Question
In a counter-flow double pipe heat exchanger, oil (m = 2 kg/s, CP = 2.1 kJ/kg.°C) is cooled from 90 °C to 40 °C by water (m = 1 kg/s, CP 4.2 kJ/kg.°C) which enters the inner tube at 10 °C. The radius of the inner tube is 3 cm and its length is 5 m. Neglecting the wall resistance, the overall heat
transfer coefficient based on the inner radius, in kW / m2. K, is
transfer coefficient based on the inner radius, in kW / m2. K, is
Answer: Option B
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