Liquid water is fed to a boiler at 24°c and 10 bar is converted at a constant pressure to saturated steam.

a) use the steam tables to calculate δh (kj/kg) for this process, and then calculate the heat input required to produce 15,000 m
3 /h of steam at the exiting conditions.

b) assume that the kinetic energy of the entering liquid is negligible and that the steam is discharged through a 15-cm id pipe.

We can find the change in the enthalpy through the tables A5 for Saturated water, pressure table.

For 1bar=1000kPa:

Replacing,

With the specific volume we know can calculate the mass flow, that is

Then the heat required in input is,

With the same value required of 15000m^3/h, we can calculate the velocity of the water, that is given by,

Finally we can apply the steady flow energy equation, that is

Re-arrange for Q,

We can note that consider the Kinetic Energy will decrease the heat input.

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