Question

A thin-walled cross-flow heat exchanger is used to heat a
petrochemical whose specific heat is 1800 J (kg K)^{-1}
with hot water (C_{p} = 4180 J (kg K)^{-1}). The
petrochemical enters the heat exchanger at 20^{o}C at a
rate of 3.7 kg s^{-1}, whilst the water stream enters at
110^{o}C at a rate of 2.5 kg s^{-1}. The heat
transfer surface area of the heat exchanger is 4.8 m^{2}
and the overall heat transfer coefficient is 940.30 W
m^{-2}K^{-1}. Determine the outlet temperatures of
the (i) petrochemical and the (ii) water. Both streams are
unmixed.

Answer #1

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