2. 160m2/min of air will be heated at 1 atm from 15C to 45C by passing it normally through a bank of vertical tubes that are 1.5m long. Each bank is 6 rows wide and 4 rows deep and the casing is 39cm wide. Outside tube diameter is 3cm and ALIGNED pitches (clearance = twice the diameter) is used. Steam at 225C flows inside the tubes. Assume no leakage. If the number of bank of tubes needed is 5, find the exit temperature of air (not 45degC ). Neglect the resistance of steam and pipe wall Assume FT=1