A.The velocity of the steam is sometimes changed by expansion by changing the pr

Question

A.The velocity of the steam is sometimes changed by expansion by changing the pressure and temperature between the entrance and the exit streams. The enthalpy of the entrance steam is 3,000 kJ/kg steam, and the velocity is 5 m/s; the enthalpy of the exit steam is 2,800 kJ/kg steam. Heat is also provided to the system with a value of 50 kJ/kg steam. Calculate the velocity of the exit steam in the unit of m/s. You should carry the units in your calculations. You can assume the values of potential energy and work to be negligible. B Assume the steam in Question A is fed from a height of 200 ft, calculate the velocity of the exit steam. All other conditions are identical as in Question A.

Explanation / Answer

V12    + h1 =    V22 + h2

2                     2

Where V1= Velocity of steam at inlet, h1= enthalpy at inlet, V2= velocity at outlet, h2= enthalpy at outlet

On substituting and simplyfying we get velocity at outlet =14.5 m/s

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