A 60 MW turbine generator at 3600 rpm receives steam at 4.0 MPa and 450° C...
A 60 MW turbine generator at 3600 rpm receives steam at 4.0 MPa
and 450° C with a back pressure
of 10 kPa. Engine efficiency is 78% and the combined mechanical and
electrical efficiency is 95%.
What would be the exhaust enthalpy of the steam in kJ/kg?
Homework Answers
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A 60 MW turbine generator at 3600 rpm receives steam at 4.0 MPa
and 450° C...
In a reheat-cycle power plant, steam enters the high-pressure turbine at 5 MPa, 450°C, and expands...
In a reheat-cycle power plant, steam enters the high-pressure turbine at 5 MPa, 450°C, and expands to 0.5 MPa, after which it is reheated to 450°C. The steam is then expanded through the low-pressure turbine to 7.5 kPa. Liquid water (Vi 0.001 m/kg) leaves the condensor at 30°C, is pumped to 5 MPa, and returned to the steam generator. Each turbine is adiabatic, with an isentropic efficiency of 81.6 % and the pump efficiency is 848 %. If the total...
An insulated steam turbine receives 30 kg of steam per second at 3 MPa, 350 °C....
An insulated steam turbine receives 30 kg of steam per second at 3 MPa, 350 °C. At the point in the turbine where the pressure is 0.5 MPa, steam is bled off for processing equipment at the rate of 5 kg/s. The temperature of this steam is 200 °C. The balance of the steam leaves the turbine at 15 kPa, 90% quality. Determine the exergy per kilogram of the steam entering and at both points at which steam leaves the...
TURBO MACHINES SUBJECT QUESTION 10 A multi-stage high -pressure steam turbine is supplied with steam at a stagnation pressure of 7 MPa and a stagnation temperature of 500°C. The corresponding specifi...
TURBO MACHINES SUBJECT
QUESTION 10 A multi-stage high -pressure steam turbine is supplied with steam at a stagnation pressure of 7 MPa and a stagnation temperature of 500°C. The corresponding specific enthalpy is 3410kJ.kg. The steam exhaust from the turbine at a stagnation pressure of 0.7 MPa abs., the steam having been in a super-heated condition throughout the expansion. It can be assumed that the steam behaves like a perfect gas over the range of the expansion and that v...
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Consider now a turbine that operates with steam with T1 = 450◦C and P1= 8.0 MPa...
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2) A Rankine cycle generates steam at 5 MPa and 450°C leaving the boiler and the...
2) A Rankine cycle generates steam at 5 MPa and 450°C leaving the boiler and the turbine exhaust pressure is 7.5 kPa. The adiabatic efficiency of the turbine is 85%, and that of the pump is 70%. Determine (a) the net work in kW. (b) the thermal efficiency for the cycle, c) the change in availability of the steam as it passes through the boiler, and d) the irreversibility for the cycle. You may assume the environment is at 100...
1. (20 points) Consider a cogeneration system operating at steady state. Superheated steam enters the first...
1. (20 points) Consider a cogeneration system operating at steady state. Superheated steam enters the first turbine stage at 6 MPa, 540 °C. Between the first and second stages, 45% of the steam is extracted at 500 kPa and diverted to a process heating load of 5 x 108 kl/h. Condensate exits the process heat exchanger at 450 kPa with specific enthalpy of 589.13 kl/kg and is mixed with liquid exiting the lower pressure pump at 450 kPa. The entire...
1. (20 points) Consider a cogeneration system operating at steady state. Superheated steam enters the first...
1. (20 points) Consider a cogeneration system operating at steady state. Superheated steam enters the first turbine stage at 6 MPa, 540 °C. Between the first and second stages, 45% of the steam is extracted at 500 kPa and diverted to a process heating load of 5 x 108 kl/h. Condensate exits the process heat exchanger at 450 kPa with specific enthalpy of 589.13 kl/kg and is mixed with liquid exiting the lower pressure pump at 450 kPa. The entire...
Section B – combined cycles Overview: a combined gas – steam power cycle in Sweden provides...
Section B – combined cycles Overview: a combined gas – steam power cycle in Sweden provides electricity and hot water for heating duties for a small city. The gas turbine drives an electricity generator with an efficiency of 97%. A sub-critical coal fired boiler is used as a heat recovery steam generator, as well as providing additional steam from coal during the winter months. The steam turbine drives an electricity generator with an efficiency of 95%. The plant is located...
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In a reheat-cycle power plant, steam enters the high-pressure turbine at 5 MPa, 450°C, and expands to 0.5 MPa, after which it is reheated to 450°C. The steam is then expanded through the low-pressure turbine to 7.5 kPa. Liquid water (Vi 0.001 m/kg) leaves the condensor at 30°C, is pumped to 5 MPa, and returned to the steam generator. Each turbine is adiabatic, with an isentropic efficiency of 81.6 % and the pump efficiency is 848 %. If the total...
An insulated steam turbine receives 30 kg of steam per second at 3 MPa, 350 °C. At the point in the turbine where the pressure is 0.5 MPa, steam is bled off for processing equipment at the rate of 5 kg/s. The temperature of this steam is 200 °C. The balance of the steam leaves the turbine at 15 kPa, 90% quality. Determine the exergy per kilogram of the steam entering and at both points at which steam leaves the...
TURBO MACHINES SUBJECT
QUESTION 10 A multi-stage high -pressure steam turbine is supplied with steam at a stagnation pressure of 7 MPa and a stagnation temperature of 500°C. The corresponding specific enthalpy is 3410kJ.kg. The steam exhaust from the turbine at a stagnation pressure of 0.7 MPa abs., the steam having been in a super-heated condition throughout the expansion. It can be assumed that the steam behaves like a perfect gas over the range of the expansion and that v...
2) A Rankine cycle generates steam at 5 MPa and 450°C leaving the boiler and the turbine exhaust pressure is 7.5 kPa. The adiabatic efficiency of the turbine is 85%, and that of the pump is 70%. Determine (a) the net work in kW. (b) the thermal efficiency for the cycle, c) the change in availability of the steam as it passes through the boiler, and d) the irreversibility for the cycle. You may assume the environment is at 100...
1. (20 points) Consider a cogeneration system operating at steady state. Superheated steam enters the first turbine stage at 6 MPa, 540 °C. Between the first and second stages, 45% of the steam is extracted at 500 kPa and diverted to a process heating load of 5 x 108 kl/h. Condensate exits the process heat exchanger at 450 kPa with specific enthalpy of 589.13 kl/kg and is mixed with liquid exiting the lower pressure pump at 450 kPa. The entire...
1. (20 points) Consider a cogeneration system operating at steady state. Superheated steam enters the first turbine stage at 6 MPa, 540 °C. Between the first and second stages, 45% of the steam is extracted at 500 kPa and diverted to a process heating load of 5 x 108 kl/h. Condensate exits the process heat exchanger at 450 kPa with specific enthalpy of 589.13 kl/kg and is mixed with liquid exiting the lower pressure pump at 450 kPa. The entire...
1. (10 points) A combined gas turbine-vapor power plant has a net power output of 45 MW. Air enters the compressor of the gas turbine at 100 kPa, 300 K, and is compressed to 1200 kPa. The isentropic efficiency of the compressor is 84%. The condition at the inlet to the turbine is 1200 kPa, 1400 K. Air expands through the turbine, which has an isentropic efficiency of 88%, to a pressure of 100 kPa. The air then passes through...
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