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Analyze an example with respect to the power input and the air it can deliver to the engine and estimate its isentropic efficiency if enough data are found.
Study the turbine power output per unit initial mass, m1as a function of the pressure, P2.
Investigate the work input as a function of the pressure between the two stages, assuming the intercooler brings the air down to 50oC.
Also, find the time it will take to charge the system from startup and its continuous supply capacity.
In a turbine, what is the source of exergy? In a pump, what is the source of exergy? In a pump, what gains exergy?
How much entropy was generated in the throttling of the steam through the vent to 100 kPa when half of the original mass escaped?
Find the mass that escaped, the heat transfer, and the entropy generation, not including that made in the valve.
Assume the process is adiabatic and find the final mass, the final temperature, and the total entropy generation.
Find the two source mass flow rates and the total rate of entropy generation by this setup.
The inlet is at 200oC and the exit is at 40oC. Assume the heat transfer is to the ambient at 20oC and find the specific entropy generation.
Find the specific entropy generation in each of the two compressor stages. Find the flow rate of the water and the entropy generation in this intercooler.
Ammonia is brought from saturated vapor at 300 kPa to 1400 kPa. Find the compressor specific work, entropy generation, and its isentropic efficiency.
A gas turbine with air flowing in at 1200 kPa, 1200 K has an exit pressure of 200 kPa. Find the lowest possible exit temperature.
The heat exchanger is very long, so the two flows exit at the same temperature. Find the exit temperature by trial and error.
What is the turbine inlet pressure and the turbine power output? Find the compressor efficiency and the entropy generation for the process.
The inlet temperature is 1000 K and it exhausts to the atmosphere. Find the required inlet pressure and the exhaust temperature.
Calculate the heat transfer to the tank and show that this process does not violate the second law.
Find the final mass of water, the piston work from 1 to 2, the required compressor work, and the final pressure, P3.
The isentropic turbine efficiency is 70% and the inlet volumetric flow rate is 20 L/s. What is the turbine inlet pressure and the turbine power output?
A diffuser is a steady-state device in which a fluid flowing at high velocity is decelerated. What are the exit pressure and temperature of the air?
Determine the exit pressure and cross-sectional area of the nozzle if the mass flow rate is 0.15 kg/s and the expansion is reversible and adiabatic.
Steam enters a turbine at 3 MPa, 450oC and expands in a reversible adiabatic process. What is the mass flow rate of steam through the turbine?
To increase the work out of a turbine for given inlet and exit pressures, how should the inlet state be changed?
A supply line is supplied by an insulated compressor that takes in R-134a at 5oC. Calculate the total work input to the compressor to charge the tank.
If the process is adiabatic and reversible, find the final mass in the tank and the turbine work output.