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A double - pipe heat exchanger must be designed to evaporate 2 . 5 k g s of water at 1 2 0 C .
A doublepipe heat exchanger must be designed to evaporate of water at The heating is to be accomplished by passing hot oil, available at through the inner pipe of the heat exchanger. The convective heat transfer coefficient on the evaporation side in the annulus is The inner pipe is a thinwalled.
a Compute the oil flow rate if the oil leaves the exchanger at points
b Calculate the required area of heat transfer. points
Suppose that after a long operating time, the fouling factor is Given the same design flowrate of oil calculated in a and oil inlet temperature
c Evaluate the new oil leaving temperature. point
Please use the following thermophysical properties:
For the oil, at Pas, and :
For watersteam the latent heat of vaporisation at is
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