Exhaust gas at 400°C and 1 bar from internal-combustion engines flowsat the rate of 125 mol-s¹ into a waste-heat boiler where saturated steam isgenerated at a pressure of 1200kPa. Water enters the boiler at 20°C (To), andthe exhaust gases are cooled to within 10°C of the steam temperature. The heatcapacity of the exhaust gases is Cp /R =3.34 + 1.12 x10-³ T/K. The steamflows into an adiabatic turbine and exhausts at a pressure of 25 kPa. If theturbine efficiency n is 72%,(a) What is Ws, the power output of the turbine?(b) What is the thermodynamic efficiency of the boiler/turbine combination?(c) Determine SG for the boiler and for the turbine.(d) Express Wlost (boiler) and Wlost (turbine) as fractions of | Wideal ], the idealwork of the process.

Exhaust gas at 400°C and 1 bar from internal-combustion engines flows at the rate of 125 mol s¹ into a waste-heat boiler where saturated steam is generated at a pressure of 1200kPa. Water enters the boiler at 20°C (To), and the exhaust gases are cooled to within 10°C of the steam temperature. The heat capacity of the exhaust gases is Cp/R =3.34 + 1.12 x10-3 T/K. The steam flows into an adiabatic turbine and exhausts at a pressure of 25 kPa. If the turbine efficiency n is 72%, (a) What is Ws, the power output of the turbine? (b) What is the thermodynamic efficiency of the boiler/turbine combination? (c) Determine SG for the boiler and for the turbine. (d) Express W (boiler) and W (turbine) as fractions of I W.. J the ideal

Exhaust gas at 400°C and 1 bar from internal-combustion engines flows at the rate of 125 mol s¹ into a waste-heat boiler where saturated steam is generated at a pressure of 1200kPa. Water enters the boiler at 20°C (To), and the exhaust gases are cooled to within 10°C of the steam temperature. The heat capacity of the exhaust gases is Cp/R =3.34 + 1.12 x10-3 T/K. The steam flows into an adiabatic turbine and exhausts at a pressure of 25 kPa. If the turbine efficiency n is 72%, (a) What is Ws, the power output of the turbine? (b) What is the thermodynamic efficiency of the boiler/turbine combination? (c) Determine SG for the boiler and for the turbine. (d) Express W (boiler) and W (turbine) as fractions of I W.. J the ideal

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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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

Exhaust gas at 400°C and 1 bar from internal-combustion engines flows
at the rate of 125 mol-s¹ into a waste-heat boiler where saturated steam is
generated at a pressure of 1200kPa. Water enters the boiler at 20°C (To), and
the exhaust gases are cooled to within 10°C of the steam temperature. The heat
capacity of the exhaust gases is Cp /R =3.34 + 1.12 x10-³ T/K. The steam
flows into an adiabatic turbine and exhausts at a pressure of 25 kPa. If the
turbine efficiency n is 72%,
(a) What is Ws, the power output of the turbine?
(b) What is the thermodynamic efficiency of the boiler/turbine combination?
(c) Determine SG for the boiler and for the turbine.
(d) Express Wlost (boiler) and Wlost (turbine) as fractions of | Wideal ], the ideal
work of the process.

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