方法
入力された工程分配、除去、添加、および同一工程または上流工程への返送を用いて、宣言された定常水量・成分収支を解きます。水量と成分の閉合誤差を明示して報告し、閉合を強制するための正規化は行いません。
The steady-state water network is written as F = b + A F and solved with deterministic pivoted Gauss-Jordan elimination.
Each process forwards its declared fraction of inlet flow to the next process. At the final process, forward flow is the final product stream.
The remainder is the waste-side flow. The entered recycle fraction applies to this waste split and returns only to the same process or an upstream process.
Constituent mass flow is water flow multiplied by concentration with unit conversion. At each node, removal is applied to inlet constituent mass, then the entered addition is applied, then the outlet constituent mass is split using the water-flow fractions.
Accumulation is assumed to be zero at steady state. Water and constituent closure errors are reported separately. Errors within the documented tolerance are reported as zero; the flows and masses are not normalized to force closure.
Water closure tolerance is max(1e-8 m³/d, external feed × 1e-10); constituent mass tolerance is max(1e-8 kg/d, (external mass + entered additions) × 1e-10).