Chapter 6, Problem 6.102P

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.

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.

The entropy change between two specified states is the same whether the process is reversible or irreversible.

Air is compressed adiabatically in a piston-cylinder assembly from 1 bar, 300 K to 6 bar, 600 K. The air can be modeled as an ideal gas and kinetic and potential energy effects are negligible. Determine the amount of entropy produced, in kJ/K per kg of air, for the compression. What is the minimum theoretical work input, in kJ per kg of air, for an adiabatic compression from the given initial state to a final pressure of 6 bar? Note that work is positive into the compressor. Part A Determine the amount of entropy produced, in kJ/K per kg of air, for the compression. o/m = i kJ/K

Water contained in a closed, rigid tank, initially at 100 lbf/in2, 800oF, is cooled to a final state where the pressure is 25 lbf/in2.Determine the quality at the final state and the change in specific entropy, in Btu/lb·oR, for the process.

A steam turbine operates with an inlet condition of 30 bar, 400 0C, 160 m/s and an outlet state of a saturated vapour at 0.7 bar with a velocity of 100 m/s. The mass flow rate is 1200 kg/min and the power output is 10800 kW. present process is on T-V diagram. Determine the magnitude and direction of the heat transfer rate in kJ/min if the potential energy change is negligible.

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.

Refrigerant 134a at p₁ = 30 lb/in², T1₁ = 40°F enters a compressor operating at steady state with a mass flow rate of 325 lb/h and exits as saturated vapor at p2 = 160 lbf/in². Heat transfer occurs from the compressor to its surroundings, which are at To = 40°F. Changes in kinetic and potential energy can be ignored. The power input to the compressor is 3.25 hp. Determine the heat transfer rate for the compressor, in Btu/hr, and the entropy production rate for the compressor, in Btu/hr.°R.

Refrigerant 134a at p1 = 30 lbf/in2, T1 = 40oF enters a compressor operating at steady state with a mass flow rate of 350 lb/h and exits as saturated vapor at p2 = 160 lbf/in2. Heat transfer occurs from the compressor to its surroundings, which are at T0 = 40oF. Changes in kinetic and potential energy can be ignored. The power input to the compressor is 3.5 hp. Determine the heat transfer rate for the compressor, in Btu/hr, and the entropy production rate for the compressor, in Btu/hr·oR.