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40 C.F.R. § 98.63

Calculating GHG emissions.

§ 98.63 Calculating GHG emissions.

(a) The annual value of each PFC compound (CF4, C2F6) shall be estimated from the sum of monthly values using Equation F-1 of this section:

er30oc09.025.gif

Where:

EPFC = Annual emissions of each PFC compound from aluminum production (metric tons PFC). Em = Emissions of the individual PFC compound from aluminum production for the month “m” (metric tons PFC).

(b) Use Equation F-2 of this section to estimate CF4 emissions from anode effect duration or Equation F-3 of this section to estimate CF4 emissions from overvoltage, and use Equation F-4 of this section to estimate C2F6 emissions from anode effects from each prebake and Søderberg electrolysis cell.

er30oc09.026.gif

Where:

ECF4 = Monthly CF4 emissions from aluminum production (metric tons CF4). SCF4 = The slope coefficient ((kg CF4/metric ton Al)/(AE-Mins/cell-day)). AEM = The anode effect minutes per cell-day (AE-Mins/cell-day). MP = Metal production (metric tons Al), where AEM and MP are calculated monthly.
er30oc09.027.gif

Where:

ECF4 = Monthly CF4 emissions from aluminum production (metric tons CF4). EFCF4 = The overvoltage emission factor (kg CF4/metric ton Al). MP = Metal production (metric tons Al), where MP is calculated monthly.
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