Water flows at 50°C inside a 2.5-cm-inside-diameter tube such that hi = 3500 W/m² .°C. The tube has a wall thickness of 0.8 mm with a thermal conductivity of 16 W/m -°C. The outside of the tube loses heat by free convection with ho =7.6 W/m2 .°C. Calculate the overall heat-transfer coefficient and heat loss per unit length to surrounding air at 20°C. %3D

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.