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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 double-pipe heat exchanger must be designed to evaporate 2.5kgs of water at 120C. The heating is to be accomplished by passing hot oil, available at 180C, through the inner pipe of the heat exchanger. The convective heat transfer coefficient on the evaporation side (in the annulus) is h0=105Wm-2K-1. The inner pipe is a 5-cm thin-walled.
(a) Compute the oil flow rate if the oil leaves the exchanger at 140C.(2 points)
(b) Calculate the required area of heat transfer. (5 points)
Suppose that after a long operating time, the fouling factor is 10-4Km2W. Given the same design flowrate of oil calculated in (a) and oil inlet temperature (180C),
(c) Evaluate the new oil leaving temperature. (3 point)
Please use the following thermo-physical properties:
For the oil, at 160C,=806kgm-3,lonp=2.471kJkg-1K-1,=2.410-4Pas,k=0.132Wm-1K-1, and Pr=4:5.
For water/steam, the latent heat of vaporisation at 120C is 2203kJkg
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