Chemical Engineering > GATE 2026 > Double Pipe Heat Exchangers
In a double pipe cocurrent heat exchanger, operating at steady state, oil (specific heat capacity = 2100 J kg−1 °C−1) entering at 7 kg s−1 at 100 °C is used to heat water (specific heat capacity = 4200 J kg−1 °C−1) flowing at 3.5 kg s−1 from 20 °C to 50 °C. If the overall heat transfer coefficient is 291 W m−2 °C−1, the required heat transfer area (in m2) is _____ (rounded off to one decimal place).
Correct : 35.0
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