Hot oil, which enter a cross-flow heat exchanger at 200 C and leave at 100 C, are used to heat water at a flow rate of 1.5 kg/s from 30 to 120 C. The overall heat transfer coefficient based on the water-side surface area is U = 220 W/m2 . K. Determine : a) the required water surface area Ac using the NTU method(let effectiveness €=0.65). b) Ac when we change the water outlet temperature to 130C c) discuss the effect of changing the water outlet temperature to Ac? d)draw the temperature profile along the heat exchanger
Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
Hot oil, which enter a cross-flow heat exchanger at 200 C and
leave at 100 C, are used to heat water at a flow rate of 1.5 kg/s
from 30 to 120 C. The overall heat transfer coefficient based on
the water-side surface area is U = 220 W/m2 . K.
Determine :
a) the required water surface area Ac using the NTU method(let
effectiveness €=0.65).
b) Ac when we change the water outlet temperature to 130C
c) discuss the effect of changing the water outlet temperature to
Ac?
d)draw the temperature profile along the heat exchanger
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