Question
In: Mechanical Engineering
A gas turbine unit has a pressure ratio of 5/1 and a maximum cycle temperature of...
A gas turbine unit has a pressure ratio of 5/1 and a maximum cycle temperature of 550⁰C. The turbine drives the compressor and an electric generator., the mechanical efficiency of the drive being 97%. The ambient temperature is 20⁰C and the isentropic efficiencies of the compressor and turbine are 0.8 and 0.83 respectively.
Calculate the power output in kilowatts for an airflow of 15kg/s. Calculate also the thermal efficiency and the work ratio. Neglect changes in kinetic energy, and the loss of pressure in the combustion chamber.
Take cp = 1.005 kJ/kg K and ɣ=1.4 for the compression process, and take cp = 1.15 kJ/kg K and ɣ=1.333 for all combustion and expansion processes.
Solutions
samet mamat answered 1 year agoRelated Solutions
In a marine gas turbine unit a high-pressure turbine drives the compressor, and a low-pressure turbine...
In a marine gas turbine unit a high-pressure turbine drives the
compressor, and a low-pressure turbine drives the propeller through
suitable gearing. The overall pressure ratio is 4/1, and the
maximum temperature is 650⁰C. The isentropic efficiencies of the
compressor, High Pressure turbine, and Low Pressure turbine are
0.8, 0.83 and 0.85 respectively, and the mechanical efficiency of
both shafts is 98%.
Calculate the pressure entering the Low Pressure turbine when
the air intake conditions are 1.01 bar and 25⁰C....
A gas turbine power plant operates on a Brayton cycles has a pressure ratio of 7....
A gas turbine power plant operates on a Brayton cycles
has a pressure ratio of 7. Air enters the
compressor at 300 K. The energy in the form of heat is transferred
to the air in the amount of 950
kJ/kg. Using a variable specific heat for air and assuming the
compressor isentropic efficiency is
83 percent and turbine isentropic efficiency is 85 percent.
Determine the followings:
(i) The highest temperature in the cycle [5 marks]
(ii) The net work...
An industrial gas turbine operates at an 8.8:1 pressure ratio and a mass flow of 77...
An industrial gas turbine operates at an 8.8:1 pressure ratio
and a mass flow of 77 kg/s. The
exhaust temperature is at 437?C and the inlet temperature to the
machine is around 1000?C.
The machine is to be designed for a constant axial velocity of 200
m/s. (This data is based on
the Rolls-Royce Avon, an engine that dates from the 1950s but is
still used as low efficiency
high reliability engine for stationary power such as pipeline
pumping.)
For...
An industrial gas turbine operates at an 8.8:1 pressure ratio and a mass flow of 77...
An industrial gas turbine operates at an 8.8:1 pressure ratio
and a mass flow of 77 kg/s. The
exhaust temperature is at 437?C and the inlet temperature to the
machine is around 1000?C.
The machine is to be designed for a constant axial velocity of 200
m/s. (This data is based on
the Rolls-Royce Avon, an engine that dates from the 1950s but is
still used as low efficiency
high reliability engine for stationary power such as pipeline
pumping.)
For...
In a dual-combustion cycle, the maximum temperature is 2000 ?C and the maximum pressure is 70...
In a dual-combustion cycle, the maximum temperature is 2000 ?C
and the maximum pressure is 70 bar. Calculate the cycle efficiency
and the mean effective pressure when the pressure and temperature
at the start of compression are 1 bar and 17 ?C, respectively. The
compression ratio is 18/1.
ANSWERS(63.7%; 10.54 bar)
A gas turbine plant consists of a compressor with a pressure ratio of 10, a combustion...
A gas turbine plant consists of a compressor with a pressure
ratio of 10, a combustion chamber, and a turbine mounted on the
same shaft as the compressor; the net electrical power of the unit
is 20 MW. The inlet air conditions are 1.013 bar and 15 ?C and the
maximum cycle temperature is 1100 K. The exhaust gases from the
turbine are passed through a heat exchanger to heat water for space
heating before passing to the chimney; by...
A cold air-standard Otto cycle has a compression ratio of 6 and the temperature and pressure...
A cold air-standard Otto cycle has a compression ratio of 6 and
the temperature and pressure at the beginning of the compression
process are 520°R and 14.2 lbf/in.2, respectively. The heat
addition per unit mass of air is 500 Btu/lb. Assume constant
specific heats evaluted at 520°R. Determine:
(a) the maximum temperature, in °R.
(b) the maximum pressure, in lbf/in.2
(c) the percent thermal efficiency.
(d) the mean effective pressure, in lbf/in.2
A stationary power plant operates on Brayton cycle has a pressure ratio of 8. The gas...
A stationary power plant operates on Brayton cycle has
a pressure ratio of 8. The gas
temperature is 300 K at the compressor inlet and 1300 K at the
turbine inlet. Assuming
a compressor efficiency of 80 percent and a turbine efficiency of
85 percent, determine:
1) the gas temperature at the exits of the compressor
and the turbine,
2) the back work ratio,
3) the thermal efficiency of the cycle,
4) the thermal efficiency of the gas-turbine power plant...
A gas turbine air- standard cycle operates between a low pressure of 14.7 Psia and a...
A gas turbine air- standard cycle operates between a low
pressure of 14.7 Psia and a high pressure of 60 Psia. The
temperature of the gas at the inlet to the compressor and turbine
are 60 and 1000 respectively. If 40,000 ft3 /min. of air enter the
compressor and assuming k=1.41, compute:
a) The theoretical net power output, and
b) The air – standard thermal efficiency
The temperature and pressure of the steam at the inlet of a high pressure turbine is...
The temperature and pressure of the steam at the inlet of a high pressure turbine is 500 ° C, respectively. It is 12 MPa and 300 ° C and 3MPa at its outlet. If the mass flow of steam is 400 kg / h, how much is the isentropic efficiency of the turbine?
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- 4. Why did the United States and the Soviet Union find themselves in a “Cold War”...
- The Facts: Ann and Bill decided to start a coffee shop. They agreed Bill would provide...
- MARGI sells different types of wine. Customers place orders to the most popular “Summer Wine” at...
- A firm's bonds have a maturity of 8 years with a $1,000 face value, have an...
- Naive reasoning suggests that a string theory vacuum with cosmological constant Lambda1 is always unstable as...
- I. Design and code a class Rectangle that has the following properties: Two private members double...
- A bond has a $1,000 par value, 10 years to maturity, and an 8% annual coupon...
ADVERTISEMENT