In a counter flow heat exchanger water is heated at the rate of 15kgs from 40C to 80C by an oil entering at 120C and leaving at 60C The specific heats of water and oil are 42kJkgK and 2kJkgK respectively The overall heat transfer coefficient is 400 Wm2 K The required heat transfer surface area in m2 is

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## In a counter-flow heat exchanger, water is heated at the rate of 1.5kg/s from 40°C to 80°C by an oil entering at 120°C and leaving at 60°C. The specific heats of water and oil are 4.2kJ/kg/K and 2kJ/kg.K respectively. The overall heat transfer coefficient is 400 W/m2 .K. The required heat transfer surface area (in m2) is

A. 0.104
B. 0.022
C. 10.4
D. 21.84

By:Oshal-Borkar

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Ans. D.

aksingh1818

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