Example (cont.)
If the mass flow rate of the oil is 2 kg/s and the specific heat of the oil is 2 kJ/kg.K, determine the temperature change in 1 m of pipe length.
Therefore, the total temperature variation can be significant if the pipe is very long. For example, 45?C for every 1 km of pipe length.
- Heating might be needed to prevent the oil from freezing up.
- The heat transfer can not be considered constant for a long pipe
Heat transfer to the ground (q)