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FIRST LAW OF THERMODYNAMICS 203

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Example 4.59. Steam enters a steam turbine at a pressure of 15 bar and 350°C with a
velocity of 60 m/s. The steam leaves the turbine at 1.2 bar and with a velocity of 180 m/s. Assum-
ing the process to be reversible adiabatic, determine the work done per kg of steam flow through
the turbine.
Neglect the change in potential energy.

(a)

(b)

Fig. 4.70

Solution. Initial pressure of steam, p 1 = 15 bar

Initial temperature of steam, t 1 = tsup = 350°C

Initial velocity of steam, C 1 = 60 m/s

Final pressure, p 2 = 1.2 bar

Final velocity, C 2 = 180 m/s