2. Air enters a bank of 1.5-m-long tubes at 30 C and 1 atm with a mean velocity of 5 m/s. The outer diameter of the tubes is 2.0 cm; the tubes are arranged in staggered orientation and St. ST 4.5 cm. There are 10 tubes in the flow direction and each row involves 20 tubes. Calculate the (a) the rate of heat transfer to the air stream, and (b) the pressure drop through the bank, if steam is condensing inside the tubes at 120 C.