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A single-pass parallel flow heat exchanger will be used to heat a 0.50 kg/s stream of air from 20'C to 35.C. The air will be heated with a 0.25 kg/s stream of hot water that flows in the inside tube. UP=90 W/m . K for the heat transfer from the water to the air. The hot water will enter the heat exchanger at 50 C. a) Find the LMTD (answer: 16.5). b) Find the tube length needed for the heat transfer (answer: 5.1 m).
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