A tube bank uses an in-line arrangement with Sn = Sp =1.9 cm and 6.33-mmdiameter tubes. Six rows of tubes are employed with a stack 50 tubes high. The surface temperature of the tubes is constant at 90oC, and atmospheric air at 20oC is forced across them at an inlet velocity of 4.5 m/s before the flow enters the tube bank. Calculate the total heat transfer per unit length for the tube bank. Estimate the pressure drop for this arrangement.