Question

A 1 to 2 baffled shell-and-tube type heat exchanger is used as an
engine oil cooler. Cooling water flows through tubes at 25 °C at a
rate of 8.16 kg/s and exits at 35 °C. The inlet and outlet
temperatures of the engine oil are 65 and 55 °C, respectively. The
heat exchanger has 12.25-in. I.D. shell, and 18 BWG and 0.75-in.
O.D. tubes. A total of 160 tubes are laid out on a 15/16-in. triangular
pitch. By assuming Ro
(m2.K)/W , h. = 686 W/(m2.K), A/A, = 1.1476, and R
(m2.K)/W, find the
= 1.76x10-4 (m2.K)/W, A.Rw = 1.084x10-5
= 8.8x10-5

1. Heat transfer coefficient inside the tubes.
2. Total surface area of the heat exchanger.

Answer 1