A tube bank uses an aligned arrangement of 15-mm-diameter and 2-meter-long tubes with 30 mm and 40 mm. There are 22 rows of tubes with 22 tubes per row. Steam at a pressure of 2.455 bar passes through the tubes, maintaining a uniform outer tube surface temperature of 390 K, while air is in cross flow over the tubes. If the air enters the tube bank at 300 K with a velocity of 4 m/s, find the air outlet temperature, the total heat transfer rate, and the rate of condensation.

At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2