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Consider we have a Double pipe Heat Exchanger, with inner tube of diameter 20mm (neglect thickness) and outer tube of diameter 30mm. We have two fluids A & B (KA = 15W/mK and KB = 20W/mK) we desire to have their flow rates as 15m3/s and 21m3/s respectively. If their Nusselt number after calculation is Nui = 429 and Nuo = 530. What is the overall heat transfer coefficient of the equipment is no fouling exists?

Correct Answer: 168.4 KW/m2K
Here we have Nui = 429 = hi×ID/KA as A is in the inner tube for lower flow rate owing to smaller flow area, and Nuo = 530 = ho×OD/KB. We have ID = 20mm, OD = 30mm, KA = 15W/mK and KB= 20W/mK. Hence hi = 321.75 KW/m2K and ho=353.33 KW/m2K. As H = (hi-1+ho-1)-1 = 168.4 KW/m2K.

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