b) 68.92 kJ/kg, -48.44 kJ/kg

c) 20.48 kJ/kg

d) 29.7%

e) 0

please solve on paper with all steps thank you

Problem 1: Air undergoes the following reversible four step cycle: i) Isothermal expansion from state 1 at 400C and 500kPa to state 2 at 350kPa. ii) Adiabatic expansion to state 3, which is at a temperature of 200C. iii)Isothermal compression to state 4. iv) Adiabatic compression back to the initial conditions (400C and 500kPa). For air use: R=0.2871kJkg1K1,cp=1.007kJkg1K1,c=0.7197kJkg1K1,k=1.40 in all your calculations. a) Sketch and label both the Pv and Ts diagrams for this cyclic process. b) Estimate the specific heat transferred in the isothermal processes. c) What is the net work done by the system in this cycle? d) What is the thermal efficiency of the cycle? e) What is the total entropy change of the air during the cycle