air contained in a piston-cylinder device undergoes a cycle comprised of the following four internally reversible processes. process 1 to 2: constant temperature (T2=T1) from P1 = 1 bar and T1 = 300 K to P2 = 10 bar during which heat transfer occurs from the air
process 2 to 3 : Constant [ressure (P2 = P3) to T3 = 1500K durin which heat transfer occurs the air
Process 3 to 4 : constant temperature (T3 = T4) during which heat transfer occurs to the air
Process 4 to 1 : constant pressure (P4 = P1) during which heat transfer occurs from the air
The heat transfer from the air during the process from state 4 to 1 is used for the
heat transfer to the air during the process from 2 to 3. The two heat transters are
equal in magnitude and are internal to the system i.e. they do not interact with the
external environment.
(a) Show the cycle on P-v and T-s diagrams with relevant lines of constant
pressure and temperature. Label the axes and four states and indicate the process
directions with arTOWs.
(b) Calculate the specific heat transfer (kJ/kg) for process from state 1 to 2 and for
process from state 3 to 4
(c) Determine the thermal efficiency (%)of the cycle.
Molecular weight of air: 28.97 kg/kmol
Jdentify the system, show mass/energy interactions (EFD), list any assumptions
and basic equations, and provide your solution. There is no need to re-write the
given and find
