A liquid is to be cooled from 60 oC to 20 oC using water entering countercurrent at 15 oC and leaving at 25 oC in a double pipe heat exchanger composed of ¾” Sch. 40 and 1.5” Sch. 40 steel pipes. Entering velocity of liquid is 1.5 m/s.  ho = 5000 W/m2-K; hi = 1500 W/m2-K; k of pipe = 44 W/m-K. Determine the overall heat transfer coefficient Ui in W/m2-K.

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