In the question below why does\'nt the solution use m flow rate in the calculati

Question

In the question below why does'nt the solution use m flow rate in the calculation?

Steam flows steadily through an adiabatic turbine. The inlet conditions of the steam are 10 MPa, 450?C, and 80 m/s, and the exit conditions are 10 kPa, 92 percent quality, and 50 m/s. The mass flow rate of the steam is 12 kg/s. Determine the change in kinetic energy.

(a) The change in kinetic energy It is expressed as ke = 1,2-v2 502-801 ke1.95 kJ/kg How come it is not 1,2-v2 Ke = m flow rate x- L = 12 kg/s x 502-802 = 12 kg/s x-2 1000 - 12 kg/s x 1.95 kJ/kg = 23.4 k/s kJ/kg 1000

Explanation / Answer

Both the ways presented above are correct.The difference is in 1st method the change in kinetic energy is found per kilogram of steam.In 2nd method the total change in kinetic energy is found.Based on what is asked in question i.e per kilogram or total change you have to answer accordingly.

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