A spring-conditioned cylinder-piston device contains 0.25kg of air and operates under the following thermodynamic cycle: 1 -> 2: In state 1, P_1 = 200kPa and V_1 = 0.25m ^ 3. The compressed spring is released and the air is compressed, until the spring no longer stores energy and the piston simply rests on the stops: P_2 = 300kPa and V_2 = 0.10m ^ 3. 2 -> 3 After compression the heat is removed and the pressure drops to 100kPa in state 3. 3 -> 1: Heat is added, the spring is compressed, and the air expands to state 1. a) Make a diagram of the process and trajectories. b) Determine the air temperature in the 3 states. c) Calculate the work from state 1 to 2.
A spring-conditioned cylinder-piston device contains 0.25kg of air and operates under the following
1 -> 2: In state 1, P_1 = 200kPa and V_1 = 0.25m ^ 3. The compressed spring is released and the air is compressed, until the spring no longer stores energy and the piston simply rests on the stops: P_2 = 300kPa and V_2 = 0.10m ^ 3.
2 -> 3 After compression the heat is removed and the pressure drops to 100kPa in state 3.
3 -> 1: Heat is added, the spring is compressed, and the air expands to state 1.
a) Make a diagram of the process and trajectories.
b) Determine the air temperature in the 3 states.
c) Calculate the work from state 1 to 2.
d) Calculate the work from state 3 to 1.
e) Calculate the total work of the cycle and who performs it.
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