Steam produced in a boiler is frequently ‘wet”—that is. it is a mist composed of saturated water vapor and entrained liquid droplets. The quality of a wet steam is defined as the fraction of the mixture by mass that is vapor.

A wet steam at a pressure of 5.0bar with a quality of 0.85 is isothermally ‘dried” by evaporating the entrained liquid. The flow rate of the dried steam is 52.5m3/h.

(a). Use the steam tables to determine the temperature at which this operation occurs the spec enthalpies of the wet and dry steams, and the total mass flow rate of the process stream.

(b). Compute the heat input (kW) required for the evaporation process. Discuss.