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

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A gas turbine expands air adiabatically at 1000 kPa and 550 ⁰C to 120 kPa and...

A gas turbine expands air adiabatically at 1000 kPa and 550 ⁰C to 120 kPa and 130⁰C. Air enters the turbine through a 0.25 m 2 opening with an aveage velocity of 45 m/s, and exhausts through a 1 m2 opening. Assume the air is ideal gas with constant specific heats. Take the constant pressure specific heat and gas constant of air as Cp= 1.05 kJ/(kg K) and R=0.287 kJ/(kg K), respectively. Determine; (a) the mass flow rate of air...

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Air enters the turbine of a gas turbine at 1400 kPa, 1400 K, and expands to 100 kPa in two stages. Between the stages, the air is reheated at a constant pressure of 350 kPa to 1400 K. The expansion through each turbine stage is isentropic. Determine: (b) the heat transfer for the reheat process, in kJ/kg of air flowing. (c) the increase in net work as compared to a single stage of expansion with no reheat.

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.

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

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3.19 A gas with adiabatic exponent γ is compressed adiabatically from an initial state (Pi, Vi) to final state (Pf, Vf). (a) Show that the work done in this process is W=((ViPi)/y-1)*[(Vi/Vf)^(y-1) -1] (b) Evaluate the result numerically for one mole of helium gas initially at P = 1.0 atm and T = 300 K compressed to half its initial volume. (c) Compute the work done in an isothermal compression from the same initial point to half the initial volume....

Why does an ideal gas cool when it expands adiabatically and reversibly?

Air enters the compressor of a gas-turbine plant at ambient conditions of 100 kPa and 25°C...

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Steam at 4 MPa and 350°C is expanded in an adiabatic turbine to 120 kPa. What...

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A gas turbine receives 10 kg/s of helium and expands it polytropically (n = 1.8) from...

A gas turbine receives 10 kg/s of helium and expands it polytropically (n = 1.8) from 1100K and 600 kPa to 100 kPa. Determine the power produced, the entropy change of the helium through the gas turbine (kW/K) and the entropy change of the surroundings (kW/K). answer: 28,221 kW, 10.53 kW/K (Engineering thermodynamics)

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