An insulated free-moving piston-cylinder device contains 0.5L ofsaturated liquid water at a constant pressure of 100 kPa. An electricresistance heater inside the cylinder is now turned on, and 1178.36 kJ ofelectrical work is transferred to the steam. Determine (a) the entropychange of the water during this process; (b) the entropy generation duringthis process?1178.36 kl

Answered: Image /qna-images/answer/915016cb-d920-4180-b9ff-a56827d936bb.jpg

Answered: An insulated free-moving…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A well-insulated rigid tank contains 3.5 kg of a saturated liquid-vapor mixture of water at 200 kPa. Initially, three-quarters of the mass is in the liquid phase. An electric resistance heater placed in the tank is now turned on and kept on until all the liquid in the tank is vaporized. Determine the entropy change of the steam during this process. Use steam tables. H₂O 200 kPa We The entropy change of the steam during this process is kJ/K.
Determine (a) the entropy change of the refrigerant, (b) the entropy change of the cooled space
A piston–cylinder device initially contains 15 ft3 ofhelium gas at 25 psia and 70F. Helium is now compressed ina polytropic process (PVn = constant) to 70 psia and 3008F.Determine (a) the entropy change of helium, (b) the entropychange of the surroundings, and (c) whether this process isreversible, irreversible, or impossible. Assume the surroundingsare at 70F.
A 0.5-m³ rigid tank contains refrigerant-134a initially at 250 kPa and 45 percent quality. Heat is transferred now to the refrigerant from a source at 35°C until the pressure rises to 450 kPa. Determine: a. The entropy change of the refrigerant. b. The entropy change of the heat source. C. The total entropy change for this process. Using EES software, investigate the effect of the source temperature and final pressure on the total entropy change for the process. Let the source temperature vary from 30°C to 210°C, and the final pressure vary from 300 to 500kPa. Plot the total entropy change for the process as a function of the source temperature for final pressures of 300 kPa, 400 kPa, and 500 kPa, and discuss the results.
What is entropy and its application?
H.W: (1) An insulated piston-cylinder device contains 5 L of saturated liquid water at a constant pressure of 150 KPa. An electrical resistance heater inside the piston is turned on now and electrical work done on steam is 2200 W. Find: (a) initial and final temperature of water (T1 and T2), (b) the work done during this process (W1-2 ), (c) the entropy change of water and show if the process is possible or not, and (d) plot P-V and T- s diagrams.
Is a process during which no entropy is generated (Sgen = 0) necessarily reversible?
Oxygen gas is compressed in a piston-cylinder device from an initial state of 0.8 m3/kg and 20 degress C to a fnal state of 0.1m3/kg and 300 degress C. Determine the entropy change of the oxygen during the process. Assume constant specific heats.
Air enters the compressor of a gas turbine plant at ambient conditions of 100 kPa and 25° C with alow velocity and exits at 1 MPa and 347° C with a velocity of 90 m/s. The compression process isreversible adiabatic, and the power input is 228 W. Determine the mass flowrate ofthe air through the compressor. Solve this problem using property table.
Air is compressed by a 40-kW compressor from P1 to P2. The air temperature is maintained constant at 25°C during this process as a result of heat transfer to the surrounding medium at 20°C. Determine the rate of entropy change of the air. The rate of entropy change of the air is _____kW/K. The answer is not 0.1342
1) Consider the system shown in the figure. When the pins fall away, the gas expands against aconstant external pressure to 1 atm. How much work was performed on the surroundings?Calculate univ S for this irreversible process, and determine the additional work T S univthat could have been extracted had the expansion to the same final pressure been carriedout reversibly. (Alternatively, think of a way to carry out a reversible expansion and calculatethe reversible work. The difference between the reversible work and the work youcalculated for the irreversible process above is the additional work.)
Heat flows through a wall of a house at a steady-state on a day when the temperature of the outdoor air is 1°C and the air inside the house is maintained at 23°C. The temperatures of the inner surface of the wall is 4°C cooler than indoor air temperature. And the temperature of the outer surface of the wall is 2°C warmer than the outdoor air temperature. The rate of heat transfer through the wall is 900W. Determine the rate of total entropy generation associated with this heat transfer process (in W/K).

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