[kelly1]

Hello,

After determining the first 3 answers for the following question, I need to be sure that I'm on the right track with the final one;

A 1:1 shell & tube heat exchanger is required to cool 10,000 kg/h of light oil from 105°C to 20°C using cooling water which is available at 15°C and leaves at 30°C. The light oil flows inside the tubes and the water is on the shell side.

(i) Based on the stated temperatures, show whether the flow configuration concurrent or countercurrent. What is the log mean temperature difference?
(ii) Calculate the number of tubes for a linear velocity of the oil of 0.8 m/s.
(iii) Calculate the film coefficient for the oil on the inside of the tubes.
(iv) Determine whether the number of tubes calculated in (ii) is sufficient to perform the required duty.

I assume that if I compare the following 2 transfer rates, it'll tell me that the theoretical transfer rate far outweighs the actual transfer rate.

q = Uo x Ao x ΔT x N = 256.13 x (4 x π x 0.0160) x 25.85 x 33 = 4390.362 W

q = mass flow rate * cp * (deltaT) * 33 = 15,264,980 W

Could someone please confirm that I have the right idea?

Cheers,

Kelly