Chapter 7, Problem 7.49P

Practical examples 4. Air at a temperature of 75 °C and a pressure of 400 kPa occupies a volume of 0.14 m3 initially. If this air is compressed during a reversible and adiabatic process by a piston to a pressure of 7 bar 1. Calculate the final volume 2. Calculate the final temperature 3. Calculate the work done on the air. Is it gained or lost? . Take k = 1.4 4. Repeat the above if the air is expanded to 1 bar by a reversible and atmospheric process. I

8.7 Diffuser A jet flies at an altitude of 10 km, where the pressure is 0.32 bar, and the temperature is-44°C. The jet flies with a velocity of 880 km/h, and its diffuser has an inlet cross section of 1.5 m². Assume negligible diffuser exit velocity, adiabatic reversible flow, and consider air as ideal gas with constant specific R. Determine the mass flow into the engine, and the pressure increase heats, R = 0.287 = :, Cp R. across the diffuser. kJ kgk

12. Calculate the entropy of steam in kJ/kg-K at 476 kPa with quality of 0.6.

2. Air enters a reversible compressor steadily and it is compressed from an inlet temperature and pressure of 25 deg C and 100 kPa respectively Air leaves the compressor at 1000 kPa. Compute the compressor per unit mass for an isentropic compression. wwwm

Problem (4.3): 1 kg of air is allowed to expand reversibly in a cylinder behind a piston in such a way that the temperature remains constant at 260°C while the yolume is doubled The piston is then moved in and heat is rejected by the air reversibly at constant pressure until the volume is the same as it was initially. Calculate the net heat flow and the overall change of entropy. Sketch the processes on a (T-S) diagram.

#2 Air at 3.5 MPa and 500°C enters a gas turbine and exits at 200 kPa. If the process in the turbine is reversible and follows the polytropic process Pv3 = constant. (1) What is the air exit temperature? (2) What is the specific work output?

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Ten kmol per hour of air is throttled from upstream conditions at 25°C and 10 bar to adownstream pressure of 1.2 bar. Assume air to be an ideal gas with Cp = (7/2)R 1. What is the rate of entropy generation in W/K? 2. If the surrounding are at 20°C, what is the lost work?

Problem: Steam enters a condenser tube at 300 kPa and 82% quality. It is cooled by air to 30°C and 300 kPa. The air enters the condenser's tube bundle at 100 kPa, 20°C and leaves at 95 kPa, 50°C. Heat is transferred to the surroundings at a rate of 30 kJ/s. Find the mass flow rate of steam? Air Ú3 = 10 m/s %3D P3 100 kPa Steam T3 20°C - Q=30 kJ/s P = 300 kPa %3D 82% quality P2 = 300 kPa T2 = 30°C P4 = 95 kPa T = 50°C %3!