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5. A heat exchanger has been designed based on calculated Uc (clean H.T coefficient) equal to 50h.ft2.FBTU and a dirt/fouling factor of 0.005BTVhft2.%. Do you think that the exchanger will have an "apparent overdesign" (i.e., the initial area will be different from the final area once the HX is fouled) for some period after installation? What is the apparent \% excess area at the start, assuming no change in