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water at the rate of 225 kg/hours is to be heated from 350C to 950C by...

water at the rate of 225 kg/hours is to be heated from 350C to 950C by means of a concentric tube heat exchanger. Oil at a rate of 225kg/hr with specific heat of 2095 J/kg.K and temperature of 2100C is to be used as the hot fluid. If the overall heat transfer coefficient based on the outer diameter of the inner tube is 550 W/m2.K, determine the length of heat exchanger if the outer diameter of the tube is 100 mm.

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Calculation is shown here is for counter flow concentric heat exchanger

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