In a counter-flow heat exchanger, water is heated at the rate of 1.5 k – McqOptions

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1.	In a counter-flow heat exchanger, water is heated at the rate of 1.5 kg/s from 40° C to 80° C and oil entering at 120°C and leaving 60°C. The specific heats of water and oil are 4.2 kJ/kg-K and 2 kJ/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
Answer» E.

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