Determine the back work ratio and the thermal efficiency of the cycle, assuming a regenerator with 79 percent effectiveness is used. The back work ratio is The thermal efficiency is[ %. 7%.
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- 6. In an air-standard Brayton cycle the air enters the compressor at 0.1 MPa and 15◦C. Thepressure leaving the compressor is 1.0 MPa, and the maximum temperature in the cycle is1100◦C. Determine:a. The pressure and temperature at each point in the cycle.b. The compressor work, turbine work, and cycle efficiency.The pressure ratio of a gas-turbine power plant operating on an ideal Brayton cycle is 8. The gas temperature is 300 degrees Fahrenheit at the compressor inlet and 1300 degrees Fahrenheit at the turbine inlet. Assuming an 80 percent compressor efficiency and an 80 percent turbine efficiency. A regenerator with an 80 percent efficiency is installed at the power plant. Determine the variation of particular heats with temperature using specific heats. a. The back work ratio b.The thermal efficiencyIn an ideal reheat cycle, the steam throttled condition is 8 MPa and 480 degree C. the steam is then reheated to MPa and 460 degree C. the turbine exhaust is 60 degree C. The required values of some state point properties are tabulated below. 2. Determine the quality of steam at the last stage of isentropic expansion in the turbine.
- In an ideal reheat cycle, the steam throttled condition is 8 MPa and 480 degree C. the steam is then reheated to MPa and 460 degree C. the turbine exhaust is 60 degree C. The required values of some state point properties are tabulated below. Determine the enthalpy of steam entering the reheater.Consider a simple Brayton cycle that uses air as the working fluid to operate a gas-turbine power plant between the pressure limits of 100kPa and 900kPa. Air enters the compressor at 298K and leaves at 610K at a mass flow rate of 1200kg/min. The maximum cycle temperature is 1380K. The net power output from the cycle is measured experimentally to be 55 MW. Assuming constant properties (Cv,Cp, R, and k) for air at 300K: a) Sketch a T-s diagram for the cycle b) Determine the isentropic efficiency of the turbine c) Determine the thermal efficiencyAir enters the compressor of a regenerative gas-turbine engine at 100 kPaand 300 K and is compressed to 800 kPa. The regenerator has aneffectiveness of 65 percent, and the air enters the turbine at 1200 K. For acompressor efficiency of 75 percent and a turbine efficiency of 86 percent,determine(a) The heat transfer in the regenerator.(b) The back work ratio.(c) The cycle thermal efficiency
- Answer All! Air enters the compressor of a gas turbine at 100 kPa and 300 K with a volume flow rate of 5 m3/s. The compressor pressure ratio is 10 and its isentropic efficiency is 85%. At the inlet to the turbine, the pressure is 950 kPa and the temperature is 1400 K. The turbine has an isentropic efficiency of 88% and the exit pressure is 100 kPa. On the basis of an air-standard analysis, what is the thermal efficiency of the cycle in percent?a. 42.06 c. 31.89b. b. 60.20 d. 25.15 in a gas turbine operating on the air-standard cycle, the air enters the compressor at 100 kPa and 30oC at the rate of 20 m3/s and is compressed to 500 kPa. The maximum temperature is 780oC and the exit pressure of the turbine is 100 kPa. Determine the net turbine power.a. 4853 kW c. 4483 kWb. 4358 kW d. 4538 kW A gas turbine working on air-standard Brayton cycle has air enter into the compressor at atmospheric condition and 22oC. The pressure ratio is 9 and the maximum temperature in…A turboprop aircraft propulsion engine operates where the air is at 8 psia and −10°F, on an aircraft flying at a speed of 600 ft/s. The Brayton cycle pressure ratio is 10, and the air temperature at the turbine inlet is 940°F. The propeller diameter is 10 ft and the mass flow rate through the propeller is 20 times that through the compressor. Determine the thrust force generated by this propulsion system. Assume ideal operation for all components and constant specific heats at room temperature.The mass flow rate of steam is 5 kg/s for a Rankine Cycle. For the actual cycle, the turbine efficiency is 86%, turbine brake efficiency is 80%, and generator efficiency=90%. The inlet conditions of the turbine are 3MPa and 400⁰C while the condensing pressure is 50kPa. a. Sketch the P-v, T-s and h-s diagram of the Cycle b. Calculate for the ideal and actual steam rates and heat rates of the Rankine Cycle and Rankine Engine, respectively. c. Determine the energy chargeable and combine thermal efficiencies for the Rankine Cycle and Rankine engine, respectively
- Question 15 15 It is proposed to use a Brayton cycle with an intercooler added to the compressor. Air enters the compressor at 100 kPa and 25 ˚C and eventually leaves the compressor at a pressure of 1500 kPa. The mass flow rate of the air is 50 kg/s. Consider the specific heats of the air to be constant. The isentropic efficiency of the compressor is 0.80. Determine the temperatures and the power required by the compressor if the compression occurs in one step,Determine the temperatures, pressures and the power required by the compressor if the air is compressed to 400 kPa, directed toward an intercooler where it is cooled to 25 ˚C, and thenreturned to the compressor then completes the compression t 1500 kPa.Sketch an appropriate T-s diagram and flow diagram of the system in 4.2.A power plant uses a gas turbine to produce electricity. Assume that the gas-turbine operates on the ideal Brayton cycle has a pressure ratio of 8. The outside air temperature is 27 C and without preheating, the air is drawn into the compressor. The air compressed in the compressor and its pressure and temperature increase. Thereafter it is supplied into the combustion chamber where its temperature increases to 1023 C at constant pressure. Thereafter, hot air is drawn into the turbine. By considering the air-standard assumptions, determine (a) the gas temperature at the exits of the compressor and the turbine (b) the back work ratio (c) the thermal efficiencyA power plant uses a gas turbine to produce electricity. Assume that the gas-turbine operates on the ideal Brayton cycle has a pressure ratio of 8. The outside air temperature is 27 °C and without preheating, the air is drawn into the compressor. The air compressed in the compressor and its pressure and temperature increase. Thereafter it is supplied into the combustion chamber where its temperature increases to 1023 °C at constant pressure. Thereafter, hot air is drawn into the turbine. By considering the air-standard assumptions, determine (a) the gas temperature at the exits of the compressor and the turbine (b) the back work ratio (c) the thermal efficiency