Rework problem X3-1 if the heat exchanger is redesigned to have the hot water enter the heat exchanger at 60 C (answers:4 and 3.
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# />The first question asking to rework the problem with the heat exchanger being redesigned to have the hot water enter the heat exchanger at 60C is where I'm stuck at. The second picture is the original problem it is asking to be reworked. Attachment 1 Attachment 2 ATTACHMENT PREVIEW Download attachment attachment_10012019.png Rework problem X3-1 if the heat exchanger is redesigned to have the hot water enter the heat exchanger at 60 C (answers: 27.4 and 3.1 m). ATTACHMENT PREVIEW Download attachment attachment_10012019.png 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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