Question

A horizontal shel-and-tube heat exchanger with two tube passes and one shell pass is being used to heat 9 kg/s of 100% ethanol from 25 to 65 C at atmospheric pressure. The ethanol pasar through the inside of the tubes, and saturated steam at 115 C condenses an the shell of the tubes. The tubes are atell with an OD of 0.019 m and a BWG of 14. The exchanger contains a total of 100 tubes (50 tubes per pass). The ratio of total inside-tube cross-sectional area per pass to header cross-sectional area per pass S_i/S_{h c}an be assumed to be 0.5.

Estimate:

a) the film coefficient for the etahnol

b) the pressure drop due to friction throug the tube side of the exchanger.

Answer 1