Steam undergoes an adiabatic expansion in a piston-cylinder assembly from 100 bar, 400°C to 1 bar, 160°C. What is work in kJ per kgof steam for the process? Calculate the amount of entropy produced, in kJ/K per kg of steam. What is the magnitude of the maximumtheoretical work that could be obtained from the given initial state to the same final pressure?

ENERGY BALANCE is a state of a body at which there is no disturbance in a system neither inside nor…

Answered: Steam undergoes an adiabatic expansion…

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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Steam undergoes an adiabatic expansion in a piston–cylinder assembly from 100 bar, 680°C to 1 bar, 160°C. What is work in kJ per kg of steam for the process? Calculate the amount of entropy produced, in kJ/K per kg of steam. What is the magnitude of the maximum theoretical work that could be obtained from the given initial state to the same final pressure?
Steam undergoes an adiabatic expansion in a piston-cylinder assembly from 100 bar, 360°C to 1 bar, 160°C. What is the work in kJ per kg of steam for the process? Calculate the amount of entropy produced, in kJ/K per kg of steam. What is the maximum work that could be obtained from the given initial state to the same final pressure? Show both processes on a property labeled sketch of the T-s diagram.
Q: 1.1m³ of air is heated reversibly at constant pressure from 25°C to 310°C, and then cooled reversibly at constant volume back to the initial temperature, the initial pressure is 1 bar. Calculate: 1. The net heat flow, 2. The overall change of entropy. 3. Sketch all processes on (T-S. P-V. T-V) diagrams.
What is the change in entropy when 120 g of superheated methanol gas at 1.00 bar and 110.0 °C is cooled and condensed to liquid methanol at 1.00 bar and 90.5 °C?
DESCRIBE THE ENTROPY CHANGE OF PURE SUBSTANCES?
An ideal gas changes reversibly and quasistatically from state i to state f along paths iaf and ibf. If the heat added along iaf is 50.0 cal then the work done by the gas along iaf is 22.2 cal. If the heat added along ibf is 44.4 cal, what must the work along ibf be?
Water vapor enters a valve at 0.7 bar, 360oC, and exits at 0.35 bar. If the water vapor undergoes a throttling process (means constant enthalpy & reduce pressure significantly), determine the rate of entropy production within the valve, in kJ/K per kg of water vapor flowing.
Consider 5.2 pounds per minute of water vapor at 100 lbf/in2, 500oF, and a velocity of 100 ft/s entering a nozzle operating at steady state and expanding adiabatically to the exit, where the pressure is 40 lbf/in2. The isentropic nozzle efficiency is 95.0%. Determine the velocity of the steam at the exit, in ft/s, and the rate of entropy production, in Btu/min·oR.
One-quarter lbmol of oxygen gas (O2) undergoes a process from p1 = 20 lbf/in2, T1 = 500oR to p2 = 150 lbf/in2. For the process W = -500 Btu and Q = -152.5 Btu. Assume the oxygen behaves as an ideal gas. Determine the change in entropy, in Btu/oR.
(a) Steam at 20 bar and 375 °C expands reversibly in a perfectly thermally insulated cylinder behind a piston until the pressure is 0.35 bar. Sketch the p-v and T-s diagrams for the process and calculate the work done per kilogram of steam for this process.(b) If the process in 3 (a) takes place in a steam turbine which is also perfectly thermally insulated, calculate the work done per kilogram of steam and the mass flow rate of steam for the turbine to develop a power output of 1600 kW. (c) How will the results for Part (a) and Part (b) compare with that for actual processes, explain the reason for any difference and the effect on the steam mass flow rate to produce the same power output in Part (b) for the actual process.
A rigid vessel of 0.075 m3 volume contains an ideal gas, CV = 5/2 R at 540 K and 1 bar. If heat in the amount of 15,800 J is transferred to the gas, determine its entropy change.
Saturated water vapor at 300°F enters a compressor operating at steady state with a mass flow rate of 5 lb/s and is compressed adiabatically to 800 lbf/in.2 If the power input is 2150 hp, determine for the compressor (a) the isentropic compressor efficiency and (b) the rate of entropy production, in hp/°R. Ignore kinetic and potential energy effects.

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