Steam produced in a boiler is frequently wetthat is, it is a mist composed of saturated

Chapter 7, Problem 7.36

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Steam produced in a boiler is frequently wetthat 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 5.0 bar with a quality of 0.85 is isothermally dried by evaporating the entrained liquid. The flow rate of the dried steam is 52:5 m3/h. (a) Use the steam tables to determine the temperature at which this operation occurs, the specific enthalpies of the wet and dry steams, and the total mass flow rate of the process stream. 5 Data taken from R. C. Seagrave, Biomedical Applications of Heat and Mass Transfer, Iowa State University Press, Ames, Iowa, 1971. Equipment Encyclopedia boiler www.wiley.com/college/felder 391 WEBC07 06/04/2015 21:59:43 Page 392 (b) Calculate the heat input (kW) required for the evaporation process. (c) Suppose leaks developed in the feed pipe to the dryer and in the dryer exit pipe. Speculate on what you would see at each location.