A stainless steel tube (k = 14,2 W / m.K) used to transport a chilled pharmaceutical has an inner diameter of 36 mm and a wall thickness of 2 mm. The pharmaceutical and ambient air are at temperatures of 6∘C and 23∘C, respectively, while the corresponding inner and outer convection coefficients are 400 W / (m2.K) e 6 W / (m2.K), respectively. a) Sketch and explain in detail the heat download process in the above situation. (b) What is the heat gain per unit tube length? (c) What is the heat gain per unit length if a 20-mm-thick layer of calcium silicate insulation (kins=0.050W/m⋅K) is placed on the outer surface of the tube?

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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.