the cycle.
e) The engine runs at 1800 rpm and delivers 12 kW of power. Determine the air mass in the engine
and the swept volume. The engine is externally heated, and does not exchange air with the
surroundings.
Transcribed Image Text:5. Gas Power Cycle in a Closed System with External Heat Exchange Air in a closed system undergoes the following reversible three-step cycle: 1-2 Isothermal compression of air at T1 = 27°C. The initial pressure is p1 = 2bar 2-3 Isochoric heating to T3 = 1200K . %3D 3-1 Adiabatic reversible expansion to state 1. Consider air as ideal gas with variable specific heats, and gas constant R kJ 0.287 kgK' As you solve the problem, populate the table with the data you need. Use free columns as you like. State T/ p/ v/ u/ h/ 1 2 3 a) Draw the process curve in a p-v-diagram, and in a T-s-diagram. b) Determine the volume V2 = V3 c) Determine work and heat per unit mass of air for each step. d) Determine the thermal efficiency of the cycle. e) The engine runs at 1800 rpm and delivers 12 kW of power. Determine the air mass in the engine and the swept volume. The engine is externally heated, and does not exchange air with the surroundings.
T/ (K)
p/ Gol
h/
u/K%,
State
1
300
0.4305
215.4
301.5
300
64
6-0134-5
215.4
301.48
3
1200
256
0-01345
861.6
1205. 92
Transcribed Image Text:T/ (K) p/ Gol h/ u/K%, State 1 300 0.4305 215.4 301.5 300 64 6-0134-5 215.4 301.48 3 1200 256 0-01345 861.6 1205. 92
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