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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10- 1 kg of Nitrogen at 150 °C and 5 bar, undergoes the following sequences of reversible processes in a piston cylinder arrangements: a- An adiabatic expansion in which the volume is doubled. b- A constant pressure process in which the volume is reduced to its initial value. A constant volume process back to the initial state. C- Calculate the net work done of this cycle.
Steam, initially at 5 MPa, 280°C undergoes a polytropic process in a piston–cylinder assembly to a final pressure of 20 MPa. If the polytropic constant, n = 1.4, calculate the non-flow work in kJ/kg.
A rigid cylindrical tank stores 80 kg of a substance at 400 kPa and 480 K while the outside temperature is 290 K. A paddle wheel stirs the system transferring shaft work at a rate of 0.7 kW. At the same time an internal electrical resistance heater transfers electricity at the rate of 1.6 kW. A. Do an energy analysis to determine the rate of heat transfer for the tank. B. Determine the absolute value of the rate at which entropy leaves the internal system (at a uniform temperature of 480 K). Answer in kW/K C. Determine the rate of entropy increase in the system's surroundings. Answer in kW/K
Steam undergoes an adiabatic expansion in a piston-cylinder assembly from 30 bar, 360°C to 3 bar, 240° 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 maximum theoretical work that could be obtained from the given initial state to the same final pressure?
One kilogram of ammonia initially at 8.0 bar and 50oC undergoes a process to 3.7 bar, 20oC while being rapidly expanded in a piston–cylinder assembly. Heat transfer between the ammonia and its surroundings occurs at an average temperature of 40oC. The work done by the ammonia is 40 kJ. Kinetic and potential energy effects can be ignored. Determine the heat transfer, in kJ, and the entropy production, in kJ/K.
A 60-lb aluminum bar, initially at T3 = 150°F, is placed in a tank together with 190 lb of liquid water, initially at Tw = 70°F, and allowed to achieve thermal equilibrium. The aluminum bar and water can be modeled as incompressible with specific heats c, = 0.216 Btu/lb-°R and Cw = 0.998 Btu/lb-°R, respectively. Consider the aluminum bar and water as the system and ignore heat transfer between the system and its surroundings. Determine the final temperature Tr, in °F, and the amount of entropy produced within the tank, in Btu/°R.
2 kg of air contained in a piston-cylinder assembly undergoes a process from the initial state of T₁ = 400K, v₁ = 0.5 m³ to the final state of T₂ = 600K, v₂ = 0.8 m³. Assume the ideal gas model with cv = 0.72 kJ/kg . K for the air. Kinetic and potential energy effects are negligible. - Can this process occur adiabatically? Demonstrate it with formulas and calculations. If yes, determine the work, in kJ, for an adiabatic process between these states. If not, determine the direction of the heat transfer (in or out of the system). Determine the temperature of the isentropic process with the same initial state, T₁ = 400K, v₁ = 0.5 m³, and the same final specific volume: v₂ = 0.8 m³.
In a gas apparatus, it was recorded that the expansion index was 1.26 andthe molar mass of gas is 26 kg/kmol. The gas is taken as a perfect gas andexpands reversibly from 727 ˚C, 0.003 m3to 2 ˚C, 0.6 m3, according to a linear law. 1. Show the process on a T-s diagram including the line of constant temperature and volume.2. determine the specific gas constant for this gas3. specific heat capacity at constant volume
Carbon dioxide (molar mass 44 kg/mol) expands reversibly in a perfectly thermally insulated cylinder from 3.7 bar, 220 degrees Celsius to a volume of 0,085 m³. If the initial volume occupied was 0,02 m³, calculate the gas constant, adiabatic index,final pressure and work input. Assume nitrogen to be a perfect gas and take cv=0,63 KJ/kgK
5. Steam expands quasi-statically and isothermally from 800 kPa and 200C to a final pressure of 200 kPa. Determine the work done in kJ/kg.
A cylinder that contains 0.068 kg of carbon dioxide (with molar mass 44 kg/kmol), occupying a volume of 0.027 m3 at 1 bar is compressed reversibly until the pressure is 5.27 bar. If the molar (universal) gas constant as 8.3145 kJ/kmol K, calculate the the work done on the C02 (in J) when the process is isothermal.
A fluid at 0.6 bar occupying 0.07 m3 is compressed reversibly to a pressure of 9.5 bar and specific volume of 0.3 m3/kg according to the law pvn = c. The fluid then expands reversibly according to the law pv2 = c to 2.3 bar. A reversible cooling at constant volume then restores the fluid back to initial state. Calculate the work for the compression in the process.

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