Question: A concentric tube heat exchanger for cooling lubricating oil is comprised of a thin-walled inner tube of 25-mm diameter carrying water and an outer tube

A concentric tube heat exchanger for cooling lubricating oil is comprised of a thin-walled inner tube of 25-mm diameter carrying water and an outer tube of 45-mm diameter carrying the oil. The exchanger operates in counter flow with an overall heat transfer coefficient of 60 W/m² ? K and the tabulated average properties.

(a) If the outlet temperature of the oil is 60?C, determine the total heat transfer and the outlet temperature of the water.

(b) Determine the length required for the heal exchanger.

T- 100C Oil - 0.1 kg/s n, Water , -0.1 kgis T-

T- 100C Oil - 0.1 kg/s n, Water , -0.1 kgis T- 30C Properties Water Oil p (kg/m') c, (J/kg K) v (m'/s) k (W/m K) 1000 800 4200 1900 7x 10 IX 10 0.64 0.134 Pr 4.7 140

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