Chapter 6, Problem 6.141EP

2.A piston cylinder arrangement contains steam at 10MPaa saturated liquid. Heat was transferred isothermally so that the pressure reaches 2MPaa. а. Find the final temperature of the steam. b. Find the change of entropy in kJ/kg if there is no entropy production.

Thermodynamics - sketch the device sketch at states 1 and 2. Plot and label the process on a P-v diagram. 6.136E. Helium in a piston/cylinder at 70 F, 20 psia is brought to 720 R in a reversible polytropic process with exponent n = 1.25. Find the final pressure and both the specific heat transfer and the specific work.

Q1: One kg of steam undergoes a reversible isothermal process from 20 bar and 250°C, to a pressure of 30 bar. Find the heat flow stating if it is supplied or rejected.

Two vessels A and B of different sizes are connected by a pipe with a valve. Vessel A contains 140 L of air at 3000kPa, 90oC. Vessel B, of unknown volume, contains air at 70 kPa, 5oC. The valve is opened and, when the propertieshave been determined, it is found that pm = 1400 kPa, tm = 45oC. (a) What is the mass in kg of air initially inside vessel A (b) What is the volume of vessel B in liters?

A closed constant-volume system receives 10Kj of paddle work. The system contains a nitrogen at 340kpa, 5C and occupies 0.1m^3. Find the heat in KJ (Gain or Loss) if the final temperature is 127C. Please use: Q=AU+W (Observe direction) ideal gas equation to find mass table.

Q4) A) What is the difference between R and Ru and how these two are related. B) What is the difference between the first and second law? Explain. Q5: A quantity of air occupies a volume of 30 L at a temnperature of 38°C and a pressure of raised isentropically until the volume becomes 6 L. . The temperature of the air 2KN/m 104Find the final temperature, the external work, change in internal

Q1: A cylinder/piston contains 0.1m³ of air at 110 kPa, 25°C. The air is compressed in a reversible polytropic process to a final state of 800 kPa, 200°C. Find the work done by the air, the heat transfer and the total entropy change for the process.Sketch the process on a P-V diagram.

* :the initial quality (x1) is 2 kg of ammonia is contained in a rigid sealed tank at 10 °C. The surroundings temperature is 95 °C. The ammonia is now heated until all ammonia transferred to saturated vapor at 90 °C. Tank Ammonia, 2 kg Ti = 10°C T₂ = 90 c (Sat. Vap.) ₂ for Tsun. = 95 °C == Q Find Heat transfer of ammonia And total entropy of generation

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