In a manufacturing process a thin rectangular part that has a surface area of 30 cm × 30 cm and a mass of 3750 g and is initially at 498 K. The part is left to cool in ambient at room temperature (T¥=Tsurr=25 °C) with a convection heat transfer coefficient of 6.40 W/m2·K. The part can be assumed to have a specific heat of 2.770 kJ/kg·K. If the surface emissivity is 0.42 what is the initial rate of change in temperature as the part cools in ambient? What is the initial rate of heat loss by radiation and convection? (Evaluate each separately).

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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.