An air heater for an industrial application consists of
Chapter 8, Problem 8.38(choose chapter or problem)
An air heater for an industrial application consists of aninsulated, concentric tube annulus, for which air flowsthrough a thin-walled inner tube. Saturated steam flowsthrough the outer annulus, and condensation of the steammaintains a uniform temperature Tson the tube surface.Consider conditions for which air enters a 50-mm-diameter tube at a pressure of 5 atm, a temperature ofTm,i?17C, and a flow rate of , whilesaturated steam at 2.455 bars condenses on the outersurface of the tube. If the length of the annulus isL?5 m, what are the outlet temperature Tm,oand pres-sure poof the air? What is the mass rate at which con-densate leaves the annulus?
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