4.6 1 kg of steam undergoes a reversible isothermal process from 20 bar and 250°C to apressure of 30 bar. Calculate the heat flow, stating whether it is supplied or rejected,and sketch the process on a T-s diagram.(-135 kJ/kg)4.7 1 kg of air is allowed to expand reversibly in a cylinder behind a piston in such a waythat the temperature remains constant at 260°C while the volume is doubled. The pistonis then moved in, and heat is rejected by the air reversibly at constant pressure untilthe volume is the same as it was initially. Calculate the net heat flow and the overallchange of entropy. Sketch the process on a T-s diagram.(-161.9 kJ/kg; -0.497 kJ/kg K)4.8 Steam at 5 bar, 25 °C, expands isentropically to a pressure of 0.7 bar. Calculate the finalcondition of the steam.(0.967)4.9 Steam expands reversibly in a cylinder behind a piston from 6 bar dry saturated, to apressure of 0.65 bar. Assuming that the cylinder is perfectly thermally insulated, calculatethe work done during the expansion per kilogram of steam. Sketch the process on aT-s diagram.(323.8 kJ/kg)4.10 1 kg of a fluid at 30 bar, 300 C, expands reversibly and isothermally to a pressure of0.75 bar. Calculate the heat flow and the work done (i) when the fluid is air, (ii) whenthe fluid is steam. Sketch each process on a T-s diagram.(607 kJ/kg; - 607 kJ/kg; 1035 kJ/kg; - 975 kJ/kg)4.12 1 kg of air at 1.013 bar, 17 C, is compressed according to a law pu constant, untilthe pressure is 5 bar. Calculate the change of entropy and sketch the process on a T-sdiagram, indicating the area which represents the heat flow.(-0.0885 kJ/kg)4.13 0.06 m' of ethane (molar mass 30 kg/kmol), at 6.9 bar and 260°C, is allowed to expandisentropically in a cylinder behind a piston to a pressure of 1.05 bar and a temperatureof 107°C. Calculate 7, R, e,, c., for ethane, and calcuiate the work done during theexpansion. Assume ethane to be a perfect gas.The same mass of ethane at 1.05 bar, 107 C, is compressed to 6.9 bar according toa law pu1. = constant. Calculate the final temperature of the ethane and the heat flowto or from the cylinder walls during the compression. Calculate also the change ofentropy during the compression, and sketch both processes on a p-t and a T-s diagram.(1.219; 0.277 kJ/kg K; 1.542 kJ/kg K; 1.265 kJ/kg K; 54.2 kJ; 377.7°C; 43.4 kJ;0.0862 kJ/K)

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4.6 1 kg of steam undergoes a reversible isothermal process from 20 bar and 250°C to a pressure of 30 bar. Calculate the heat flow, stating whether it is supplied or rejected, and sketch the process on a T-s diagram.

4.6 1 kg of steam undergoes a reversible isothermal process from 20 bar and 250°C to a pressure of 30 bar. Calculate the heat flow, stating whether it is supplied or rejected, and sketch the process on a T-s diagram.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

4.6 1 kg of steam undergoes a reversible isothermal process from 20 bar and 250°C to a
pressure of 30 bar. Calculate the heat flow, stating whether it is supplied or rejected,
and sketch the process on a T-s diagram.
(-135 kJ/kg)
4.7 1 kg of air is allowed to expand reversibly in a cylinder behind a piston in such a way
that the temperature remains constant at 260°C while the volume is doubled. The piston
is then moved in, and heat is rejected by the air reversibly at constant pressure until
the volume is the same as it was initially. Calculate the net heat flow and the overall
change of entropy. Sketch the process on a T-s diagram.
(-161.9 kJ/kg; -0.497 kJ/kg K)
4.8 Steam at 5 bar, 25 °C, expands isentropically to a pressure of 0.7 bar. Calculate the final
condition of the steam.
(0.967)
4.9 Steam expands reversibly in a cylinder behind a piston from 6 bar dry saturated, to a
pressure of 0.65 bar. Assuming that the cylinder is perfectly thermally insulated, calculate
the work done during the expansion per kilogram of steam. Sketch the process on a
T-s diagram.
(323.8 kJ/kg)
4.10 1 kg of a fluid at 30 bar, 300 C, expands reversibly and isothermally to a pressure of
0.75 bar. Calculate the heat flow and the work done (i) when the fluid is air, (ii) when
the fluid is steam. Sketch each process on a T-s diagram.
(607 kJ/kg; - 607 kJ/kg; 1035 kJ/kg; - 975 kJ/kg)
4.12 1 kg of air at 1.013 bar, 17 C, is compressed according to a law pu constant, until
the pressure is 5 bar. Calculate the change of entropy and sketch the process on a T-s
diagram, indicating the area which represents the heat flow.
(-0.0885 kJ/kg)
4.13 0.06 m' of ethane (molar mass 30 kg/kmol), at 6.9 bar and 260°C, is allowed to expand
isentropically in a cylinder behind a piston to a pressure of 1.05 bar and a temperature
of 107°C. Calculate 7, R, e,, c., for ethane, and calcuiate the work done during the
expansion. Assume ethane to be a perfect gas.
The same mass of ethane at 1.05 bar, 107 C, is compressed to 6.9 bar according to
a law pu1. = constant. Calculate the final temperature of the ethane and the heat flow
to or from the cylinder walls during the compression. Calculate also the change of
entropy during the compression, and sketch both processes on a p-t and a T-s diagram.
(1.219; 0.277 kJ/kg K; 1.542 kJ/kg K; 1.265 kJ/kg K; 54.2 kJ; 377.7°C; 43.4 kJ;
0.0862 kJ/K)

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