What is the outside foam surface


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Q: Liquid water at 80oC flows with 0.2 kg/s inside a square duct, side 2 cm insulated with a 1 cm thick layer of foam k = 0.1 W/m K. If the outside foam surface is at 25oC how much has the water temperature dropped for 10 m length of duct? Neglect the duct material and any corner effects (A = 4sL).

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Mechanical Engineering: What is the outside foam surface
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