Calculate the overall heat transfer coefficient and the rate of heat flow from the hot gasses to the cold air in the cross flow tube-bank of heat exchanger shown in the accompanying illustration for the following operating conditionsAir flow rate = 3000 lb/h.Hot gas flow rate = 5000 lb/h.Temperature of hot gasses entering exchanger = 1600?F.Temperature of cold air entering exchanger = 100?F.Both gases are approximately at atmospheric pressure.GIVENThe crossflow tube bank heat exchanger shown aboveAir flow rate (ma) = 3000 lb/hGas flow rate (mg) = 5000 lb/hEntrance temperaturesAir (Ta,in) = 100?FGas (Tg,in) = 1600?FBoth gases are at 1 atm pressureASSUMPTIONSThe hot gases have the same thermal properties as airNo scalingThermal resistance of the tube walls can beneglected

Transcribed Image Text:

MInimum Flow Area Heat Exchanger, Top Vlew Shown by Heavy LUne 2 In 1 h. 9 n. Alr In 12 In. In." 2 In. AF In t1ttttt 40 tubes Hot Gas In 11 In. Sectlon A-A 1 in. 10.902 In. Tube detall