Local heat changes during aluminium elec

Local heat effects caused by electric current in the industrial electrolysis of aluminium are calculated using a non-equilibrium theory known as the electric work method. This study aims to quantify local heat changes connected to the electric current in aluminium electrolysis, taking into account factors such as electrode overpotentials, ohmic resistance, and the reactions at each electrode. By utilizing literature data and making necessary assumptions about the electrode reactions, the results indicate that for a current density of 0.7 A cm-2, the reversible heat production at the cathode surface is 0.1 W cm-2, while the irreversible heating due to overpotential reaches 0.07 W cm-2. Conversely, the anode experiences a reversible cooling of -0.63 W cm-2 alongside a heating of 0.3 W cm-2 caused by overpotential. Additionally, Joule heating of the electrolyte is approximated at 0.2 W cm-3. The findings suggest significant asymmetry in heat production and temperature gradients across the cell, emphasizing the importance of accurate modeling for optimal cell design and better understanding of heat transfer mechanisms in the aluminium electrolysis process.