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A counter flow shell and tube type heat exchanger is used to heat water at a rate of 0.8 kg/sec from 30C to 80C with

A counter flow shell and tube type heat exchanger is used to heat water at a rate of 0.8 kg/sec from 30C to 80C with hot oil entering at 120C and leaving at

85C. Over all heat transfer coefficient is 125 W/mC. Calculate the size of heat exchanger required. Take specific heat for water as 4180 J/kgC.

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