Chapter 6, Problem 6.25P

saturated steam at 0.6 mpa is compressed in an irreversible adiabatic process with an effieciency of 80% for a final pressure of 0.46 mpa. find final and initial entropies

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One way to determine the quality of saturated steam is to throttle the steam to a low enough pressure that it exists as a superheated vapor. Saturated steam at 500 kPa is throttled to 0.1 MPa, 100 oC. Determine the quality of the steam at 400 kPa side. (Starts the calculation from mass and energy conservation)

Please include all steps and assumptions

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 piston with water vapor at a pressure of 300 kPa and a temperature of 175 oC. 20 kg of fluid is compressed up to 950 kPa pressure in the cylinder arrangement. Piston cylinder device to a heat well at 80 oC in order to keep the temperature of the water in it constant. The heat generated during compression is discarded. a) What phase is the water in the first case? In the last case, what phase is the water in? b) Find the entropy change in water by the process. c) From the cylinder, assuming that the process is a reversible process at constant temperature. Calculate the amount of heat absorbed. d) Find the entropy change of the heat well. e) Consider the total entropy change including the piston-cylinder mechanism and the heat indicate whether the transaction is reversible or irreversible when received. f) T (° C) -s (kJ / kgK) and P (Pa) - by specifying the state change saturation curves and values Show in (m³ / kg) diagrams.

An insulated chamber containing 2 L of saturated liquid water at 300 kPa constant pressure. There is a piston-cylinder assembly. One with an electric heater inside the cylinder There is a mixer. Then the water is mixed by the mixer for a while. s mixed, as well as connected to 220 volt electrici supply and 8 A current through neated by the passing heater. This state change at constant pressure 500 kJ of work is done by the mixer. Meanwhile, iquid 90 percent by mass evaporates. a) Plot the state change on T-v and P-v diagrams, paying attention to saturation lines. D) Calculate the operating time of the electric heate

One kg of steam expands isentropically from 2.1 MPa and 374°C to 93°C. Find the final quality and the work for non-flow and steady flow processes.

Q6) One kg of air is allowed to expand reversibly in a cylinder behind a piston in an isothermal process at 260°C, while the volume is doubled. The piston is then moved and heat rejected at constant pressure until the volume is the same as it was initially. Find the heat flow and the overall change of entropy.