The cell efficiency calculated in this study is a function of the
lower heating value (LHV) of the consumed hydrogen and total
power output as shown in Eq. (26), whereas the system efficiency
(gsys) is the net energy output of the system obtained by subtracting
the electrical energy demand for auxiliary units (such as pumps
and compressors) from the power generation, which is divided by
the lower heating value (LHV) of the methane fed to the fuel
processor