Engineering, 28.11.2019 05:31 lexizamora2

Oil in an engine is being cooled by air in a cross-flow heat exchanger, where both fluids are unmixed. oil (cp = 2000 j/kg. k) flowing with a flow rate of 0.020 kg/s enters the heat exchanger at 75°c, while air (cp = 1000 j/kg. k) enters at 30°c with a flow rate of 0.20 kg/s. the overall heat transfer coefficient of the heat exchanger is 50 w/m2 . k and the total surface area is 1 m2 . determine: (a) the heat transfer effectiveness and (15 points) (b) the outlet temperature of the oil. (use the effectiveness-ntu method) (15 points)

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