Hot water is used to heat air in a double-pipe heat exchanger as shown in the following sketch. If the

heat transfer coefficients on the water side and on the air side are 550 W/m² K and 55 W/m² K respectively, calculate the overall heat transfer coefficient
based on the outer diameter. The heat exchanger pipe is 5-cm, schedule 40 steel (k = 54 W/m K) with water inside.

Transcribed Image Text:

Air Water 5 cm, schedule 40 steel pipe