Chapter 7, Problem 7.134EP

ESL-2 150 grams of water at 20.0°C in a pan is places in an oven that is at a constant 100.0°C. a) Starting with AS-dQr/T, clearly explain all steps – evaluating the integral and finding the mumerical value - to find the total change in entropy for the original H20 to go from 20.0°C to become steam at 100.0°C. b) Starting with AS-dQr/T, clearly explain all steps- evaluating the integral and finding the numerid value to find the change in entropy for the oven interior for this entire process. c) Find the total change in entropy for the universe for this entire process. (Neglect the change due to the warming of the pan). Use this answer to explain whether this process is reversible or irreversible.

A 5 m3rigid tank has propane at 500 kPa, 700 K and connected by a valve to another tank of 0.7 m3with propane at 350 kPa, 600 K. The valve is opened and the two tanks come to a uniform state at 350 K. What is the final pressure?For propane R = 0.1886 kJ/kgK

Q1)A steam with a quality of 9%, enters an adiabatic nozzle at 3 5 MPa and leaves at 0.4 MPa and 140°C with a floww of 2.7 m/s. Find the entrance velocity, in m/s. Maximum size for new files: 0 bytes Files,

5- Nitrogen gas flows into a convergent nozzle at 200 kPa, 400 K and very low velocity. It flows out of the nozzle at 100 kPa, 330 K. If the nozzle is insulated, find the exit velocity. a- 222 m/s b- 382 m/s c- 512 m/s d- 640 m/s AU-0 means that the process is isothermal?

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.

35 220 B/s ll Water at 10 MPa aand 200°C expands through a throttle valve to a final pressure of 0.5 MPa, the enthalpy does not change because the process is assumed to be adiabatic and no shaft work is done. What is the final state of water?

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There are required 2000 kW of compressor power to handle air adiabaticallyfrom 1 atmosphere, 27 oC, to 305 kPaa. The initial air velocity is 20 m/s and the finalvelocity is 85 m/s. a) If the compression is isentropic, find the compressor capacity, inm3/s. b) If the compression process is irreversible adiabatic to a temperature of 160 oC,with the capacity found in c), determine the compressor power input, in Hp.

A piston/cylinder receives (control mass system) R-134a at 300 kPa and compresses it in a process where the entropy does not change. to a state of 1000 kPa, 60° C. Find the initial temperature, AND THE CHANGE IN INTERNAL ENERGY.