An adiabatic air compressor compresses 15 L/s of air at 1 bar and 30 °C to 8 bar and 350 °C. A heat loss of 10 KJ/Kg is estimated through the wall of the compressor. Determine the work required by the compressor in kJ/kg and the power required to drive the air compressor in kW.

Steam enters a turbine at T1=500 oC, P1= 10 MPa. The steam expands in the turbine to a pressure to P2=1 MPa, T2=200 °C. The turbine lost heat at a rate of 30 kW. If the mass flow rate of the steam was 5 kg/s, the power output of the turbine in kW is

There is a piston-cylinder system that undergoes a process. The total work done by the system, W, is 50 kJ, and thechange in the specific internal energy of the system, Δu, is −7 kJ/kg. We also know the total mass of the system, m, is 10kg. During the process, both the change of kinetic energy and the change of potential energy are negligible. Pleasedetermine 1) the total energy change, ΔE, in kJ; 2) the total heat transfer, Q, in kJ; and 3) judge the direction of energyflow for the heat transfer: into the system or out of the system.

Refrigerant 134a expands in a piston–cylinder assembly from p1 = 140 lbf/in2 and T1 = 140°F to p2 = 30 lbf/in2 and T2 = 80 oF.  The mass of refrigerant is 0.46 lb. During the process, the work done by the refrigerant is 4.32 Btu.  Kinetic and potential energy effects are negligible. Determine the initial volume of the refrigerant, V1, in ft3, and the heat transfer for the process, in Btu.

Steam at 1000 lbf/ft2 pressure and 300°R has specific volume of 6.5 ft3/lbm and a specific enthalpy of 9800 ft-lbf/lbm. Find the internal energy per pound mass of steam.

One kilogram of air is compressed from a volume of 1.0 m and a pressure of 100 kPa to a volume of 0.147 m and a pressure of 1000 kPa. Assuming that the compression follows the law pu" the work done during the compression process. = constant, find

Refrigerant 134a is contained in a piston-cylinder assembly, initially as a saturated vapor. The refrigerant is slowly heated until its temperature is 160 °C. During the process, the piston moves smoothly in the cylinder. For the refrigerant, evaluate the work, in kJ/kg.

Water at 210°C is heated, which increases the internal energy of the water by 1000 kJ/kg. Initially the quality of the system is 0.9. What is the final temperature, in °C, if the final pressure is 1.8 MPa? Report your answer to one decimal place.

A cylinder contains 0.113m3of air at 1 bar and 90°C .the air is compressed to a volume of 0.028 m3, the final pressure being 5.8bar .Determine 1- Mass of the air in the cylinder 2- Value of index (n) for the compression process 3- Increase in internal energy 4- Heat received or rejected by air during compression

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