where q Syn " 1 and n H 2 ,t and n CO,t are the total molar amount of H The effective area of one electrolyzer cell is assumed to be 2.7 m 2 , which is the size of the typical chlor-alkali electrolyzer cell . The syngas storage is capable of supplying syngas to a downstream for maximum of six hours (C Syn ). We derive the cubic polynomial functions f FE s,c,t and f U-j s,t as the surrogate functions of FE s,c,t j s,t (effective current density) in (1) and U s,t j s,t (power density) in ( ) as follows: