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(Solution) - Water at 80 C is flowing through a thin copper tube

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Water at 80°C is flowing through a thin copper tube (15.2 cm ID) at a velocity of 7.6 m/s. The duct is located in a room at 15°C and the heat transfer coefficient at the outer surface of the duct is 14.1 W/(m2 K). (a) Determine the heat transfer coefficient at the inner surface. (b) Estimate the length of duct in which the water temperature drops 1°C.
Water flowing through a thin copper tube in a room
Water temperature (Tb) = 80°C
Inside diameter of tube (D) = 15.2 cm = 0.152 cm
Water velocity (V) = 7.6 m/s
Room air temperature (T?) = 15°C
Outer surface heat transfer coefficient (hco) = 14.1 W/(m2 K)
Steady state
Thermal resistance of the copper tube is negligible
Fully developedflow


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