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Heat Transfer Question on Heat Transfer

Hot oil at 110∘110^\circC heats water from 30∘30^\circC to 70∘70^\circC in a counter-current double-pipe heat exchanger. The flow rates of water and oil are 5050 kgmin−1^{-1} and 100100 kgmin−1^{-1}, respectively, and their specific heat capacities are 4.24.2 kJ kg−1^{-1}°C−1^{-1} and 2.02.0 kJ kg−1^{-1}°C−1^{-1}, respectively. Assume the heat exchanger is at steady state. If the overall heat transfer coefficient is 200200 W m−2^{-2}°C−1^{-1}, the heat transfer area AA in m2^{2} is:

A

17.9

B

1.1

C

5.2

D

35.2

Answer

17.9

Explanation

Solution

The correct option is (A):17.9