T_gas_in T "Temperature of inlet exhaust gas"
d_cat 0.32[m] "Monolith diameter"
l_SCR 0.4[m] "SCR monolith length"
l_ASC 0.06[m] "ASC monolith length"
V_SCR pi*(d_cat/2)^2*l_SCR "SCR monolith volume"
V_ASC pi*(d_cat/2)^2*l_ASC "ASC monolith volume"