Problem 3.2 The volume flowrate of 25 L/min of water at 60 °C flows inside a steel (k=36 W/(m.°C)) horizontal duct with 15 mm internal diameter and 2.5 mm thickness. Evaluate the heat locally lost by the water to the ambient air if: a) Air is quiescent, at 10 °C; b) Air, at 10 °C, flows perpendicularly to the horizontal duct with a velocity of 5 m/s.

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Chapter1: Marketing: Creating Customer Value And Engagement
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Problem 3.2
The volume flowrate of 25 L/min of water at 60 °C flows inside a steel (k=36 W/(m.°C)) horizontal duct with 15 mm internal
diameter and 2.5 mm thickness.
Evaluate the heat locally lost by the water to the ambient air if:
a) Air is quiescent, at 10 °C;
b) Air, at 10 °C, flows perpendicularly to the horizontal duct with a velocity of 5 m/s.
Transcribed Image Text:Problem 3.2 The volume flowrate of 25 L/min of water at 60 °C flows inside a steel (k=36 W/(m.°C)) horizontal duct with 15 mm internal diameter and 2.5 mm thickness. Evaluate the heat locally lost by the water to the ambient air if: a) Air is quiescent, at 10 °C; b) Air, at 10 °C, flows perpendicularly to the horizontal duct with a velocity of 5 m/s.
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