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 which steam is condensed in kg/s?
(a) 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.