1) In a piston cylinder 0.5kg of air expand polytropically from 4 bar and 1100 oC to 1 bar, the index of expansion is 1.75, find the work done and the heat transfer. Example 2.13 A steam turbine operating under steady flow conditions receives 3600 kg of steam per hour. The steam enters the turbine at a velocity of 80 m/s, an elevation of 10 m and specific enthalpy of 3276 kJ/kg. It leaves the turbine at a velocity of 150 m/sec, an elevation of 3 m and a specific enthalpy of 2465 kJ/kg. Heat losses from the turbine to the surrounding amount to 36 MJ/hr. Estimate the power output of turbine.

1) In a piston cylinder 0.5kg of air expand polytropically from 4 bar and 1100 oC to 1 bar, the index of expansion is 1.75, find the work done and the heat transfer. Example 2.13 A steam turbine operating under steady flow conditions receives 3600 kg of steam per hour. The steam enters the turbine at a velocity of 80 m/s, an elevation of 10 m and specific enthalpy of 3276 kJ/kg. It leaves the turbine at a velocity of 150 m/sec, an elevation of 3 m and a specific enthalpy of 2465 kJ/kg. Heat losses from the turbine to the surrounding amount to 36 MJ/hr. Estimate the power output of turbine.

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

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1) In a piston cylinder 0.5kg of air expand polytropically from 4 bar and
1100 oC to 1 bar, the index of expansion is 1.75, find the work done and
the heat transfer.
Example 2.13 A steam turbine operating under steady flow conditions receives
3600 kg of steam per hour. The steam enters the turbine at a velocity of 80 m/s, an
elevation of 10 m and specific enthalpy of 3276 kJ/kg. It leaves the turbine at a
velocity of 150 m/sec, an elevation of 3 m and a specific enthalpy of 2465 kJ/kg.
Heat losses from the turbine to the surrounding amount to 36 MJ/hr. Estimate the
power output of turbine.

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