In turbochargers a turbine is directly connected to a compressor. The power harvested by the turbine is used to power the compressor. In the figure below a turbine runs on steam and powers a compressor on air. Air can be considered a perfect gas with k = 1.34, R = 0.28 kJ/kgk and Cp 1.02 kJ/kgK. The air enters the compressor at p₁ 1bar, T₁ = 300K and a mass flow rate of mdot = 5.9 kg/s and exits at p2 = 5.2 bars. The steam enters the isentropic turbine at P3 = 2 MPa, T3 = 320°C and exits at p4 = 100 kPa. = State 2 Isentropic Compressor State 1 Air-perfect gas T₁ = 300K P₁ = 1 bar W tubine Answer: =? State 4 Isentropic Turbine State 3 Steam T, 320°C P3= 2MPa What is the enthalpy at state 3? Please enter your answer in kJ/kg

2. 2 kg of water in a piston-cylinder assembly undergoes two consecutive reversible processes: a. Process 1-2: Isentropic compression from P1 = 0.1 MPa, T1=100°C to P2=D0.5 MPa b. Process 2-3: Isobaric process to a temperature T3 = 400 C Determine heat transfer (kJ), work (kJ), and change in specific entropy (kJ/kgK) for each process.

Q.3 A steel bar at a temperature of 500°C is dropped into an insulated bath containing 20 kg water at 120°C. The temperature of water and Steel reaches steadily to 150°C. If specific heat for water is 4 .180 kJ/kg-K, calculate the change in entropy of system.