Chapter 6, Problem 6.57P

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Steam at 7 bar, dryness fraction 0.96, is throttled-down to 3.5 bar. Solve for the change of entropy per unit mass of steam and show the process on T-s diagram.

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Hot water at 400kPa, 150 deg Celsius is fed to a throttle at a rate of 1.5kg/s and exits at 200kPa. After leaving the throttle, the resulting mixture enters a chamber where the vapor leaves from the top at 200kPa and the liquid leaves from the bottom at 200kPa. What is the mass flow rate of each of the two exit flows?

You have an adiabatic steam turbine. The steam enters a 0.1m diameter pipe at 200 m/s and it at state conditions of 773K and specific volume of 0.0482 m?/kg. When it exits the turbine as a saturated mixture at 393K its specific volume is 0.665 m²/kg. Using the first law for control volumes, find the work output of the turbine. You can neglect the change in KE and PE.

A 130 L rigid tank initially contains nitrogen at 400 kPa, 100 K. Thetank is connected to a line which contains nitrogen at 10,000 kPa, 260 K.The valve is opened and nitrogen flows into the tank until half of thetank’s volume is filled with liquid nitrogen, at which point the valve isclosed. During the filling process heat is transferred from the tank tokeep the temperature constant at 100 K. Neglect KE and PE terms.Calculate the final pressure and quality, and the heat transferred inthe process.

An automobile wheel contains air with a pressure of 3x105 Pa at 25cc. The Sipop cover was removed and the air was adiabatically expanded against 105 Pa external pressure. What is the final temperature of the gas inside the wheel? (Note that the gas behaves ideally and the Cp value for the air should be taken into account as 7/2R)

(Q4) Two rigid tanks are connected by a valve. Tank A contains 0.2 m' of water at 400 kPa and 3 H,0 H,0 80 percent quality. Tank B contains 0.5 m of water at 200 kPa and 250°C. The valve is now 400kPa 200 kPa opened, and the two tanks eventually come to the o. same state. Determine the pressure and the amount of heat transfer when the system reaches thermal equilibrium with the surroundings at 25°C. B

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