Question #3: A storage tank consists of a cylindrical section that has a length and inner diameter of L= 2 m and D; = 1 m, respectively, and two hemispherical end sections. The tank is constructed from 20-mm- thick glass (pyrex) and is exposed to ambient air for which the temperature is 300 K and the convection coefficient is 10 W/m² .K. The tank is used to store heated oil, with a temperature of 400 K and a convection coefficient 5 W/m².K. Determine the heat flow rate through the walls. Radiation effects may be neglected, and the pyrex may be assumed to have a thermal conductivity of 1.4 W/m .K. D₁

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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.