13. In a steam turbine plant, the initial pressure and temperature of the steam are 3 MN/m² and 320°C, respectively and the exhaust pressure is 0-06 MN/m². After isentropic expansion to 1 MN/m2 the steam is reheated isobarically to 250°C and after further isentropic expansion in the turbine to 0-4 MN/m2 it is again reheated isobarically to 200°C. The steam is finally expanded isentropically in the turbine to exhaust pressure. Indicate, by means of a sketch, the expansion of the steam through the turbine and the reheat processes as they would appear on the enthalpy- entropy diagram. Determine the thermal efficiency of the arrangement and compare this with the Rankine efficiency for the same initial conditions and final pressure.

13. In a steam turbine plant, the initial pressure and temperature of the steam are 3 MN/m² and 320°C, respectively and the exhaust pressure is 0-06 MN/m². After isentropic expansion to 1 MN/m2 the steam is reheated isobarically to 250°C and after further isentropic expansion in the turbine to 0-4 MN/m2 it is again reheated isobarically to 200°C. The steam is finally expanded isentropically in the turbine to exhaust pressure. Indicate, by means of a sketch, the expansion of the steam through the turbine and the reheat processes as they would appear on the enthalpy- entropy diagram. Determine the thermal efficiency of the arrangement and compare this with the Rankine efficiency for the same initial conditions and final pressure.

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

Basic Thermodynamic Processes

The word 'thermodynamics' can be divided into two words, 'thermo' and 'dynamics'. The word thermo deals with the heat and thermal phenomenon, whereas dynamics deals with forces or external agent that drives the heat flow or aids in the motion of heat.

Question

2 13. In a steam turbine plant, the initial pressure and temperature of the
steam are 3 MN/m2 and 320°C, respectively and the exhaust pressure is
0-06 MN/m2. After isentropic
reheated isobarically to 250°C and after further isentropic expansion in
the turbine to 0-4 MN/m2 it is again reheated isobarically to 200°C. The
steam is finally expanded isentropically in the turbine to exhaust pressure.
Indicate, by means of a sketch, the expansion of the steam through the
turbine and the reheat processes as they would appear on the enthalpy-
entropy diagram. Determine the thermal efficiency of the arrangement
and compare this with the Rankine efficiency for the same initial conditions
and final pressure.
expansion to I MN/m2 the steam is
16.59: 26:8 9/1

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