Q5/ Steam enters a turbine with a pressure of 30 bar, a temperature of 400 °C, and a velocity of 160 m/s. Saturated vapor at 100 °C exits with a velocity of 100 m/s. At steady state, the turbine develops work equal to 540 kJ per kg of steam flowing through the turbine. Heat transfer between the turbine and its surroundings occurs at an average outer surface temperature of 350 K. Determine the rate at which entropy is produced within the turbine per kg of steam flowing, in kJ/kg.K. Neglect the change in potential energy between inlet and exit. 30 bar 400°C Surroundings at 293 K P = 30 bar T, = 400°C V, = 160 m/s 1 Wey = 540 kJ/kg 100°CE >T, = 100°C Saturated vapor V2 = 100 m/s T = 350 K-

Q5/ Steam enters a turbine with a pressure of 30 bar, a temperature of 400 °C, and a velocity of 160 m/s. Saturated vapor at 100 °C exits with a velocity of 100 m/s. At steady state, the turbine develops work equal to 540 kJ per kg of steam flowing through the turbine. Heat transfer between the turbine and its surroundings occurs at an average outer surface temperature of 350 K. Determine the rate at which entropy is produced within the turbine per kg of steam flowing, in kJ/kg.K. Neglect the change in potential energy between inlet and exit. 30 bar 400°C Surroundings at 293 K P = 30 bar T, = 400°C V, = 160 m/s 1 Wey = 540 kJ/kg 100°CE >T, = 100°C Saturated vapor V2 = 100 m/s T = 350 K-

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Air (Rair = 0.287 ) as an ideal gas flows through the turbine and heat exchanger arrangement kg-K, shown below. Steady-state data are given on the figure. Stray heat transfer and kinetic and potential energy effects can be ignored. Sketch a T - s diagram of processes 1-4 and determine: (a) The entropy production of turbine 1 [3.2 kW /K] (b) The isentropic efficiency of turbine 1 [75%] (c) The exit temperature of turbine 2 if its isentropic efficiency is nr, = 0.85 [960 K] (d) The entropy production within the intermediate heat exchanger [3.2 kW/K] W1 = 10,000 kW Wn= ? Turbine Turbine P3= 4.5 bar T3 = ? T = 1100 K P2=5 bar P4 = 1 bar Air wwww www 2 4 T = 1400 K Pi = 20 bar Ts = 1480 K 5 Ps = 1.35 bar ms = 1200 kg/min Heat exchanger V T = 1200 K P6 =1 bar %3D Air in
A constant air flow at 1500 kPa and 500 ° C enters the system shown opposite in point 1 and is divided into two flows. One flow with a mass flow of 3 kg /s enters a reversible adiabatic turbine, while the second flow passes through a valve with a mass flow of 2 kg / s. The pressure at point 4 is 100 kPa. (a) Determine the power of the turbine in kW. (b) Determine the state at the outlet of the valve. (c) Determine the state at point 4. 3 4 1 2
Carbon dioxide gas is compressed at steady state from a pressure of 18 lbf/in2 and a temperature of 32°F to a pressure of 50 lbf/in2 and a temperature of 130°F. The gas enters the compressor with a velocity of 30 ft/s and exits with a velocity of 80 ft/s. The mass flow rate is 2500 Ib/hr. The magnitude of the heat transfer rate from the compressor to its surroundings is 5% of the compressor power input. Use the ideal gas model with c, = 0.21 Btu/lb-°R and neglect potential energy effects. Determine the flow area at the inlet, in ft2, and the power required by the compressor to work, in horsepower.
Carbon dioxide gas is compressed at steady state from a pressure of 22 lbf/in2 and a temperature of 32°F to a pressure of 50 lbf/in2 and a temperature of 110°F. The gas enters the compressor with a velocity of 30 ft/s and exits with a velocity of 80 ft/s. The mass flow rate is 4000 lb/hr. The magnitude of the heat transfer rate from the compressor to its surroundings is 5% of the compressor power input. Use the ideal gas model with cp = 0.21 Btu/lb·oR and neglect potential energy effects.Determine the flow area at the inlet, in ft2, and the power required by the compressor to work, in horsepower.
A reversible power cycle whose thermal efficiency is 37% receives 50 kJ by heat transfer from a hot reservoir at 300°C and rejects energy by heat transfer to a cold reservoir at temperature Tc. Determine the energy rejected, in KJ, and Tc, in °C. Determine the entropy production for the cycle, Ocycle, in kJ/K.
Carbon dioxide gas is compressed at a steady state from a pressure of 16 lbf/in2 and a temperature of 32oF to a pressure of 50 lbf/in2 and a temperature of 130oF. The gas enters the compressor with a velocity of 30 ft/s and exits with a velocity of 80 ft/s. The mass flow rate is 3500 lb/hr. The magnitude of the heat transfer rate from the compressor to its surroundings is 5% of the compressor power input. Use the ideal gas model with cp = 0.21 Btu/lb·oR and neglect potential energy effects. A.) Determine the flow area at the inlet, in ft2, B.) and the power required by the compressor to work, in horsepower. Show complete solutions.
Water vapor with a pressure of 160 bar and a temperature of 480°C enters a stable turbine with a volumetric flow of 800 m3/min. About 18% of the incoming mass flow exits a part of the turbine at a pressure of 5 bar, a temperature of 240°C and a velocity of 25 m/s. The rest comes out from another part of the turbine with a pressure of 0.06 bar, a quality of 94% and a speed of 400 m/s. Determine the diameters of each outlet channel in m.
Carbon dioxide gas is compressed at steady state from a pressure of 18 lb-/in² and a temperature of 32°F to a pressure of 50 lb-/in² and a temperature of 110°F. The gas enters the compressor with a velocity of 30 ft/s and exits with a velocity of 80 ft/s. The mass flow rate is 4000 lb/hr. The magnitude of the heat transfer rate from the compressor to its surroundings is 5% of the compressor power input. Use the ideal gas model with cp = 0.21 Btu/lb.ºR and neglect potential energy effects. Determine the flow area at the inlet, in ft², and the power required by the compressor to work, in horsepower. Step 1 Determine the flow area at the inlet, in ft². A₁ = i ft²
A reversible power cycle whose thermal efficiency is 43% receives 50 kJ by heat transfer from a hot reservoir at 310°C and rejects energy by heat transfer to a cold reservoir at temperature Tc. Determine the energy rejected, in kJ, and Tc, in °C. Determine the entropy production for the cycle, cycle, in kJ/K.