Q3 In large steam power plants, the feedwater is frequently heated in closed feedwater heaters, which are basically heat exchangers, by steam extracted from the turbine at some stage. Steam enters the feedwater heater at 1.6 MPa and 250 °C and leaves as saturated Steam from turbine 2 MPa 225 oC Feedwater з Мра 25 oC liquid at the same pressure. Feedwater enters the heater at 4 MPa and 30 oC and leaves 10 °C below the exit temperature of the steam. Neglecting any heat losses from the outer surfaces of the heater, determine (a) the ratio of the mass flow rates of the extracted steam and the feedwater heater and (b) the reversible work for this process per unit mass of the feedwater. Assume the surroundings to be at 25 °C. sat. liquid

Q3 In large steam power plants, the feedwater is frequently heated in closed feedwater heaters, which are basically heat exchangers, by steam extracted from the turbine at some stage. Steam enters the feedwater heater at 1.6 MPa and 250 °C and leaves as saturated Steam from turbine 2 MPa 225 oC Feedwater з Мра 25 oC liquid at the same pressure. Feedwater enters the heater at 4 MPa and 30 oC and leaves 10 °C below the exit temperature of the steam. Neglecting any heat losses from the outer surfaces of the heater, determine (a) the ratio of the mass flow rates of the extracted steam and the feedwater heater and (b) the reversible work for this process per unit mass of the feedwater. Assume the surroundings to be at 25 °C. sat. liquid

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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Q3
In large steam power plants, the feedwater is frequently heated in
closed feedwater heaters, which are basically heat exchangers, by
steam extracted from the turbine at some stage. Steam enters the
feedwater heater at 1.6 MPa and 250 °C and leaves as saturated
liquid at the same pressure. Feedwater enters the heater at 4 MPa
and 30 oC and leaves 10 °C below the exit temperature of the
steam. Neglecting any heat losses from the outer surfaces of the
heater, determine (a) the ratio of the mass flow rates of the
extracted steam and the feedwater heater and (b) the reversible
work for this process per unit mass of the feedwater. Assume the
surroundings to be at 25 °C.
2 MPa
225 oC
Steam
from
turbine
Feedwater
з Мра
25 oC
sat. liquid

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