An air-cooled steam condenser is operated with air in
Chapter , Problem 7.98(choose chapter or problem)
An air-cooled steam condenser is operated with air in cross flow over a square, in-line array of 400 tubes (NL NT 20), with an outside tube diameter of 20 mm and longitudinal and transverse pitches of SL 60 mm and ST 30 mm, respectively. Saturated steam at a pressure of 2.455 bars enters the tubes, and a uniform tube outer surface temperature of Ts 390 K may be assumed to be maintained as condensation occurs within the tubes. (a) If the temperature and velocity of the air upstream of the array are Ti 300 K and V 4 m/s, what is the temperature To of the air that leaves the array? As a first approximation, evaluate the properties of air at 300 K. (b) If the tubes are 2 m long, what is the total heat transfer rate for the array? What is the rate at which steam is condensed in kg/s? (c) Assess the effect of increasing NL by a factor of 2, while reducing SL to 30 mm. For this configuration, explore the effect of changes in the air velocity
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