the total entropy change

| January 30, 2015

In large steam power plants, the feed water is frequently heated in closed feed water heaters, which are basically heat exchangers, by steam extracted from the turbine at some stage. Steam enters the feed water heater at 1 MPa and 200°C and leaves as saturated liquid at the same pressure. Feed water enters the heater at 2.5 MPa and 50°C 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 feed water heater and (b) the total entropy change for this process per unit mass of the feed water.

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entropy generation
the entropy change

Category: Coursework

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