Question

PROBLEM #3 (30 points) A shell-and (N 20) is used to heat vegetable oil on the shell side using hot water on tethat side. is Lp- 3.0 m). Each copper tube has dimensions of 15.56-mm ID and 19.05-mm OD and thermal conductivity of copper is 390 W/m-K. Water at a total flow rate of 3.33 kg/s enters the tubes of the heat exchanger at 360 K and leaves at 300 K The inlet and outlet temperatures of oil are 290 K and 315 K respectively l-tube heat exchanger consisting of one shell pass and 20 copper tubes tube makes 20 with a length per pass of 3.0m (that Properties ofwater at 330 K: c.-4179J/(kg-K); k-0.6513W/ (m-K); μ = 4.9366x 104Ns/m; Pr 3.17 a) (5 points) Calculate the heat duty. (1o points) Calculate the rating UA of the shell and tube heat exchanger ve that the correction factor F (or Fa) for the log-mean temperature difference 0.55. c) (10 points) Determine the Reynolds number Rep for water flow through each tube (note that the total flow should be divided by number of tubes) and determine the inside coefficient h.

Answer 1

Sol 10 Nam ber of-tubes Number of Pawel le o rate ( mh) 3-33 - 3-33X 41360-300)

UA 834.96

% 2.11nd -fir eaa,→น.e、 RE 130&