Question

In: Mechanical Engineering

Thermodynamics Air at 3.5 MPa and 500°C is expanded in an adiabatic gas turbine to 0.2...

Thermodynamics

Air at 3.5 MPa and 500°C is expanded in an adiabatic gas turbine to 0.2 MPa. Assume that the process is reversible. Changes in KE and PE may be neglected and the average temperature of the gases is 550 K.

(a) Create a schematic representation of the equipment. (b) Represent the process on a T-s diagram. (c) Determine the polytropic exponent. (d) Determine the change in entropy for this expansion process

Solutions

Expert Solution


Related Solutions

Steam at 4 MPa and 350°C is expanded in an adiabatic turbine to 120 kPa. What...
Steam at 4 MPa and 350°C is expanded in an adiabatic turbine to 120 kPa. What is the isentropic efficiency of this turbine if the steam is exhausted as a saturated vapor?
Air is expanded isentropically in an adiabatic turbine, to produce 135 kW of power. If the...
Air is expanded isentropically in an adiabatic turbine, to produce 135 kW of power. If the mass flow rate is 0.75 kg/s, and the air at the exit is 500 K and 305 kPa, then what is the temperature and pressure at the inlet of the turbine? (a) The temperature is K. (b) The pressure is kPa. NOTE: Do NOT approximate the air as having a constant specific heat.
A steam turbine operates with steam at inlet conditions of 3.5 MPa and 3500 C. The...
A steam turbine operates with steam at inlet conditions of 3.5 MPa and 3500 C. The exit stream leave the turbine is at 0.8 MPa and is known to contain a mixture of saturated vapor and liquid. The steam rate through the turbine is 1000 kg/h. A (negligible) fraction of exit stream is bled through a throttle valve to 0.10 MPa and is found to be 1250 C. The measured output of the turbine is 100 kW. a) Determine the...
Steam enters an adiabatic turbine steadily at 3 MPa and 400°C and leaves at 50 kPa....
Steam enters an adiabatic turbine steadily at 3 MPa and 400°C and leaves at 50 kPa. If the isentropic efficiency of the turbine is 66.7%, determine the actual temperature of steam at turbine exit. The mass flow rate of the steam flowing through the turbine is 218 kg/min, determine the power output from the turbine. Plot the T-s diagram.
An adiabatic gas turbine uses air to produce work. Air expands adiabatically from 600 kPa and...
An adiabatic gas turbine uses air to produce work. Air expands adiabatically from 600 kPa and 287 C to 90 kPa and 67 C. Take specific heats at room temperature (300 K). a) Find the isentropic efficiency of the turbine. b) Find the work produced by the turbine for a mass flow rate of 2.5 kg/s. c) If the mass flow rate of air is again 2.5 kg/s, find the entropy generation under steady conditions
a steam turbine has an inlet flow of 3 kg/s water at 3.5 MPa and 450°C...
a steam turbine has an inlet flow of 3 kg/s water at 3.5 MPa and 450°C with a velocity of 140 m/s. The exit is at 800 KPa and 300°C and very low velocity. (a) How much heat (in MW) is assumed to be transferred into the turbine? (b) what is the work that goes into the turbine? (c) find the work produced by the turbine? (d) Find the entropy generation of the process. (e) find the carnot efficiency of...
A mass flow rate of 2 kg/s of steam is expanded in an adiabatic turbine with...
A mass flow rate of 2 kg/s of steam is expanded in an adiabatic turbine with an isentropic efficiency of 0.92. The steam enters at 3 MPa and 400 C and leaves at 30 kPa. Determine how much power the turbine is producing. Express your result in kW. (Sol: 1649 kW)
Steam flows steadily through an adiabatic turbine. The inlet conditions of the steam are 4 MPa,...
Steam flows steadily through an adiabatic turbine. The inlet conditions of the steam are 4 MPa, 500°C and 80 m/s, and the exit conditions are 30 kPa, 92% quality and 50 m/s. The mass flowrate of the steam is 12 kg/s. Investigate the effect of the turbine exit pressure on the power output of the turbine. Let the exit pressure vary from 10 to 200 kPa. Plot (1) T2 vs P2 and 2) Plot the power output (W_dot_T in MW)...
A steam turbine receives superheated steam at 18.0 kg/s, 500.°C, and 3.00 MPa and exhausts it...
A steam turbine receives superheated steam at 18.0 kg/s, 500.°C, and 3.00 MPa and exhausts it to 10 kPa with a quality of 96%. If the turbine is assumed to be internally reversible, determine the rate of heat loss from the turbine surface if the power output is 20.MW The surface temperature of the turbine is uniform at 350.°C, and the local environment (ground state) is taken to be saturated liquid water at T0 = 20.0°C. Neglect all flow stream...
Consider a gas turbine engine, fueled by natural gas, for generating electricity. A.) Calculate the adiabatic...
Consider a gas turbine engine, fueled by natural gas, for generating electricity. A.) Calculate the adiabatic flame temperature for this system, assuming we’ll use about 110% TA. B.) Estimate (calculate) the power output for this turbine, per lbm or kg of air. C.) If I’d like to provide the generator with 12,000 shp (shaft horsepower), what air mass flow do I need? D.) If this is an open cycle turbine, the exhaust gas has considerable remaining energy. How much heat...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT