Chapter 6, Problem 6.67P

Saturated water vapor at 300°F enters a compressor operating at steady state with a mass flow rate of 5 Ib/s and is compressed adiabatically to 650 lbf/in.? If the power input is 2150 hp, determine for the compressor: (a) the percent isentropic compressor efficiency and (b) the rate of entropy production, in hp/ R. Ignore kinetic and potential energy effects.

A mass of 3 kg of water contained in a piston–cylinder assembly expand from an initial state where T1 = 551°C, p1 = 700 kPa to a final state where T2 = 224°C, p2 = 300 kPa, with no significant effects of kinetic and potential energy. It is claimed that the water undergoes an adiabatic process between these states, while developing work. Evaluate entropy production in Joules/k.

Steam enters a turbine operating at a steady state at a pressure of 4 MPa, at temperature of 400 degrees Celcius, and a velocity of 200m/s . Saturated vapor exits at 100 degrees Celcius with a velocity of 100 m/s. Heat transfer from the turbine to its surroundings takes place at the rate of 20 kJ/kg of steam at a location where the average surface temperature is 350K. (a) Write the energy and entropy balance equations for a control volume the includes only the turbine and its contents (b) Determine the work produced, in kJ/kg of steam flowing. (c) For a control volume that includes only the turbine and its contents, calculate the rate of entropy production in kJ/kg*K (d) Assume the turbine described above is located in a factory where  the ambient temperature is 27 degrees Celcius. Determine the rate of entropy production in kj/kg*Kof steam, for an inlarged control volume that included the turbine and enough of its immediate surroundings so that heat transfer takes place from the…

Refrigerant 22 flows through a horizontal tube having an inside diameter of 4 cm. Therefrigerant flows at steady state and at the entrance to the tube it has with a quality of 0.3,temperature of 28°C, and velocity of 8 m/s. The refrigerant exits the tube as a saturatedliquid at 14 bar.Question:Determine:(a) the mass flow rate of the refrigerant, in kg/s.(b) the velocity of the refrigerant at the exit, in m/s.(c) the rate of heat transfer, in kW, and its associated direction with respect to therefrigerant

Refrigerant 134a enters an insulated diffuser as a saturated vapor at 80oF with a velocity of 1200 ft/s. The inlet area is 1.4 in2.  At the exit, the pressure is 400 lbf/in2 and the velocity is negligible. The diffuser operates at steady state and potential energy effects can be neglected. Determine the mass flow rate, in lb/s, and the exit temperature, in oF.

Water at p1 = 20 bar, T1 = 400oC enters a turbine operating at steady state and exits at p2 = 1.5 bar, T2 = 180oC.  The water mass flow rate is 4000 kg/hour. Stray heat transfer and kinetic and potential energy effects are negligible. Determine the power produced by the turbine, in kW, and the rate of entropy production in the turbine, in kW/K.

Entropy generation outside system boundaries can be accounted for by writing an entropy balance on an extended system that includes the system and its immediate surroundings.

Water at p1 = 20 bar, T1 = 400oC enters a turbine operating at steady state and exits at p2 = 1.5 bar, T2 = 200oC.  The water mass flow rate is 4000 kg/hour. Stray heat transfer and kinetic and potential energy effects are negligible.Determine the power produced by the turbine, in kW, and the rate of entropy production in the turbine, in kW/K.

Air at 200 kPa, 52°C, and a velocity of 355 m/s enters an insulated duct of varying cross-sectional area. The air exits at 100 kPa, 82°C. At the inlet, the cross-sectional area is 11.57 cm². Assuming the ideal gas model for the air, determine: (a) the exit velocity, in m/s. (b) the rate of entropy production within the duct, in kW/K. Part A Determine the exit velocity, in m/s. V2 = i m/s Save for Later Attempts: 0 of 1 used Submit Answer Part B The parts of this question must be completed in order. This part will be available when you complete the part above.