Nanofiltration (NF) Engineering
NF sits between UF and RO: it removes dissolved species while passing much of the low-molecular-weight load. EngiMetric applies exact water and solute conservation to the recovery and rejection you supply, and never assumes either of them for you.
Choose a calculation below. Each one runs an EngiMetric NF engine and reports its own water- and solute-balance validation.
NF water and solute balance
EngiMetric engineEvery value below is produced by the registered EngiMetric engine for this calculation. The Copilot never supplies engineering values.
Inputs the engine needs, and why
- Feed flow (m³/h) — The balance is driven by the flow entering the NF stage.
- Feed TDS — Solute conservation needs the feed concentration.
- Recovery rate — NF recovery is a supplied design value, not an assumption.
- Salt rejection — NF rejection is membrane-specific and must be supplied; this engine never assumes it.
Calculation Details
- Engine
calculateNfBalance- Calculation ID
nf.balance- Outputs
- NF permeate flow (m³/h) · NF concentrate flow (m³/h) · Permeate TDS (mg/L) · Concentrate TDS (mg/L)
NF membrane area
EngiMetric engineEvery value below is produced by the registered EngiMetric engine for this calculation. The Copilot never supplies engineering values.
Inputs the engine needs, and why
- Feed flow (m³/h) — NF area is sized from the permeate flow the stage must produce.
- Design permeate flux — Membrane area is only defined against a flux basis, so the design flux must be supplied.
Calculation Details
- Engine
calculateNfMembraneArea- Calculation ID
nf.membrane_area- Outputs
- Design flux (LMH)