Example 6-1 Subcooled liquid water at 5°C and 100 kPa is pumped to a final pressure of 490 kPa. The inlet pipe has a diameter of 2 cm and the velocity is 16.4 m/s. If the isentropic efficiency of the pump is 73%, determine the work required. Solution: The mass flow rate is mAρ=±V3kgdensity(water,5,100)1000mTP====22342kgm2cm1m100016.4ms210cmmπ⎛⎞⎛⎞⎛⎞=⎜⎟
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