A counterflow, concentric tube heat exchanger used for engine cooling has been in service for an...

A counterflow, concentric tube heat exchanger used for engine cooling has been in service for an extended period of time. The heat transfer surface area of the exchanger is 5 m², and the design value of the overall convection coefficient (without any fouling) is 38 W/m²K. During a test run, engine oil flowing at 0.1 kg/s is cooled from 110^oC to 66^oC by water supplied at a temperature of 25^oC and a flow rate of 0.18 kg/s. Determine whether fouling has occurred during the service period. If so, calculate the fouling factor, R^”_f (m²K/W). Specific heat of engine oil is 2166 J/kgK, and water is 4178 J/kgK.

What is R^”_f = x 10^-3 m²K/W?

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samet mamat answered 1 year ago

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