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.GIVENWater flowing through a thin copper tube in a roomWater temperature (Tb) = 80?CInside diameter of tube (D) = 15.2 cm = 0.152 cmWater velocity (V) = 7.6 m/sRoom air temperature (T??) = 15?COuter surface heat transfer coefficient (hco) = 14.1 W/(m2 K)ASSUMPTIONSSteady stateThermal resistance of the copper tube is negligibleFully developedflow

Transcribed Image Text:

T= 15°C Water T- 80°C V=7.6 m/s D= 15.2 cm