The quantity \ct{'WALL ENTHALPY'} is the total energy within the volume carved out by a wall cell from front to back. This is why the \ct{IOR} is included because the integration need only be carried out for upward facing wall cells. Also, because the unit associated with this quantity is kJ rather than kJ/m$^2$, the \ct{CONVERSION_FACTOR} is needed to cancel out the area of each wall cell (0.01~m by 0.01~m) after the summation. The parameter \ct{RELATIVE=T} means that only the change in enthalpy is desired.
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