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A counter current double pipe heat exchanger is used to boil but not superheat water at...

A counter current double pipe heat exchanger is used to boil but not superheat water at 100 DegreeC at rate of about 0.1 kg/s. This is achieved by flowing hot oil at 400 DegreeC through the inner pipe at a rate of 5 kg/s.

Latent heat of water: 2265 kJ/kg

Heat capacity of water: 4180 J/kgK

Heat capacity of the oil: 1800 J/kgK

What is the temperature of he hot oil leaving the heat exchanger?

What is the overall heat transfer coefficient if the diameter of the inner pipe is 40mm, and the tube length is 12m? Assume the pipe has negligible thickness.

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