A pipe is used to transport refrigerant R-134a with an inner radius of 0.03m, outer radius of 5 cm, and thermal conductivity of k=2.5 W/m-K. The inner and outer surfaces of the pipe are maintained at an average temperature of 20°C and 40°C, respectively.   Obtain a general relation for the temperature distribution inside the pipe under steady conditions.   Determine the rate of heat gain per unit length by the refrigerant through the pipe.

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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.