Oil is heated from 38 to 93°C by flowing inside the 1-in, 16 BWG tubes of a heat exchanger. Steam condenses outside the tubes at 100°C. The flow rate of oil is 1.26 kg/s and the inside area of the heat exchanger tubes is 18.60 m2; the specific heat of the oil is 3140 j/kg K.
Oil is heated from 38 to 93°C by flowing inside the 1-in, 16 BWG tubes of a heat exchanger. Steam condenses outside the tubes at 100°C. The flow rate of oil is 1.26 kg/s and the inside area of the heat exchanger tubes is 18.60 m2; the specific heat of the oil is 3140 j/kg K.
a) Whatistheoverallheattransfercoefficientbasedontheinsidearea?
b)
If the steam-side coefficient is 2990 W/m2 K, what is the oil-side coefficient? Neglect the resistance of the tube wall.
c)
In order to increase the heat capacity, the steam pressure is increased so that it condenses at 149°C. What flow rate of oil is now obtained if the oil is still heated from 38 to 93°C?
Assume that the steam–side coefficient remains 2990 W/m2 K and that the properties of the oil are not changed by the new steam-side temperature.
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